Python 时间库 datetime

dir(datetime)Out[23]: ['MAXYEAR', 'MINYEAR', '__doc__', '__name__', '__package__', 'date', 'datetime', 'datetime_CAPI', 'time', 'timedelta', 'tzinfo']

包含的数据：
MAXYEAR -- 能表示的最大年份
MINYEAR -- 能表示的最小年份
datetime_CAPI  -- C语言api访问的对象，可以help(datetime.datetime_CAPI)
 
包含的对象：
    date -- 日期对象
    datetime -- 日期时间对象
    time -- 时间对象
    timedelta -- 日期时间间隔对象

    tzinfo -- 时区信息对象

import datetimehelp(datetime)Help on built-in module datetime:NAME    datetime - Fast implementation of the datetime type.FILE    (built-in)CLASSES    __builtin__.object        date            datetime        time        timedelta        tzinfo        class date(__builtin__.object)     |  date(year, month, day) --> date object     |       |  Methods defined here:     |       |  __add__(...)     |      x.__add__(y) <==> x+y     |       |  __eq__(...)     |      x.__eq__(y) <==> x==y     |       |  __format__(...)     |      Formats self with strftime.     |       |  __ge__(...)     |      x.__ge__(y) <==> x>=y     |       |  __getattribute__(...)     |      x.__getattribute__('name') <==> x.name     |       |  __gt__(...)     |      x.__gt__(y) <==> x>y     |       |  __hash__(...)     |      x.__hash__() <==> hash(x)     |       |  __le__(...)     |      x.__le__(y) <==> x<=y     |       |  __lt__(...)     |      x.__lt__(y) <==> x<y     |       |  __ne__(...)     |      x.__ne__(y) <==> x!=y     |       |  __radd__(...)     |      x.__radd__(y) <==> y+x     |       |  __reduce__(...)     |      __reduce__() -> (cls, state)     |       |  __repr__(...)     |      x.__repr__() <==> repr(x)     |       |  __rsub__(...)     |      x.__rsub__(y) <==> y-x     |       |  __str__(...)     |      x.__str__() <==> str(x)     |       |  __sub__(...)     |      x.__sub__(y) <==> x-y     |       |  ctime(...)     |      Return ctime() style string.     |       |  fromordinal(...)     |      int -> date corresponding to a proleptic Gregorian ordinal.     |       |  fromtimestamp(...)     |      timestamp -> local date from a POSIX timestamp (like time.time()).     |       |  isocalendar(...)     |      Return a 3-tuple containing ISO year, week number, and weekday.     |       |  isoformat(...)     |      Return string in ISO 8601 format, YYYY-MM-DD.     |       |  isoweekday(...)     |      Return the day of the week represented by the date.     |      Monday == 1 ... Sunday == 7     |       |  replace(...)     |      Return date with new specified fields.     |       |  strftime(...)     |      format -> strftime() style string.     |       |  timetuple(...)     |      Return time tuple, compatible with time.localtime().     |       |  today(...)     |      Current date or datetime:  same as self.__class__.fromtimestamp(time.time()).     |       |  toordinal(...)     |      Return proleptic Gregorian ordinal.  January 1 of year 1 is day 1.     |       |  weekday(...)     |      Return the day of the week represented by the date.     |      Monday == 0 ... Sunday == 6     |       |  ----------------------------------------------------------------------     |  Data descriptors defined here:     |       |  day     |       |  month     |       |  year     |       |  ----------------------------------------------------------------------     |  Data and other attributes defined here:     |       |  __new__ = <built-in method __new__ of type object>     |      T.