14.2. configparser — 設定ファイルのパーサー

このモジュールは、 Microsoft Windows の INI ファイルに似た構造を持ったベーシックな設定用言語を実装した ConfigParser クラスを提供します。 このクラスを使ってユーザーが簡単にカスタマイズできる Python プログラムを作ることができます。

注釈

このライブラリでは、Windowsのレジストリ用に拡張された INI 文法はサポート していません

参考

shlex モジュール

アプリケーション用の設定ファイルフォーマットとして使える、 Unix シェルライクなミニ言語の作成を支援します。

json モジュール

jsom モジュールは、同じ目的に利用できる JavaScript の文法のサブセットを実装しています。

14.2.1. クイックスタート

次のような、非常に簡単な設定ファイルを例に考えましょう:

[DEFAULT]
ServerAliveInterval = 45
Compression = yes
CompressionLevel = 9
ForwardX11 = yes

[bitbucket.org]
User = hg

[topsecret.server.com]
Port = 50022
ForwardX11 = no

INI ファイルの構造は 下のセクション で解説します。 基本的に、ファイルは複数のセクションからなり、各セクションは複数のキーと値を持ちます。 configparser のクラス群はそれらのファイルを読み書きできます。 まずは上のような設定ファイルをプログラムから作成してみましょう。

>>> import configparser
>>> config = configparser.ConfigParser()
>>> config['DEFAULT'] = {'ServerAliveInterval': '45',
...                      'Compression': 'yes',
...                      'CompressionLevel': '9'}
>>> config['bitbucket.org'] = {}
>>> config['bitbucket.org']['User'] = 'hg'
>>> config['topsecret.server.com'] = {}
>>> topsecret = config['topsecret.server.com']
>>> topsecret['Port'] = '50022'     # mutates the parser
>>> topsecret['ForwardX11'] = 'no'  # same here
>>> config['DEFAULT']['ForwardX11'] = 'yes'
>>> with open('example.ini', 'w') as configfile:
...   config.write(configfile)
...

この例でわかるように、 config parser は辞書のように扱うことができます。 辞書との違いは 後に 説明しますが、 このインターフェイスは辞書に対して期待するのととても近い動作をします。

これで設定ファイルを作成して保存できました。 次はこれを読み込み直して、中のデータを取り出してみましょう。

>>> import configparser
>>> config = configparser.ConfigParser()
>>> config.sections()
[]
>>> config.read('example.ini')
['example.ini']
>>> config.sections()
['bitbucket.org', 'topsecret.server.com']
>>> 'bitbucket.org' in config
True
>>> 'bytebong.com' in config
False
>>> config['bitbucket.org']['User']
'hg'
>>> config['DEFAULT']['Compression']
'yes'
>>> topsecret = config['topsecret.server.com']
>>> topsecret['ForwardX11']
'no'
>>> topsecret['Port']
'50022'
>>> for key in config['bitbucket.org']: print(key)
...
user
compressionlevel
serveraliveinterval
compression
forwardx11
>>> config['bitbucket.org']['ForwardX11']
'yes'

上の例からわかるように、 API はとても直感的です。 唯一の魔術は、 DEFAULT セクションが他の全てのセクションのためのデフォルト値を提供していることです。 [1] また、セクション内の各キーは大文字小文字を区別せず、全て小文字で保存されていることにも注意してください。 [1]

14.2.2. サポートされるデータ型

Config parser は値のデータ型について何も推論せず、常に文字列のまま内部に保存します。 他のデータ型が必要な場合は自分で変換する必要があります。

>>> int(topsecret['Port'])
50022
>>> float(topsecret['CompressionLevel'])
9.0

真偽値の扱いはシンプルではありません。 文字列を bool() に渡しても、 bool('False')True になってしまいます。 そこで config parser は getboolean() を提供しています。 このメソッドは大文字小文字を区別せず、 'yes'/'no', 'on'/'off', '1'/'0' を真偽値として認識します [1]. 例えば:

>>> topsecret.getboolean('ForwardX11')
False
>>> config['bitbucket.org'].getboolean('ForwardX11')
True
>>> config.getboolean('bitbucket.org', 'Compression')
True

config parser は getboolean() の他に、 getint()getfloat() メソッドを提供しています。 ただしこれらは int()float() の変換で充分なので getboolean() ほど有用ではありません。

14.2.3. 代替値

辞書と同じように、セクションの get() メソッドは代替値を提供しています:

>>> topsecret.get('Port')
'50022'
>>> topsecret.get('CompressionLevel')
'9'
>>> topsecret.get('Cipher')
>>> topsecret.get('Cipher', '3des-cbc')
'3des-cbc'

