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  • time模块

    一、在python中,时间的几种表达形式

    时间戳(timestamp):通常来说,时间戳表示的是从1970年一月一日00:00:00开始按秒计算的偏移量,我们运行type(time.time())返回的是浮点型<class 'float'>
    格式化时间字符串(format string)
    结构化时间(struct_time):struct_time元组共有9个元素,(年,月,日,时,分,秒,星期几,一年中第几天,夏令时)
    import time
    
    print(type(time.time()))
    print(time.time())#时间戳
    print(time.strftime('%Y-%m-%d %X'))#格式化的字符串时间
    """
    %Y年%m月%d日 %X时分秒
    """
    print(time.localtime())#本地时区的struct_time,默认参数是当前时间戳
    print(time.gmtime())#UTC时区的struct_time
    """
    <class 'float'>
    1528686563.300955
    2018-06-11 11:09:23
    time.struct_time(tm_year=2018, tm_mon=6, tm_mday=11, tm_hour=11, tm_min=9, tm_sec=23, tm_wday=0, tm_yday=162, tm_isdst=0)
    time.struct_time(tm_year=2018, tm_mon=6, tm_mday=11, tm_hour=3, tm_min=9, tm_sec=23, tm_wday=0, tm_yday=162, tm_isdst=0)
    """

    二、time模块的几种转换方式

    计算机认识的时间只能是时间戳格式,而程序员可处理的或者说人类能看懂的时间有:'格式化的时间字符串','结构化时间'

     1、时间戳转化为结构化时间

    now_time=time.time()
    print(now_time)
    struct_time=time.localtime(now_time)#时间戳转化为结构化时间
    print(struct_time)#tm_wday=0代表星期一,6代表星期日,tm_yday=162表示在这一年中已经过了162天了,tm_isdst=0指定为非夏令时,1为夏令时,-1为由系统判断
    """
    1528687081.7820013
    time.struct_time(tm_year=2018, tm_mon=6, tm_mday=11, tm_hour=11, tm_min=18, tm_sec=1, tm_wday=0, tm_yday=162, tm_isdst=0)
    """
    
    

    2、结构化时间转化为时间戳

    struct_time=time.localtime(time.time())
    print(struct_time)
    now_time=time.mktime(struct_time)
    print(now_time)
    """
    time.struct_time(tm_year=2018, tm_mon=6, tm_mday=11, tm_hour=11, tm_min=20, tm_sec=37, tm_wday=0, tm_yday=162, tm_isdst=0)
    1528687237.0
    """

    3、结构化时间转化为字符串时间

    struct_time=time.localtime(time.time())#把时间戳转换为结构化时间

    print(struct_time)

    str_time=time.strftime('%Y-%m-%d',struct_time)

    print(str_time)

    """

    time.struct_time(tm_year=2018, tm_mon=6, tm_mday=11, tm_hour=11, tm_min=23, tm_sec=52, tm_wday=0, tm_yday=162, tm_isdst=0)

    2018-06-11

    """

    4、字符串时间转化为结构化时间

    str_time='2018-04-17'
    struct_time=time.strptime(str_time,'%Y-%m-%d')
    print(struct_time)
    """
    time.struct_time(tm_year=2018, tm_mon=4, tm_mday=17, tm_hour=0, tm_min=0, tm_sec=0, tm_wday=1, tm_yday=107, tm_isdst=-1)
    
    """


    5、时间戳时间转化为字符串时间

    print(time.strftime('%Y-%m-%d %X',time.localtime(time.time())))
    """
    2018-06-11 11:44:11
    """

    6、字符串时间转化为时间戳

    print(time.mktime(time.strptime('2018-06-11 11:44:11','%Y-%m-%d %X')))
    """
    1528688651.0
    """
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  • 原文地址:https://www.cnblogs.com/z-x-y/p/9166372.html
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