__new__(S, ...) -> a new object with type S, a subtype of T     |       |  max = datetime.date(9999, 12, 31)     |       |  min = datetime.date(1, 1, 1)     |       |  resolution = datetime.timedelta(1)        class datetime(date)     |  datetime(year, month, day[, hour[, minute[, second[, microsecond[,tzinfo]]]]])     |       |  The year, month and day arguments are required. tzinfo may be None, or an     |  instance of a tzinfo subclass. The remaining arguments may be ints or longs.     |       |  Method resolution order:     |      datetime     |      date     |      __builtin__.object     |       |  Methods defined here:     |       |  __add__(...)     |      x.__add__(y) <==> x+y     |       |  __eq__(...)     |      x.__eq__(y) <==> x==y     |       |  __ge__(...)     |      x.__ge__(y) <==> x>=y     |       |  __getattribute__(...)     |      x.__getattribute__('name') <==> x.name     |       |  __gt__(...)     |      x.__gt__(y) <==> x>y     |       |  __hash__(...)     |      x.__hash__() <==> hash(x)     |       |  __le__(...)     |      x.__le__(y) <==> x<=y     |       |  __lt__(...)     |      x.__lt__(y) <==> x<y     |       |  __ne__(...)     |      x.__ne__(y) <==> x!=y     |       |  __radd__(...)     |      x.__radd__(y) <==> y+x     |       |  __reduce__(...)     |      __reduce__() -> (cls, state)     |       |  __repr__(...)     |      x.__repr__() <==> repr(x)     |       |  __rsub__(...)     |      x.__rsub__(y) <==> y-x     |       |  __str__(...)     |      x.__str__() <==> str(x)     |       |  __sub__(...)     |      x.__sub__(y) <==> x-y     |       |  astimezone(...)     |      tz -> convert to local time in new timezone tz     |       |  combine(...)     |      date, time -> datetime with same date and time fields     |       |  ctime(...)     |      Return ctime() style string.     |       |  date(...)     |      Return date object with same year, month and day.     |       |  dst(...)     |      Return self.tzinfo.dst(self).     |       |  fromtimestamp(...)     |      timestamp[, tz] -> tz's local time from POSIX timestamp.     |       |  isoformat(...)     |      [sep] -> string in ISO 8601 format, YYYY-MM-DDTHH:MM:SS[.mmmmmm][+HH:MM].     |           |      sep is used to separate the year from the time, and defaults to 'T'.     |       |  now(...)     |      [tz] -> new datetime with tz's local day and time.     |       |  replace(...)     |      Return datetime with new specified fields.     |       |  strptime(...)     |      string, format -> new datetime parsed from a string (like time.strptime()).     |       |  time(...)     |      Return time object with same time but with tzinfo=None.     |       |  timetuple(...)     |      Return time tuple, compatible with time.localtime().     |       |  timetz(...)     |      Return time object with same time and tzinfo.     |       |  tzname(...)     |      Return self.tzinfo.tzname(self).     |       |  utcfromtimestamp(...)     |      timestamp -> UTC datetime from a POSIX timestamp (like time.time()).     |       |  utcnow(...)     |      Return a new datetime representing UTC day and time.     |       |  utcoffset(...)     |      Return self.tzinfo.utcoffset(self).     |       |  utctimetuple(...)     |      Return UTC time tuple, compatible with time.localtime().     |       |  ----------------------------------------------------------------------     |  Data descriptors defined here:     |       |  hour     |       |  microsecond     |       |  minute     |       |  second     |       |  tzinfo     |       |  ----------------------------------------------------------------------     |  Data and other attributes defined here:     |       |  __new__ = <built-in method __new__ of type object>     |      T.