デフォルト値は代替値よりも優先されることに注意してください。 例えば上の例では、 'CompressionLevel' キーは 'DEFAUT' セクションにしか存在しません。 その値を 'topsecret.server.com' から取得しようとした場合、代替値を指定しても常にデフォルト値を返します:

>>> topsecret.get('CompressionLevel', '3')
'9'

もう一つ注意すべき点は、パーサーレベルの(訳注: ConfigParserクラスの) get() メソッドは、後方互換性のために、カスタムのより複雑なインターフェースを提供します。 このメソッドを使用する際には、フォールバック値はキーワード引数としてのみ指定できる fallback 引数を介して提供されます。

>>> config.get('bitbucket.org', 'monster',
...            fallback='No such things as monsters')
'No such things as monsters'

同様の fallback 引数を、getint()getfloat() と meth:getboolean メソッドでも使えます。例:

>>> 'BatchMode' in topsecret
False
>>> topsecret.getboolean('BatchMode', fallback=True)
True
>>> config['DEFAULT']['BatchMode'] = 'no'
>>> topsecret.getboolean('BatchMode', fallback=True)
False

14.2.4. サポートするINI ファイルの構造

設定ファイルは複数のセクションから構成されます。セクションは、 [section] ヘッダに続いた、特定の文字列(デフォルトでは = または : [1] )で区切られたキーと値のエントリです。 デフォルトでは、セクション名は大文字と小文字を区別しますが、キーはそうではありません [1] 。 キーと値、それぞれの先頭と末尾の空白は取り除かれます。値は省略することができ、その際でも、キーと値の区切り文字は残しておけます。 値はまた、値の先頭の行より深くインデントされていれば、複数の行にまたがっても構いません。 パーサーのモードによって、空白行は、複数行からなる値の一部として扱われるか、無視されます。

Configuration files may include comments, prefixed by specific characters (# and ; by default [1]). Comments may appear on their own on an otherwise empty line, possibly indented. [1]

例えば:

[Simple Values]
key=value
spaces in keys=allowed
spaces in values=allowed as well
spaces around the delimiter = obviously
you can also use : to delimit keys from values

[All Values Are Strings]
values like this: 1000000
or this: 3.14159265359
are they treated as numbers? : no
integers, floats and booleans are held as: strings
can use the API to get converted values directly: true

[Multiline Values]
chorus: I'm a lumberjack, and I'm okay
    I sleep all night and I work all day

[No Values]
key_without_value
empty string value here =

[You can use comments]
# like this
; or this

# By default only in an empty line.
# Inline comments can be harmful because they prevent users
# from using the delimiting characters as parts of values.
# That being said, this can be customized.

    [Sections Can Be Indented]
        can_values_be_as_well = True
        does_that_mean_anything_special = False
        purpose = formatting for readability
        multiline_values = are
            handled just fine as
            long as they are indented
            deeper than the first line
            of a value
        # Did I mention we can indent comments, too?

14.2.5. 値の内挿

コア機能に加えて、 ConfigParser は内挿(interpolation)をサポートします。これは get() コールが値を返す前に、その値に対して前処理を行えることを意味します。

class configparser.BasicInterpolation

ConfigParser が使用するデフォルト実装です。 値に、同じセクションか特別なデフォルトセクション中 [1] の他の値を参照するフォーマット文字列を含めることができます。 追加のデフォルト値を初期化時に提供できます。

例えば:

[Paths]
home_dir: /Users
my_dir: %(home_dir)s/lumberjack
my_pictures: %(my_dir)s/Pictures

上の例では、 interpolationBasicInterpolation() を設定した ConfigParser%(home_dir)shome_dir の値(このケースでは /Users )として解決しています、その結果 %(my_dir)s/Users/lumberjack になります。全ての内挿は 必要に応じて実行されるため、設定ファイル中で参照の連鎖をもつキーを特定の順序で記述する必要はありません。

interpolationNone を設定すれば、 パーサーは単に my_pictures の値として %(my_dir)s/Pictures を返し、 my_dir の値として %(home_dir)s/lumberjack を返します。

class configparser.ExtendedInterpolation

zc.buildout で使用されるような、より高度な文法を実装した内挿ハンドラの選択肢です。 拡張された内挿は、他のセクション中の値を示すのに ${section:option} と書けます。 内挿は複数のレベルに及べます、利便性のために、 もし section: の部分が省略されると、現在のセクションがデフォルト値となります(スペシャルセクション中のデフォルト値を使用することもできます)。

たとえば、上記のbasic interpolation で指定した設定は、extended interpolationを使うと下記のようになります。

[Paths]
home_dir: /Users
my_dir: ${home_dir}/lumberjack
my_pictures: ${my_dir}/Pictures

他のセクションから値を持ってくる例です :

[Common]
home_dir: /Users
library_dir: /Library
system_dir: /System
macports_dir: /opt/local

[Frameworks]
Python: 3.2
path: ${Common:system_dir}/Library/Frameworks/

[Arthur]
nickname: Two Sheds
last_name: Jackson
my_dir: ${Common:home_dir}/twosheds
my_pictures: ${my_dir}/Pictures
python_dir: ${Frameworks:path}/Python/Versions/${Frameworks:Python}

14.2.6. Mapping Protocol Access

バージョン 3.2 で追加.

