python教程分享python configparser中默认值的设定方式

目录

• configparser中默认值的设定
• 解决方案
• 使用configparser的注意事项
• 注意要点

try:      apple = config.get(section, 'apple')  except nosectionerror, nooptionerror:      apple = none

class defaultoption(dict):      def __init__(self, config, section, **kv):          self._cOnfig= config          self._section = section          dict.__init__(self, **kv)      def items(self):          _items = []          for option in self:              if not self._config.has_option(self._section, option):                  _items.append((option, self[option]))              else:                  value_in_cOnfig= self._config.get(self._section, option)                  _items.append((option, value_in_config))          return _items

def read_config(section, location):      cOnfig= configparser.configparser()      config.read(location)      apple = config.get(section, 'apple',                         vars=defaultoption(config, section, apple=none))      pear = config.get(section, 'pear',                        vars=defaultoption(config, section, pear=none))      banana = config.get(section, 'banana',                          vars=defaultoption(config, section, banana=none))      return apple, pear, banana

[default]  serveraliveinterval = 45  compression = yes  compressiOnlevel= 9  forwardx11 = yes  [bitbucket.org]  user = hg  [topsecret.server.com]  port = 50022  forwardx11 = no

>> 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'

[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?  

config.write(open（'example.ini', 'w'）)

with open('example.ini', 'w') as configfile:      config.write(configfile)