__new__(S, ...) -> a new object with type S, a subtype of T     |       |  max = datetime.datetime(9999, 12, 31, 23, 59, 59, 999999)     |       |  min = datetime.datetime(1, 1, 1, 0, 0)     |       |  resolution = datetime.timedelta(0, 0, 1)     |       |  ----------------------------------------------------------------------     |  Methods inherited from date:     |       |  __format__(...)     |      Formats self with strftime.     |       |  fromordinal(...)     |      int -> date corresponding to a proleptic Gregorian ordinal.     |       |  isocalendar(...)     |      Return a 3-tuple containing ISO year, week number, and weekday.     |       |  isoweekday(...)     |      Return the day of the week represented by the date.     |      Monday == 1 ... Sunday == 7     |       |  strftime(...)     |      format -> strftime() style string.     |       |  today(...)     |      Current date or datetime:  same as self.__class__.fromtimestamp(time.time()).     |       |  toordinal(...)     |      Return proleptic Gregorian ordinal.  January 1 of year 1 is day 1.     |       |  weekday(...)     |      Return the day of the week represented by the date.     |      Monday == 0 ... Sunday == 6     |       |  ----------------------------------------------------------------------     |  Data descriptors inherited from date:     |       |  day     |       |  month     |       |  year        class time(__builtin__.object)     |  time([hour[, minute[, second[, microsecond[, tzinfo]]]]]) --> a time object     |       |  All arguments are optional. tzinfo may be None, or an instance of     |  a tzinfo subclass. The remaining arguments may be ints or longs.     |       |  Methods defined here:     |       |  __eq__(...)     |      x.__eq__(y) <==> x==y     |       |  __format__(...)     |      Formats self with strftime.     |       |  __ge__(...)     |      x.__ge__(y) <==> x>=y     |       |  __getattribute__(...)     |      x.__getattribute__('name') <==> x.name     |       |  __gt__(...)     |      x.__gt__(y) <==> x>y     |       |  __hash__(...)     |      x.__hash__() <==> hash(x)     |       |  __le__(...)     |      x.__le__(y) <==> x<=y     |       |  __lt__(...)     |      x.__lt__(y) <==> x<y     |       |  __ne__(...)     |      x.__ne__(y) <==> x!=y     |       |  __nonzero__(...)     |      x.__nonzero__() <==> x != 0     |       |  __reduce__(...)     |      __reduce__() -> (cls, state)     |       |  __repr__(...)     |      x.__repr__() <==> repr(x)     |       |  __str__(...)     |      x.__str__() <==> str(x)     |       |  dst(...)     |      Return self.tzinfo.dst(self).     |       |  isoformat(...)     |      Return string in ISO 8601 format, HH:MM:SS[.mmmmmm][+HH:MM].     |       |  replace(...)     |      Return time with new specified fields.     |       |  strftime(...)     |      format -> strftime() style string.     |       |  tzname(...)     |      Return self.tzinfo.tzname(self).     |       |  utcoffset(...)     |      Return self.tzinfo.utcoffset(self).     |       |  ----------------------------------------------------------------------     |  Data descriptors defined here:     |       |  hour     |       |  microsecond     |       |  minute     |       |  second     |       |  tzinfo     |       |  ----------------------------------------------------------------------     |  Data and other attributes defined here:     |       |  __new__ = <built-in method __new__ of type object>     |      T.__new__(S, ...) -> a new object with type S, a subtype of T     |       |  max = datetime.time(23, 59, 59, 999999)     |       |  min = datetime.time(0, 0)     |       |  resolution = datetime.timedelta(0, 0, 1)        class timedelta(__builtin__.object)     |  Difference between two datetime values.     |       |  Methods defined here:     |       |  __abs__(...)     |      x.__abs__() <==> abs(x)     |       |  __add__(...)     |      x.__add__(y) <==> x+y     |       |  __div__(...)     |      x.__div__(y) <==> x/y     |       |  __eq__(...)     |      x.__eq__(y) <==> x==y     |       |  __floordiv__(...)     |      x.__floordiv__(y) <==> x//y     |       |  __ge__(...)     |      x.__ge__(y) <==> x>=y     |       |  __getattribute__(...)     |      x.__getattribute__('name') <==> x.name     |       |  __gt__(...)     |      x.__gt__(y) <==> x>y     |       |  __hash__(...)     |      x.__hash__() <==> hash(x)     |       |  __le__(...)     |      x.__le__(y) <==> x<=y     |       |  __lt__(...)     |      x.__lt__(y) <==> x<y     |       |  __mul__(...)     |      x.__mul__(y) <==> x*y     |       |  __ne__(...)     |      x.__ne__(y) <==> x!=y     |       |  __neg__(...)     |      x.__neg__() <==> -x     |       |  __nonzero__(...)     |      x.__nonzero__() <==> x != 0     |       |  __pos__(...)     |      x.__pos__() <==> +x     |       |  __radd__(...)     |      x.__radd__(y) <==> y+x     |       |  __rdiv__(...)     |      x.__rdiv__(y) <==> y/x     |       |  __reduce__(...)     |      __reduce__() -> (cls, state)     |       |  __repr__(...)     |      x.__repr__() <==> repr(x)     |       |  __rfloordiv__(...)     |      x.__rfloordiv__(y) <==> y//x     |       |  __rmul__(...)     |      x.__rmul__(y) <==> y*x     |       |  __rsub__(...)     |      x.__rsub__(y) <==> y-x     |       |  __str__(...)     |      x.__str__() <==> str(x)     |       |  __sub__(...)     |      x.__sub__(y) <==> x-y     |       |  total_seconds(...)     |      Total seconds in the duration.     |       |  ----------------------------------------------------------------------     |  Data descriptors defined here:     |       |  days     |      Number of days.     |       |  microseconds     |      Number of microseconds (>= 0 and less than 1 second).     |       |  seconds     |      Number of seconds (>= 0 and less than 1 day).     |       |  ----------------------------------------------------------------------     |  Data and other attributes defined here:     |       |  __new__ = <built-in method __new__ of type object>     |      T.__new__(S, ...) -> a new object with type S, a subtype of T     |       |  max = datetime.timedelta(999999999, 86399, 999999)     |       |  min = datetime.timedelta(-999999999)     |       |  resolution = datetime.timedelta(0, 0, 1)        class tzinfo(__builtin__.object)     |  Abstract base class for time zone info objects.     |       |  Methods defined here:     |       |  __getattribute__(...)     |      x.__getattribute__('name') <==> x.name     |       |  __reduce__(...)     |      -> (cls, state)     |       |  dst(...)     |      datetime -> DST offset in minutes east of UTC.     |       |  fromutc(...)     |      datetime in UTC -> datetime in local time.     |       |  tzname(...)     |      datetime -> string name of time zone.     |       |  utcoffset(...)     |      datetime -> minutes east of UTC (negative for west of UTC).     |       |  ----------------------------------------------------------------------     |  Data and other attributes defined here:     |       |  __new__ = <built-in method __new__ of type object>     |      T.__new__(S, ...) -> a new object with type S, a subtype of TDATA    MAXYEAR = 9999    MINYEAR = 1    datetime_CAPI = <capsule object "datetime.datetime_CAPI">