Mapping protocol access is a generic name for functionality that enables using custom objects as if they were dictionaries. In case of configparser, the mapping interface implementation is using the parser['section']['option'] notation.

parser['section'] in particular returns a proxy for the section’s data in the parser. This means that the values are not copied but they are taken from the original parser on demand. What’s even more important is that when values are changed on a section proxy, they are actually mutated in the original parser.

configparser objects behave as close to actual dictionaries as possible. The mapping interface is complete and adheres to the MutableMapping ABC. However, there are a few differences that should be taken into account:

  • By default, all keys in sections are accessible in a case-insensitive manner [1]. E.g. for option in parser["section"] yields only optionxform‘ed option key names. This means lowercased keys by default. At the same time, for a section that holds the key 'a', both expressions return True:

    "a" in parser["section"]
    "A" in parser["section"]
    
  • All sections include DEFAULTSECT values as well which means that .clear() on a section may not leave the section visibly empty. This is because default values cannot be deleted from the section (because technically they are not there). If they are overriden in the section, deleting causes the default value to be visible again. Trying to delete a default value causes a KeyError.

  • DEFAULTSECT cannot be removed from the parser:

    • trying to delete it raises ValueError,
    • parser.clear() leaves it intact,
    • parser.popitem() never returns it.
  • parser.get(section, option, **kwargs) - the second argument is not a fallback value. Note however that the section-level get() methods are compatible both with the mapping protocol and the classic configparser API.

  • parser.items() is compatible with the mapping protocol (returns a list of section_name, section_proxy pairs including the DEFAULTSECT). However, this method can also be invoked with arguments: parser.items(section, raw, vars). The latter call returns a list of option, value pairs for a specified section, with all interpolations expanded (unless raw=True is provided).

The mapping protocol is implemented on top of the existing legacy API so that subclasses overriding the original interface still should have mappings working as expected.

14.2.7. Customizing Parser Behaviour

There are nearly as many INI format variants as there are applications using it. configparser goes a long way to provide support for the largest sensible set of INI styles available. The default functionality is mainly dictated by historical background and it’s very likely that you will want to customize some of the features.

The most common way to change the way a specific config parser works is to use the __init__() options:

  • defaults, デフォルト値: None

    This option accepts a dictionary of key-value pairs which will be initially put in the DEFAULT section. This makes for an elegant way to support concise configuration files that don’t specify values which are the same as the documented default.

    Hint: if you want to specify default values for a specific section, use read_dict() before you read the actual file.

  • dict_type, デフォルト値: collections.OrderedDict

    This option has a major impact on how the mapping protocol will behave and how the written configuration files look. With the default ordered dictionary, every section is stored in the order they were added to the parser. Same goes for options within sections.

    An alternative dictionary type can be used for example to sort sections and options on write-back. You can also use a regular dictionary for performance reasons.

    Please note: there are ways to add a set of key-value pairs in a single operation. When you use a regular dictionary in those operations, the order of the keys may be random. For example:

    >>> parser = configparser.ConfigParser()
    >>> parser.read_dict({'section1': {'key1': 'value1',
    ...                                'key2': 'value2',
    ...                                'key3': 'value3'},
    ...                   'section2': {'keyA': 'valueA',
    ...                                'keyB': 'valueB',
    ...                                'keyC': 'valueC'},
    ...                   'section3': {'foo': 'x',
    ...                                'bar': 'y',
    ...                                'baz': 'z'}
    ... })
    >>> parser.sections()
    ['section3', 'section2', 'section1']
    >>> [option for option in parser['section3']]
    ['baz', 'foo', 'bar']
    

    In these operations you need to use an ordered dictionary as well:

    >>> from collections import OrderedDict
    >>> parser = configparser.ConfigParser()
    >>> parser.read_dict(
    ...   OrderedDict((
    ...     ('s1',
    ...      OrderedDict((
    ...        ('1', '2'),
    ...        ('3', '4'),
    ...        ('5', '6'),
    ...      ))
    ...     ),
    ...     ('s2',
    ...      OrderedDict((
    ...        ('a', 'b'),
    ...        ('c', 'd'),
    ...        ('e', 'f'),
    ...      ))
    ...     ),
    ...   ))
    ... )
    >>> parser.sections()
    ['s1', 's2']
    >>> [option for option in parser['s1']]
    ['1', '3', '5']
    >>> [option for option in parser['s2'].values()]
    ['b', 'd', 'f']
    
