模块，用一砣代码实现了某个功能的代码集合。
类似于函数式编程和面向过程编程，函数式编程则完成一个功能，其他代码用来调用即可，提供了代码的重用性和代码间的耦合。而对于一个复杂的功能来，可能需要多个函数才能完成（函数又可以在不同的.py文件中），n个 .py 文件组成的代码集合就称为模块。
如：os 是系统相关的模块；file是文件操作相关的模块
模块分为三种：
1 #!/usr/bin/env python 2 # _*_ coding:utf-8 _*_ 3 4 import time 5 6 7 # print(time.clock()) #返回处理器时间,3.3开始已废弃 , 改成了time.process_time()测量处理器运算时间,不包括sleep时间,不稳定,mac上测不出来 8 # print(time.altzone/60/60) #返回与utc时间的时间差,以秒计算\ 9 # print(time.asctime()) #返回时间格式"Fri Aug 19 11:14:16 2016", 10 # print(time.localtime()) #返回本地时间 的struct time对象格式 11 # print(time.gmtime(time.time()-800000)) #返回utc时间的struc时间对象格式 12 # 13 # print(time.asctime(time.localtime())) #返回时间格式"Fri Aug 19 11:14:16 2016", 14 # print(time.ctime()) #返回Fri Aug 19 12:38:29 2016 格式, 同上 15 16 17 18 # 日期字符串 转成 时间戳 19 # string_2_struct = time.strptime("2016/05/22","%Y/%m/%d") #将 日期字符串 转成 struct时间对象格式 20 # print(string_2_struct) 21 # # 22 # struct_2_stamp = time.mktime(string_2_struct) #将struct时间对象转成时间戳 23 # print(struct_2_stamp) 24 25 26 27 #将时间戳转为字符串格式 28 # print(time.gmtime(time.time()-86640)) #将utc时间戳转换成struct_time格式 29 # print(time.strftime("%Y-%m-%d %H:%M:%S",time.gmtime()) ) #将utc struct_time格式转成指定的字符串格式 30 31 32 33 34 35 #时间加减 36 import datetime 37 38 # print(datetime.datetime.now()) #返回 2016-08-19 12:47:03.941925 39 #print(datetime.date.fromtimestamp(time.time()) ) # 时间戳直接转成日期格式 2016-08-19 40 # print(datetime.datetime.now() ) 41 # print(datetime.datetime.now() + datetime.timedelta(3)) #当前时间+3天 42 # print(datetime.datetime.now() + datetime.timedelta(-3)) #当前时间-3天 43 # print(datetime.datetime.now() + datetime.timedelta(hours=3)) #当前时间+3小时 44 # print(datetime.datetime.now() + datetime.timedelta(minutes=30)) #当前时间+30分 45 46 47 # 48 # c_time = datetime.datetime.now() 49 # print(c_time.replace(minute=3,hour=2)) #时间替
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Directive |
Meaning |
Notes |
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%a |
Locale’s abbreviated weekday name. |
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%A |
Locale’s full weekday name. |
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%b |
Locale’s abbreviated month name. |
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%B |
Locale’s full month name. |
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%c |
Locale’s appropriate date and time representation. |
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%d |
Day of the month as a decimal number [01,31]. |
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%H |
Hour (24-hour clock) as a decimal number [00,23]. |
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%I |
Hour (12-hour clock) as a decimal number [01,12]. |
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%j |
Day of the year as a decimal number [001,366]. |
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%m |
Month as a decimal number [01,12]. |
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%M |
Minute as a decimal number [00,59]. |
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%p |
Locale’s equivalent of either AM or PM. |
(1) |
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%S |
Second as a decimal number [00,61]. |
(2) |
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%U |
Week number of the year (Sunday as the first day of the week) as a decimal number [00,53]. All days in a new year preceding the first Sunday are considered to be in week 0. |
(3) |
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%w |
Weekday as a decimal number [0(Sunday),6]. |
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%W |
Week number of the year (Monday as the first day of the week) as a decimal number [00,53]. All days in a new year preceding the first Monday are considered to be in week 0. |
(3) |
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%x |
Locale’s appropriate date representation. |
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%X |
Locale’s appropriate time representation. |
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%y |
Year without century as a decimal number [00,99]. |
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%Y |
Year with century as a decimal number. |
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%z |
Time zone offset indicating a positive or negative time difference from UTC/GMT of the form +HHMM or -HHMM, where H represents decimal hour digits and M represents decimal minute digits [-23:59, +23:59]. |
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%Z |
Time zone name (no characters if no time zone exists). |
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%% |
A literal ‘%‘ character. |
原文：http://www.cnblogs.com/can-H/p/6414877.html
