在java 编程中，很多配置文件用键值对的方式存储在 properties 文件中，可以读取，修改。而且在java 中有 java.util.Properties 这个类，可以很方便的处理properties 文件， 在python 中虽然也有读取配置文件的类ConfigParser, 但如果习惯java 编程的人估计更喜欢下面这个用python 实现的读取 properties 文件的类：

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"""
A Python replacement for java.util.Properties class
This is modelled as closely as possible to the Java original. 
"""

import sys,os
import re
import time

class IllegalArgumentException(Exception):

  def __init__(self, lineno, msg):
    self.lineno = lineno
    self.msg = msg

  def __str__(self):
    s='Exception at line number %d => %s' % (self.lineno, self.msg)
    return s

class Properties(object):
  """ A Python replacement for java.util.Properties """

  def __init__(self, props=None):

    # Note: We don't take a default properties object
    # as argument yet

    # Dictionary of properties.
    self._props = {}
    # Dictionary of properties with 'pristine' keys
    # This is used for dumping the properties to a file
    # using the 'store' method
    self._origprops = {}

    # Dictionary mapping keys from property
    # dictionary to pristine dictionary
    self._keymap = {}

    self.othercharre = re.compile(r'(?',line
        # Means we need to split by space.
        first, last = m2.span()
        sepidx = first
      elif m:
        # print 'Other match=>',line
        # No matching wspace char found, need
        # to split by either '=' or ':'
        first, last = m.span()
        sepidx = last - 1
        # print line[sepidx]


      # If the last character is a backslash
      # it has to be preceded by a space in which
      # case the next line is read as part of the
      # same property
      while line[-1] == '\\':
        # Read next line
        nextline = i.next()
        nextline = nextline.strip()
        lineno += 1
        # This line will become part of the value
        line = line[:-1] + nextline

      # Now split to key,value according to separation char
      if sepidx != -1:
        key, value = line[:sepidx], line[sepidx+1:]
      else:
        key,value = line,''

      self.processPair(key, value)

  def processPair(self, key, value):
    """ Process a (key, value) pair """

    oldkey = key
    oldvalue = value

    # Create key intelligently
    keyparts = self.bspacere.split(key)
    # print keyparts

    strippable = False
    lastpart = keyparts[-1]

    if lastpart.find('\\ ') != -1:
      keyparts[-1] = lastpart.replace('\\','')

    # If no backspace is found at the end, but empty
    # space is found, strip it
    elif lastpart and lastpart[-1] == ' ':
      strippable = True

    key = ''.join(keyparts)
    if strippable:
      key = key.strip()
      oldkey = oldkey.strip()

    oldvalue = self.unescape(oldvalue)
    value = self.unescape(value)

    self._props[key] = value.strip()

    # Check if an entry exists in pristine keys
    if self._keymap.has_key(key):
      oldkey = self._keymap.get(key)
      self._origprops[oldkey] = oldvalue.strip()
    else:
      self._origprops[oldkey] = oldvalue.strip()
      # Store entry in keymap
      self._keymap[key] = oldkey

  def escape(self, value):

    # Java escapes the '=' and ':' in the value
    # string with backslashes in the store method.
    # So let us do the same.
    newvalue = value.replace(':','\:')
    newvalue = newvalue.replace('=','\=')

    return newvalue

  def unescape(self, value):

    # Reverse of escape
    newvalue = value.replace('\:',':')
    newvalue = newvalue.replace('\=','=')

    return newvalue  

  def load(self, stream):
    """ Load properties from an open file stream """

    # For the time being only accept file input streams
    if type(stream) is not file:
      raise TypeError,'Argument should be a file object!'
    # Check for the opened mode
    if stream.mode != 'r':
      raise ValueError,'Stream should be opened in read-only mode!'

    try:
      lines = stream.readlines()
      self.__parse(lines)
    except IOError, e:
      raise

  def getProperty(self, key):
    """ Return a property for the given key """

    return self._props.get(key,'')

  def setProperty(self, key, value):
    """ Set the property for the given key """

    if type(key) is str and type(value) is str:
      self.processPair(key, value)
    else:
      raise TypeError,'both key and value should be strings!'

  def propertyNames(self):
    """ Return an iterator over all the keys of the property
    dictionary, i.e the names of the properties """

    return self._props.keys()

  def list(self, out=sys.stdout):
    """ Prints a listing of the properties to the
    stream 'out' which defaults to the standard output """

    out.write('-- listing properties --\n')
    for key,value in self._props.items():
      out.write(''.join((key,'=',value,'\n')))

  def store(self, out, header=""):
    """ Write the properties list to the stream 'out' along
    with the optional 'header' """

    if out.mode[0] != 'w':
      raise ValueError,'Steam should be opened in write mode!'

    try:
      out.write(''.join(('#',header,'\n')))
      # Write timestamp
      tstamp = time.strftime('%a %b %d %H:%M:%S %Z %Y', time.localtime())
      out.write(''.join(('#',tstamp,'\n')))
      # Write properties from the pristine dictionary
      for prop, val in self._origprops.items():
        out.write(''.join((prop,'=',self.escape(val),'\n')))

      out.close()
    except IOError, e:
      raise

  def getPropertyDict(self):
    return self._props

  def __getitem__(self, name):
    """ To support direct dictionary like access """

    return self.getProperty(name)

  def __setitem__(self, name, value):
    """ To support direct dictionary like access """

    self.setProperty(name, value)

  def __getattr__(self, name):
    """ For attributes not found in self, redirect
    to the properties dictionary """

    try:
      return self.__dict__[name]
    except KeyError:
      if hasattr(self._props,name):
        return getattr(self._props, name)

if __name__=="__main__":
  p = Properties()
  p.load(open('test2.properties'))
  p.list()
  print p
  print p.items()
  print p['name3']
  p['name3'] = 'changed = value'
  print p['name3']  
  p['new key'] = 'new value'
  p.store(open('test2.properties','w'))

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本文名称：在python中修改.properties文件的操作-创新互联
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