常用python函数

#!/usr/bin/env python
# coding: utf8
import os
import sys
import calendar
import datetime

# 函数运行时间测试装饰器
import time
from functools import wraps
def fn_timer(function):
    @wraps(function)
    def function_timer(*args, **kwargs):
        t0 = time.time()
        result = function(*args, **kwargs)
        t1 = time.time()
        print ("Total time running %s: %s seconds" %
                (function.func_name, str(t1-t0))
                )
        return result
    return function_timer

def string_to_datetime(content):
    assert isinstance(content, str) or isinstance(content, unicode)
    return datetime.datetime.strptime(content, "%Y-%m-%d %H:%M:%S")


def datetime_to_timestamp(time_obj):
    assert isinstance(time_obj, datetime.datetime)
    return calendar.timegm(time_obj.timetuple()) - 8 * 3600


def date_to_timestamp(date_obj):
    assert isinstance(date_obj, datetime.date)
    time_obj = datetime.datetime.combine(date_obj, datetime.datetime.min.time())
    return calendar.timegm(time_obj.timetuple()) - 8 * 3600


def datetime_to_string(time_obj):
    assert isinstance(time_obj, datetime.datetime)
    return time_obj.strftime('%Y-%m-%d %H:%M:%S')


def datetime_to_string_no_space(time_obj):
    assert isinstance(time_obj, datetime.datetime)
    return time_obj.strftime('%Y-%m-%d_%H:%M:%S')


def timestamp_to_datetime(timestamp):
    assert isinstance(timestamp, int) or isinstance(timestamp, long) or isinstance(timestamp, float)
    return datetime.datetime.fromtimestamp(timestamp)


def timestamp_to_string(timestamp):
    assert isinstance(timestamp, int) or isinstance(timestamp, long) or isinstance(timestamp, float)
    return datetime_to_string(timestamp_to_datetime(timestamp))


def string_to_timestamp(time_str):
    assert isinstance(time_str, str) or isinstance(time_str, unicode)
    return datetime_to_timestamp(string_to_datetime(time_str))
    

# 递归的删除目录, path为目录的名字或路径
def delete_dir(path):
    for root, dirs, files in os.walk(path, True, None, False):
        for file in files:
            if (os.path.isfile(os.path.join(root, file)) == True):
                os.remove(os.path.join(root, file))
        os.removedirs(root)


import cookielib
import urllib
import urllib2
# 获取网页cookie的内容
center_url = 'http://www.qq.com/';
cj = cookielib.CookieJar();
opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cj));
urllib2.install_opener(opener);
resp = urllib2.urlopen(center_url);   
for item in cj:
    print 'name:   ' + item.name + '   value:   ' + item.value