  • allow_no_value, デフォルト値: False

    Some configuration files are known to include settings without values, but which otherwise conform to the syntax supported by configparser. The allow_no_value parameter to the constructor can be used to indicate that such values should be accepted:

    >>> import configparser
    
    >>> sample_config = """
    ... [mysqld]
    ...   user = mysql
    ...   pid-file = /var/run/mysqld/mysqld.pid
    ...   skip-external-locking
    ...   old_passwords = 1
    ...   skip-bdb
    ...   # we don't need ACID today
    ...   skip-innodb
    ... """
    >>> config = configparser.ConfigParser(allow_no_value=True)
    >>> config.read_string(sample_config)
    
    >>> # Settings with values are treated as before:
    >>> config["mysqld"]["user"]
    'mysql'
    
    >>> # Settings without values provide None:
    >>> config["mysqld"]["skip-bdb"]
    
    >>> # Settings which aren't specified still raise an error:
    >>> config["mysqld"]["does-not-exist"]
    Traceback (most recent call last):
      ...
    KeyError: 'does-not-exist'
    
  • delimiters, デフォルト値: ('=', ':')

    Delimiters are substrings that delimit keys from values within a section. The first occurrence of a delimiting substring on a line is considered a delimiter. This means values (but not keys) can contain the delimiters.

    See also the space_around_delimiters argument to ConfigParser.write().

  • comment_prefixes, デフォルト値: ('#', ';')

  • inline_comment_prefixes, デフォルト値: None

    Comment prefixes are strings that indicate the start of a valid comment within a config file. comment_prefixes are used only on otherwise empty lines (optionally indented) whereas inline_comment_prefixes can be used after every valid value (e.g. section names, options and empty lines as well). By default inline comments are disabled and '#' and ';' are used as prefixes for whole line comments.

    バージョン 3.2 で変更: In previous versions of configparser behaviour matched comment_prefixes=('#',';') and inline_comment_prefixes=(';',).

    Please note that config parsers don’t support escaping of comment prefixes so using inline_comment_prefixes may prevent users from specifying option values with characters used as comment prefixes. When in doubt, avoid setting inline_comment_prefixes. In any circumstances, the only way of storing comment prefix characters at the beginning of a line in multiline values is to interpolate the prefix, for example:

    >>> from configparser import ConfigParser, ExtendedInterpolation
    >>> parser = ConfigParser(interpolation=ExtendedInterpolation())
    >>> # the default BasicInterpolation could be used as well
    >>> parser.read_string("""
    ... [DEFAULT]
    ... hash = #
    ...
    ... [hashes]
    ... shebang =
    ...   ${hash}!/usr/bin/env python
    ...   ${hash} -*- coding: utf-8 -*-
    ...
    ... extensions =
    ...   enabled_extension
    ...   another_extension
    ...   #disabled_by_comment
    ...   yet_another_extension
    ...
    ... interpolation not necessary = if # is not at line start
    ... even in multiline values = line #1
    ...   line #2
    ...   line #3
    ... """)
    >>> print(parser['hashes']['shebang'])
    
    #!/usr/bin/env python
    # -*- coding: utf-8 -*-
    >>> print(parser['hashes']['extensions'])
    
    enabled_extension
    another_extension
    yet_another_extension
    >>> print(parser['hashes']['interpolation not necessary'])
    if # is not at line start
    >>> print(parser['hashes']['even in multiline values'])
    line #1
    line #2
    line #3
    
  • strict, デフォルト値: True

    When set to True, the parser will not allow for any section or option duplicates while reading from a single source (using read_file(), read_string() or read_dict()). It is recommended to use strict parsers in new applications.

    バージョン 3.2 で変更: In previous versions of configparser behaviour matched strict=False.

  • empty_lines_in_values, デフォルト値: True

    In config parsers, values can span multiple lines as long as they are indented more than the key that holds them. By default parsers also let empty lines to be parts of values. At the same time, keys can be arbitrarily indented themselves to improve readability. In consequence, when configuration files get big and complex, it is easy for the user to lose track of the file structure. Take for instance:

    [Section]
    key = multiline
      value with a gotcha
    
     this = is still a part of the multiline value of 'key'
    

    This can be especially problematic for the user to see if she’s using a proportional font to edit the file. That is why when your application does not need values with empty lines, you should consider disallowing them. This will make empty lines split keys every time. In the example above, it would produce two keys, key and this.

