Python读写properties文件

 Python读写properties文件

import re
import os
import tempfile


class Properties:

    def __init__(self, file_name):
        self.file_name = file_name
        self.properties = {}
        try:
            fopen = open(self.file_name, 'r')
            for line in fopen:
                line = line.strip()
                if line.find('=') > 0 and not line.startswith('#'):
                    strs = line.split('=')
                    self.properties[strs[0].strip()] = strs[1].strip()
        except Exception, e:
            raise e
        else:
            fopen.close()

    def has_key(self, key):
        return key in self.properties

    def get(self, key, default_value=''):
        if key in self.properties:
            return self.properties[key]
        return default_value

    def put(self, key, value):
        self.properties[key] = value
        replace_property(self.file_name, key + '=.*', key + '=' + value, True)


def parse(file_name):
    return Properties(file_name)


def replace_property(file_name, from_regex, to_str, append_on_not_exists=True):
    tmpfile = tempfile.TemporaryFile()

    if os.path.exists(file_name):
        r_open = open(file_name, 'r')
        pattern = re.compile(r'' + from_regex)
        found = None
        for line in r_open:
            if pattern.search(line) and not line.strip().startswith('#'):
                found = True
                line = re.sub(from_regex, to_str, line)
            tmpfile.write(line)
        if not found and append_on_not_exists:
            tmpfile.write('\n' + to_str)
        r_open.close()
        tmpfile.seek(0)

        content = tmpfile.read()

        if os.path.exists(file_name):
            os.remove(file_name)

        w_open = open(file_name, 'w')
        w_open.write(content)
        w_open.close()

        tmpfile.close()
    else:
        print "file %s not found" % file_name

使用方式：

file_path = 'xxx.properties'
props = property.parse(file_path)   #读取文件
props.put('key_a', 'value_a')       #修改/添加key=value
print props.get('key_a')            #根据key读取value
print "props.has_key('key_a')=" + str(props.has_key('key_a'))   #判断是否包含该key

参考： 
Python实用脚本（1）：读取Properties文件

 

Python实用脚本（1）：读取Properties文件

(2013-04-19 20:39:52)

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标签： it

分类： Python

JAVA本身提供了对于Properties文件操作的类，项目中的很多配置信息都是放在了Properties文件。但是Python并没有提供操作Properties文件的库，所以，自己动手写个一个可以加载Properties文件的脚本。

 

class Properties:

    fileName = ''

 

    def __init__(self, fileName):

        self.fileName = fileName

 

    def getProperties(self):   

    try:

    pro_file = open(self.fileName, 'r')

       properties = {}

       for line in pro_file:

           if line.find('=') > 0:

               strs = line.replace('\n', '').split('=')

               properties[strs[0]] = strs[1]

    except Exception, e:

    raise e

    else:

    pro_file.close()

        return properties

 

实际调用：

fileName = sys.path[0] + '\\'+ 'system.properties'

p = Properties(fileName)

properties = p.getProperties()

print properties[Key]