dir(datetime.date)Out[24]: ['__add__', '__class__', '__delattr__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__le__', '__lt__', '__ne__', '__new__', '__radd__', '__reduce__', '__reduce_ex__', '__repr__', '__rsub__', '__setattr__', '__sizeof__', '__str__', '__sub__', '__subclasshook__', 'ctime', 'day', 'fromordinal', 'fromtimestamp', 'isocalendar', 'isoformat', 'isoweekday', 'max', 'min', 'month', 'replace', 'resolution', 'strftime', 'timetuple', 'today', 'toordinal', 'weekday', 'year']

包含的数据：
day -- 日号数值
month -- 月份数值
year -- 年份数值
max = datetime.date(9999, 12, 31)-- 最大的年、月、日的数值
min = datetime.date(1, 1, 1) -- 最小的年、月、日的数值
resolution = datetime.timedelta(1) -- 时间间隔单位为1天

包含的函数：
date(year, month, day) -- 构造函数，接受年、月、日三个参数，返回一个date object
ctime() -- 返回字符串格式的时间表示格式。不接受参数
fromordinal() -- 接受一个整型的天数数值，返回一个天数所等价的年数、月数、日数的date对象。
fromtimestamp() -- 接收一个浮点型的时间戳，返回一个从1970年起+时间戳的值对应的年、月、日的date对象。
isocalendar() -- 返回一个ISO标准的日历形式的3元元组，分别代表ISO year, week number, and weekday，不接收参数
isoformat() -- 返回一个ISO格式的日期字符串。格式为YYYY-MM-DD，不接收参数
isoweekday() -- 返回一个ISO格式的周表示。Monday == 1 ... Sunday == 7，不接收参数
replace() -- 返回一个替换指定日期字段的新date对象。参数3个可选参数，分别为year,month,day。注意替换是产生新对象，不影响原date对象。
strftime() -- 返回一个格式化的字符串形式日期。接收一个format参数，如：'%Y-%d-%m'
timetuple() -- 返回一个time的时间格式对象。等价于time.localtime()
today() -- 返回当前date或datetime对象。等价于fromtimestamp(time.time())
toordinal() -- 返回公元公历开始到现在的天数。公元1年1月1日为1
weekday() -- 返回日期表示的周期。Monday == 0 ... Sunday == 6

使用date对象中的函数，定义函数，获取本周和本月第一天的日期：

import datetimedef first_day_of_month():

  '''
  获取本月第一天
  :return:
  '''
    return datetime.date.today()- datetime.timedelta(days=datetime.datetime.now().day - 1)def first_day_of_week():

  '''
  获取本周第一天
  :return:
  '''
    return datetime.date.today() - datetime.timedelta(days = datetime.date.today().weekday())if __name__ == "__main__":    this_week = first_day_of_week()    last_week = this_week - datetime.timedelta(days = 7)    this_month = first_day_of_month()    last_month = this_month - datetime.timedelta(days = (this_month - datetime.timedelta(days = 1)).day)    print this_week    print last_week    print this_month    print last_month    2017-06-052017-05-292017-06-012017-05-01

dir(datetime.time)Out[33]: ['__class__', '__delattr__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__le__', '__lt__', '__ne__', '__new__', '__nonzero__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', 'dst', 'hour', 'isoformat', 'max', 'microsecond', 'min', 'minute', 'replace', 'resolution', 'second', 'strftime', 'tzinfo', 'tzname', 'utcoffset']

包含的数据：
hour -- 小时表示数值
microsecond -- 微秒表示数值
minute -- 分钟表示数值
second -- 秒表示数值
tzinfo -- 时区表示数值
max = datetime.time(23, 59, 59, 999999) -- 最大的时间表示数值
min = datetime.time(0, 0)  -- 最小的时间表示数值
resolution = datetime.timedelta(0, 0, 1) -- 时间间隔单位为分钟
 
包含的函数：
time([hour[, minute[, second[, microsecond[, tzinfo]]]]]) -- 构造函数，返回一个time对象。所有参数均为可选
dst() -- 返回时区信息的描述。如果实例是没有tzinfo参数则返回空
isoformat() -- 返回ISO 8601格式字符串, HH:MM:SS[.mmmmmm][+HH:MM].
replace() -- 返回一个替换指定时间字段的新time对象。4个可选参数，分别为hour,minute,second,microsecond。注意替换是产生新对象，不影响原time对象。
strftime() -- 接收一个format参数，返回一个对应格式的字符串。如:'%H:%M:%S'
tzname() -- 返回时区的名称。如果实例是没有tzinfo参数则返回空
utcoffset() -- 返回self.tzinfo.utcoffset(self)

dir(datetime.datetime)Out[25]: ['__add__', '__class__', '__delattr__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__le__', '__lt__', '__ne__', '__new__', '__radd__', '__reduce__', '__reduce_ex__', '__repr__', '__rsub__', '__setattr__', '__sizeof__', '__str__', '__sub__', '__subclasshook__', 'astimezone', 'combine', 'ctime', 'date', 'day', 'dst', 'fromordinal', 'fromtimestamp', 'hour', 'isocalendar', 'isoformat', 'isoweekday', 'max', 'microsecond', 'min', 'minute', 'month', 'now', 'replace', 'resolution', 'second', 'strftime', 'strptime', 'time', 'timetuple', 'timetz', 'today', 'toordinal', 'tzinfo', 'tzname', 'utcfromtimestamp', 'utcnow', 'utcoffset', 'utctimetuple', 'weekday', 'year']

继承自date的数据：
day
month
year

继承自date的函数：
fromordinal(...)
isocalendar(...)
isoweekday(...)
strftime(...)
today(...)
toordinal(...)
weekday(...)
 