  • default_section, デフォルト値: configparser.DEFAULTSECT (すなわち: "DEFAULT")

    The convention of allowing a special section of default values for other sections or interpolation purposes is a powerful concept of this library, letting users create complex declarative configurations. This section is normally called "DEFAULT" but this can be customized to point to any other valid section name. Some typical values include: "general" or "common". The name provided is used for recognizing default sections when reading from any source and is used when writing configuration back to a file. Its current value can be retrieved using the parser_instance.default_section attribute and may be modified at runtime (i.e. to convert files from one format to another).

  • interpolation, デフォルト値: configparser.BasicInterpolation

    Interpolation behaviour may be customized by providing a custom handler through the interpolation argument. None can be used to turn off interpolation completely, ExtendedInterpolation() provides a more advanced variant inspired by zc.buildout. More on the subject in the dedicated documentation section. RawConfigParser has a default value of None.

More advanced customization may be achieved by overriding default values of these parser attributes. The defaults are defined on the classes, so they may be overriden by subclasses or by attribute assignment.

configparser.BOOLEAN_STATES

By default when using getboolean(), config parsers consider the following values True: '1', 'yes', 'true', 'on' and the following values False: '0', 'no', 'false', 'off'. You can override this by specifying a custom dictionary of strings and their Boolean outcomes. For example:

>>> custom = configparser.ConfigParser()
>>> custom['section1'] = {'funky': 'nope'}
>>> custom['section1'].getboolean('funky')
Traceback (most recent call last):
...
ValueError: Not a boolean: nope
>>> custom.BOOLEAN_STATES = {'sure': True, 'nope': False}
>>> custom['section1'].getboolean('funky')
False

Other typical Boolean pairs include accept/reject or enabled/disabled.

configparser.optionxform(option)

This method transforms option names on every read, get, or set operation. The default converts the name to lowercase. This also means that when a configuration file gets written, all keys will be lowercase. Override this method if that’s unsuitable. For example:

>>> config = """
... [Section1]
... Key = Value
...
... [Section2]
... AnotherKey = Value
... """
>>> typical = configparser.ConfigParser()
>>> typical.read_string(config)
>>> list(typical['Section1'].keys())
['key']
>>> list(typical['Section2'].keys())
['anotherkey']
>>> custom = configparser.RawConfigParser()
>>> custom.optionxform = lambda option: option
>>> custom.read_string(config)
>>> list(custom['Section1'].keys())
['Key']
>>> list(custom['Section2'].keys())
['AnotherKey']
configparser.SECTCRE

A compiled regular expression used to parse section headers. The default matches [section] to the name "section". Whitespace is considered part of the section name, thus [  larch  ] will be read as a section of name "  larch  ". Override this attribute if that’s unsuitable. For example:

>>> config = """
... [Section 1]
... option = value
...
... [  Section 2  ]
... another = val
... """
>>> typical = ConfigParser()
>>> typical.read_string(config)
>>> typical.sections()
['Section 1', '  Section 2  ']
>>> custom = ConfigParser()
>>> custom.SECTCRE = re.compile(r"\[ *(?P<header>[^]]+?) *\]")
>>> custom.read_string(config)
>>> custom.sections()
['Section 1', 'Section 2']

注釈

While ConfigParser objects also use an OPTCRE attribute for recognizing option lines, it’s not recommended to override it because that would interfere with constructor options allow_no_value and delimiters.

14.2.8. Legacy API Examples

Mainly because of backwards compatibility concerns, configparser provides also a legacy API with explicit get/set methods. While there are valid use cases for the methods outlined below, mapping protocol access is preferred for new projects. The legacy API is at times more advanced, low-level and downright counterintuitive.

configurationファイルを書き出す例:

import configparser

config = configparser.RawConfigParser()

# Please note that using RawConfigParser's set functions, you can assign
# non-string values to keys internally, but will receive an error when
# attempting to write to a file or when you get it in non-raw mode. Setting
# values using the mapping protocol or ConfigParser's set() does not allow
# such assignments to take place.
config.add_section('Section1')
config.set('Section1', 'an_int', '15')
config.set('Section1', 'a_bool', 'true')
config.set('Section1', 'a_float', '3.1415')
config.set('Section1', 'baz', 'fun')
config.set('Section1', 'bar', 'Python')
config.set('Section1', 'foo', '%(bar)s is %(baz)s!')

