• Python time&datetime模块


    1.time&datetime模块

      time&datetime是时间模块,常用以处理时间相关问题

    time.time()        #返回当前时间的时间戳timestamp
    
    time.sleep()       #睡眠时间,默认秒
    
    time.gmtime()    #时间戳转换成UTC时间的struct_time
    
    time.localtime()  #时间戳转换成返回本地时间的struct_time
    
    time.asctime()    #struct_time转换成本地时间的标准化string时间
    
    time.ctime()       #时间戳转换成本地时间的标准化string时间
    
    time.mktime()    #struct_time转换成本地时间的时间戳timestamp
    
    time.strftime()    #解析struct_time,自定义格式化显示时间
    
    time.strptime()    #解析格式化时间,返回struct_time

      常用功能使用说明

    # -*- coding:utf-8 -*-
    # Author:Wong Du
    
    '''
        time&datetime是时间模块,
        常用以处理时间相关问题
    '''
    
    
    import time
    '''
    time模块时间的3种形式
    1.timestamp 时间戳
        e.g. 1521164794.9068174
    2.struct_time 结构化时间(元组形式表示)
        e.g. time.struct_time(tm_year=2078, tm_mon=6, tm_mday=25, tm_hour=22, 
             tm_min=57, tm_sec=22, tm_wday=5, tm_yday=176, tm_isdst=0)
    3.string_time 字符串表示(时间的人性化显示,一般人类可读)
        e.g. Fri Mar 16 09:49:13 2018
    '''
    # 时间戳
    print(time.time())
    # 结构化
    print(time.localtime())
    # 字符串
    print(time.asctime())
    
    # time.asctime(p_tuple=None) --> string,
    # 解析一个tuple结构化时间,返回其标准化时间的string,如:Fri Mar 16 09:51:26 2018,
    # 若tuple为空,则返回当前时间的string
    m = (2018, 3, 16, 10, 0, 52, 4, 75, 0)
    print(time.asctime(m))
    
    # time.ctime(seconds=None) --> string,
    # 时间戳转化成标准化时间的string,若seconds为空,
    # 则返回当前时间的string
    print(time.ctime(2222222222))
    
    # time.gmtime(seconds=None) --> struct_time,
    # 时间戳转换成UTC时间的struct_time,和中国时间差8个小时
    # 若seconds为空,则返回当前UTC时间的struct_time
    print(time.gmtime(2222222))
    
    # time.localtime(seconds=None) --> struct_time,
    # 时间戳转换成struct_time,
    # 若seconds为空,则返回当前的struct_time
    print(time.localtime(2222222))
    
    # time.mktime(p_tuple) --> timestamp
    # 把struct_time转换成时间戳timestamp,
    print(time.mktime(m))
    
    
    # 获取本地当前时间的时间戳
    print(time.time())
    
    # 设置睡眠时间,单位秒
    time.sleep(0.1)
    
    # time.strftime(format,p_tuple=None) --> format_time
    # 解析p_tuple,自定义格式显示,如:2018-01-03,
    # 若p_tuple为空,则格式化显示本地当前时间
    print(time.strftime("%Y-%m-%d %H:%M:%S",m))
    
    # time.strptime(string,format) --> struct_time,
    # 解析string,获取到string表示的struct_time
    print(time.strptime("2018-1-1","%Y-%m-%d"))
    
    
    import datetime
    # 获取本地当前时间,格式: %Y-%m-%d %H:%M:%S
    print(datetime.datetime.now())
    
    # 时间加减,默认顺序:days,秒,微秒,毫秒,minutes,hours,weeks
    print(datetime.datetime.now() + datetime.timedelta(1))  #+1day
    print(datetime.datetime.now() + datetime.timedelta(-3))  #-3day
    print(datetime.datetime.now() + datetime.timedelta(minutes=-10))  #-10minutes
    print(datetime.datetime.now() + datetime.timedelta(weeks=1))  #+7day
    
    # 时间替换
    """
    replace(self, year=None, month=None, day=None, hour=None,
                    minute=None, second=None, microsecond=None, tzinfo=True)
    """
    print(datetime.datetime.now().replace(year=2022))
    常用功能详解

      其他

    时间格式化显示:
    
    %Y  Year with century as a decimal number.
    %m  Month as a decimal number [01,12].
    %d  Day of the month as a decimal number [01,31].
    %H  Hour (24-hour clock) as a decimal number [00,23].
    %M  Minute as a decimal number [00,59].
    %S  Second as a decimal number [00,61].
    %z  Time zone offset from UTC.
    %a  Locale's abbreviated weekday name.
    %A  Locale's full weekday name.
    %b  Locale's abbreviated month name.
    %B  Locale's full month name.
    %c  Locale's appropriate date and time representation.
    %I  Hour (12-hour clock) as a decimal number [01,12].
    %p  Locale's equivalent of either AM or PM.

      三种时间格式关系示例图

    静静的学习一阵子儿...
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  • 原文地址:https://www.cnblogs.com/Caiyundo/p/8580712.html
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