Python经验总结 | One Night in Mok's Studio

Contents

1. 时间戳 —> 时间字符串 ‘%Y-%m-%d %H:%M:%S’
2. 时间字符串 —> 时间戳 1407934120.0

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连续空格替换为1个空格

1 2	s = ' 1 3 579' s = ' '.join(s.split())

获取文件名、当前路径、python所在路径

filename = os.path.basename(path_filename)
import os
import sys
print os.getcwd() 
print sys.executable

时间格式化

1 2	import time time.strftime('%Y-%m-%d %H:%M:%S')

时间戳 —> 时间字符串 ‘%Y-%m-%d %H:%M:%S’

1 2	timestamp = time.time() time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(timestamp))

时间字符串 —> 时间戳 1407934120.0

1 2	str_time = "2014-08-13 20:48:40" time.mktime(time.strptime(str_time, "%Y-%m-%d %H:%M:%S"))

字典反转

1 2	from itertools import izip dict(izip(d.itervalues(), d.iterkeys()))

字典排序

def sortDict(adict):
    l_keys = adict.keys()
    l_keys.sort()
    _dict = {}
    for k in l_keys:
        _dict[k] = adict[k]
    return _dict

合并字典

def merge_dict(d1, d2):
    d3 = {}
    for k,v in d1.iteritems():
        d3[k] = v
    for k,v in d2.iteritems():
        if k in d3.keys():
            print 'd1 & d2 has the same key.'
        d3[k] = v
    return d3

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import os
os.path.isfile('test.txt') #如果不存在就返回False
os.path.exists(directory) #如果目录不存在就返回False

二分法查找/插入元素的index

import bisect
L = [1,3,5,7,9]
x = 6
a = bisect.bisect_left(L, x)
b = bisect.bisect_right(L, x)
print a,b
x = 7
a = bisect.bisect_left(L, x)
b = bisect.bisect_right(L, x)
print a,b
L = [1,3,5,7,9]
a = bisect.insort_left(L, x)
print L
L = [1,3,5,7,9]
b = bisect.insort_right(L, x)
print L