# Writing our configuration file to 'example.cfg'
with open('example.cfg', 'w') as configfile:
    config.write(configfile)

configurationファイルを読み込む例:

import configparser

config = configparser.RawConfigParser()
config.read('example.cfg')

# getfloat() raises an exception if the value is not a float
# getint() and getboolean() also do this for their respective types
a_float = config.getfloat('Section1', 'a_float')
an_int = config.getint('Section1', 'an_int')
print(a_float + an_int)

# Notice that the next output does not interpolate '%(bar)s' or '%(baz)s'.
# This is because we are using a RawConfigParser().
if config.getboolean('Section1', 'a_bool'):
    print(config.get('Section1', 'foo'))

To get interpolation, use ConfigParser:

import configparser

cfg = configparser.ConfigParser()
cfg.read('example.cfg')

# Set the optional *raw* argument of get() to True if you wish to disable
# interpolation in a single get operation.
print(cfg.get('Section1', 'foo', raw=False)) # -> "Python is fun!"
print(cfg.get('Section1', 'foo', raw=True))  # -> "%(bar)s is %(baz)s!"

# The optional *vars* argument is a dict with members that will take
# precedence in interpolation.
print(cfg.get('Section1', 'foo', vars={'bar': 'Documentation',
                                          'baz': 'evil'}))

# The optional *fallback* argument can be used to provide a fallback value
print(cfg.get('Section1', 'foo'))
      # -> "Python is fun!"

print(cfg.get('Section1', 'foo', fallback='Monty is not.'))
      # -> "Python is fun!"

print(cfg.get('Section1', 'monster', fallback='No such things as monsters.'))
      # -> "No such things as monsters."

# A bare print(cfg.get('Section1', 'monster')) would raise NoOptionError
# but we can also use:

print(cfg.get('Section1', 'monster', fallback=None))
      # -> None

Default values are available in both types of ConfigParsers. They are used in interpolation if an option used is not defined elsewhere.

import configparser

# New instance with 'bar' and 'baz' defaulting to 'Life' and 'hard' each
config = configparser.ConfigParser({'bar': 'Life', 'baz': 'hard'})
config.read('example.cfg')

print(config.get('Section1', 'foo')) # -> "Python is fun!"
config.remove_option('Section1', 'bar')
config.remove_option('Section1', 'baz')
print(config.get('Section1', 'foo')) # -> "Life is hard!"

14.2.9. ConfigParser オブジェクト

class configparser.ConfigParser(defaults=None, dict_type=collections.OrderedDict, allow_no_value=False, delimiters=('=', ':'), comment_prefixes=('#', ';'), inline_comment_prefixes=None, strict=True, empty_lines_in_values=True, default_section=configparser.DEFAULTSECT, interpolation=BasicInterpolation())

The main configuration parser. When defaults is given, it is initialized into the dictionary of intrinsic defaults. When dict_type is given, it will be used to create the dictionary objects for the list of sections, for the options within a section, and for the default values.

When delimiters is given, it is used as the set of substrings that divide keys from values. When comment_prefixes is given, it will be used as the set of substrings that prefix comments in otherwise empty lines. Comments can be indented. When inline_comment_prefixes is given, it will be used as the set of substrings that prefix comments in non-empty lines.

When strict is True (the default), the parser won’t allow for any section or option duplicates while reading from a single source (file, string or dictionary), raising DuplicateSectionError or DuplicateOptionError. When empty_lines_in_values is False (default: True), each empty line marks the end of an option. Otherwise, internal empty lines of a multiline option are kept as part of the value. When allow_no_value is True (default: False), options without values are accepted; the value held for these is None and they are serialized without the trailing delimiter.

When default_section is given, it specifies the name for the special section holding default values for other sections and interpolation purposes (normally named "DEFAULT"). This value can be retrieved and changed on runtime using the default_section instance attribute.

Interpolation behaviour may be customized by providing a custom handler through the interpolation argument. None can be used to turn off interpolation completely, ExtendedInterpolation() provides a more advanced variant inspired by zc.buildout. More on the subject in the dedicated documentation section.

All option names used in interpolation will be passed through the optionxform() method just like any other option name reference. For example, using the default implementation of optionxform() (which converts option names to lower case), the values foo %(bar)s and foo %(BAR)s are equivalent.

バージョン 3.1 で変更: The default dict_type is collections.OrderedDict.

バージョン 3.2 で変更: allow_no_value, delimiters, comment_prefixes, strict, empty_lines_in_values, default_section and interpolation were added.

defaults()

インスタンス全体で使われるデフォルト値の辞書を返します。

sections()

Return a list of the sections available; the default section is not included in the list.

add_section(section)

Add a section named section to the instance. If a section by the given name already exists, DuplicateSectionError is raised. If the default section name is passed, ValueError is raised. The name of the section must be a string; if not, TypeError is raised.

バージョン 3.2 で変更: Non-string section names raise TypeError.

has_section(section)

Indicates whether the named section is present in the configuration. The default section is not acknowledged.

options(section)

Return a list of options available in the specified section.

has_option(section, option)

If the given section exists, and contains the given option, return True; otherwise return False. If the specified section is None or an empty string, DEFAULT is assumed.

read(filenames, encoding=None)

ファイル名のリストを読んで解析をこころみ、うまく解析できたファイル名のリストを返します。 もし filenames が文字列なら、この引数は1つのファイル名として 扱われます。 filenames 中に開けないファイルがある場合、そのファイルは無視されます。この挙動は、設定ファイルが置かれる可能性のある場所(例えば、 カレントディレクトリ、ホームディレクトリ、システム全体の設定を行うディレクトリ)のリストを指定して、リストの中で存在する全ての設定ファイルを読むことを想定して設計されています。 どの設定ファイルも存在しなかった場合、 ConfigParser のインスタンスは 空のデータセットを持ちます。初期値の設定ファイルを先に読み込んでおく必要があるアプリケーションでは、 オプションのファイルを読み込むための read() を呼ぶ前に 、read_file() を用いて必要なファイルを読み込むでしょう

import configparser, os

config = configparser.ConfigParser()
config.read_file(open('defaults.cfg'))
config.read(['site.cfg', os.path.expanduser('~/.myapp.cfg')],
            encoding='cp1250')

バージョン 3.2 で追加: The encoding parameter. Previously, all files were read using the default encoding for open().

read_file(f, source=None)

Read and parse configuration data from f which must be an iterable yielding Unicode strings (for example files opened in text mode).

Optional argument source specifies the name of the file being read. If not given and f has a name attribute, that is used for source; the default is '<???>'.

バージョン 3.2 で追加: Replaces readfp().

read_string(string, source='<string>')

Parse configuration data from a string.

Optional argument source specifies a context-specific name of the string passed. If not given, '<string>' is used. This should commonly be a filesystem path or a URL.

バージョン 3.2 で追加.

read_dict(dictionary, source='<dict>')

Load configuration from any object that provides a dict-like items() method. Keys are section names, values are dictionaries with keys and values that should be present in the section. If the used dictionary type preserves order, sections and their keys will be added in order. Values are automatically converted to strings.

Optional argument source specifies a context-specific name of the dictionary passed. If not given, <dict> is used.

This method can be used to copy state between parsers.

バージョン 3.2 で追加.

get(section, option, *, raw=False, vars=None[, fallback])

Get an option value for the named section. If vars is provided, it must be a dictionary. The option is looked up in vars (if provided), section, and in DEFAULTSECT in that order. If the key is not found and fallback is provided, it is used as a fallback value. None can be provided as a fallback value.

raw が真でない時には、全ての '%' 置換は展開されてから返されます。置換後の値はオプションと同じ順序で探されます。

バージョン 3.2 で変更: Arguments raw, vars and fallback are keyword only to protect users from trying to use the third argument as the fallback fallback (especially when using the mapping protocol).

getint(section, option, *, raw=False, vars=None[, fallback])

A convenience method which coerces the option in the specified section to an integer. See get() for explanation of raw, vars and fallback.

getfloat(section, option, *, raw=False, vars=None[, fallback])

A convenience method which coerces the option in the specified section to a floating point number. See get() for explanation of raw, vars and fallback.

getboolean(section, option, *, raw=False, vars=None[, fallback])

A convenience method which coerces the option in the specified section to a Boolean value. Note that the accepted values for the option are '1', 'yes', 'true', and 'on', which cause this method to return True, and '0', 'no', 'false', and 'off', which cause it to return False. These string values are checked in a case-insensitive manner. Any other value will cause it to raise ValueError. See get() for explanation of raw, vars and fallback.

items(raw=False, vars=None)
items(section, raw=False, vars=None)

When section is not given, return a list of section_name, section_proxy pairs, including DEFAULTSECT.

Otherwise, return a list of name, value pairs for the options in the given section. Optional arguments have the same meaning as for the get() method.

バージョン 3.2 で変更: Items present in vars no longer appear in the result. The previous behaviour mixed actual parser options with variables provided for interpolation.

set(section, option, value)

If the given section exists, set the given option to the specified value; otherwise raise NoSectionError. option and value must be strings; if not, TypeError is raised.

write(fileobject, space_around_delimiters=True)

Write a representation of the configuration to the specified file object, which must be opened in text mode (accepting strings). This representation can be parsed by a future read() call. If space_around_delimiters is true, delimiters between keys and values are surrounded by spaces.

remove_option(section, option)

Remove the specified option from the specified section. If the section does not exist, raise NoSectionError. If the option existed to be removed, return True; otherwise return False.

remove_section(section)

Remove the specified section from the configuration. If the section in fact existed, return True. Otherwise return False.

optionxform(option)

Transforms the option name option as found in an input file or as passed in by client code to the form that should be used in the internal structures. The default implementation returns a lower-case version of option; subclasses may override this or client code can set an attribute of this name on instances to affect this behavior.

You don’t need to subclass the parser to use this method, you can also set it on an instance, to a function that takes a string argument and returns a string. Setting it to str, for example, would make option names case sensitive:

cfgparser = ConfigParser()
cfgparser.optionxform = str

Note that when reading configuration files, whitespace around the option names is stripped before optionxform() is called.

readfp(fp, filename=None)

バージョン 3.2 で撤廃: Use read_file() instead.

バージョン 3.2 で変更: readfp() now iterates on f instead of calling f.readline().

For existing code calling readfp() with arguments which don’t support iteration, the following generator may be used as a wrapper around the file-like object:

def readline_generator(f):
    line = f.readline()
    while line:
        yield line
        line = f.readline()

Instead of parser.readfp(f) use parser.read_file(readline_generator(f)).

configparser.MAX_INTERPOLATION_DEPTH

The maximum depth for recursive interpolation for get() when the raw parameter is false. This is relevant only when the default interpolation is used.

14.2.10. RawConfigParser オブジェクト

class configparser.RawConfigParser(defaults=None, dict_type=collections.OrderedDict, allow_no_value=False, *, delimiters=('=', ':'), comment_prefixes=('#', ';'), inline_comment_prefixes=None, strict=True, empty_lines_in_values=True, default_section=configparser.DEFAULTSECT[, interpolation])

Legacy variant of the ConfigParser with interpolation disabled by default and unsafe add_section and set methods.

注釈

Consider using ConfigParser instead which checks types of the values to be stored internally. If you don’t want interpolation, you can use ConfigParser(interpolation=None).

add_section(section)

Add a section named section to the instance. If a section by the given name already exists, DuplicateSectionError is raised. If the default section name is passed, ValueError is raised.

Type of section is not checked which lets users create non-string named sections. This behaviour is unsupported and may cause internal errors.

set(section, option, value)

与えられたセクションが存在していれば、オプションを指定された値に設定します。セクションが存在しなければ NoSectionError を発生させます。 RawConfigParser (あるいは raw パラメータをセットした ConfigParser) を文字列型でない値の 内部的な 格納場所として使うことは可能ですが、すべての機能 (置換やファイルへの出力を含む) がサポートされるのは文字列を値として使った場合だけです。

ユーザーは、このメソッドを使って非文字列の値をキーに代入できます。この振る舞いはサポートされておらず、非rawモードでの値の取得や、ファイルへの書き出しを試みた際にエラーの原因となりえます。 このような代入を許さない マッピングプロトコルAPIを使用してください

14.2.11. 例外

exception configparser.Error

Base class for all other configparser exceptions.

exception configparser.NoSectionError

指定したセクションが見つからなかった時に起きる例外です。

exception configparser.DuplicateSectionError

Exception raised if add_section() is called with the name of a section that is already present or in strict parsers when a section if found more than once in a single input file, string or dictionary.

バージョン 3.2 で追加: Optional source and lineno attributes and arguments to __init__() were added.

exception configparser.DuplicateOptionError

Exception raised by strict parsers if a single option appears twice during reading from a single file, string or dictionary. This catches misspellings and case sensitivity-related errors, e.g. a dictionary may have two keys representing the same case-insensitive configuration key.

exception configparser.NoOptionError

Exception raised when a specified option is not found in the specified section.

exception configparser.InterpolationError

文字列の置換中に問題が起きた時に発生する例外の基底クラスです。

exception configparser.InterpolationDepthError

Exception raised when string interpolation cannot be completed because the number of iterations exceeds MAX_INTERPOLATION_DEPTH. Subclass of InterpolationError.

exception configparser.InterpolationMissingOptionError

InterpolationError の派生クラスで、値が参照しているオプションが見つからない場合に発生する例外です。

exception configparser.InterpolationSyntaxError

Exception raised when the source text into which substitutions are made does not conform to the required syntax. Subclass of InterpolationError.

exception configparser.MissingSectionHeaderError

セクションヘッダを持たないファイルを構文解析しようとした時に起きる例外です。

exception configparser.ParsingError

ファイルの構文解析中にエラーが起きた場合に発生する例外です。

バージョン 3.2 で変更: The filename attribute and __init__() argument were renamed to source for consistency.

脚注

[1](1, 2, 3, 4, 5, 6, 7, 8, 9) Config parsers allow for heavy customization. If you are interested in changing the behaviour outlined by the footnote reference, consult the Customizing Parser Behaviour section.