包含的数据：
hour
microsecond
minute
second
tzinfo
max = datetime.datetime(9999, 12, 31, 23, 59, 59, 999999)
min = datetime.datetime(1, 1, 1, 0, 0)
resolution = datetime.timedelta(0, 0, 1)
 
包含的函数：
datetime(year, month, day[, hour[, minute[, second[, microsecond[,tzinfo]]]]])  -- 构造函数，返回一个datetime对象。year, month, day为必选参数
astimezone(...) -- 根据给定的timezone对象，返回转换为本地时区的timezone对象。
combine(...) -- 根据给定date, time对象合并后，返回一个对应值的datetime对象。
ctime(...) -- 返回ctime格式的字符串。
date(...) -- 返回具有相同year, month, day的date对象
dst(...) -- 返回self.tzinfo.dst(self).
fromtimestamp(...) -- 根据时间戳数值，返回一个datetime对象。
isoformat(...) -- 返回ISO 8601格式的字符串,如：YYYY-MM-DDTHH:MM:SS[.mmmmmm][+HH:MM]
now(...) -- 根据给定的时区，返回当地的当前时间。
replace(...) -- 返回一个替换了指定日期时间字段的新datetime对象
strptime(...) -- 根据string, format2个参数，返回一个对应的datetime对象。
time(...) -- 返回一个带有相同time，但没有tzinfo的time对象。
timetuple(...) -- 返回一个时间元素, 等价于time.localtime().
timetz(...) -- 返回一个带有相同time和tzinfo的time对象。 
tzname(...) -- 返回self.tzinfo.tzname(self).
utcfromtimestamp(...) -- 返回UTC时间戳的datetime对象，时间戳值为time.time()
utcnow(...) -- 返回UTC当前时间的datetime对象.
utcoffset(...) -- Return self.tzinfo.utcoffset(self).
utctimetuple(...) -- 返回UTC时间元组对象, 等价于time.localtime().

说明：
datetime.time对象调用了time模块的基础方法。并封装之。
datetime.date对象同样调用了time模块的基础方法，并封装之。
datetime.datetime对象继承了datetime.date类，并调用了time模块的方法。

import datetime"""datetime的功能强大能支持0001年到9999年""""""当前时间返回的是一个datetime类型now方法有个参数tz，设置时区类型。如果没有和方法today的效果一样"""now = datetime.datetime.now()#UTC时间datetime.datetime.utcnow()attrs = [("year","年"),('month',"月"),("day","日"),('hour',"小时"),( 'minute',"分"),( 'second',"秒"),( 'microsecond',"毫秒"),('min',"最小"),( 'max',"最大"),]for k,v in attrs:  "now.%s = %s #%s" % (k,getattr(now, k),v)"""返回一个time结构"""now.timetuple() """返回一个date类型"""now.date()"""返回一个time类型"""now.time()"""当前星期几。星期一是0，星期于是6注意这里是方法，不是属性哦。"""now.weekday()"""当前星期几。星期一是1，星期于是7注意这里是方法，不是属性哦。"""now.isoweekday()"""修改当前时间。比如修改成当月1号"""now.replace(day=1)past = datetime.datetime(2010,11,12,13,14,15,16)"""进行比较运算返回的是timedelta类型"""now-past"""转成字符串详细规则见Time篇"""strdatetime = now.strftime("%Y-%m-%d %H:%M:%S")"""字符串生成datetime对象"""datetime.datetime.strptime(strdatetime, "%Y-%m-%d %H:%M:%S")Out[69]: datetime.datetime(2017, 6, 5, 16, 30, 28)

dir(datetime.timedelta)Out[36]: ['__abs__', '__add__', '__class__', '__delattr__', '__div__', '__doc__', '__eq__', '__floordiv__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__le__', '__lt__', '__mul__', '__ne__', '__neg__', '__new__', '__nonzero__', '__pos__', '__radd__', '__rdiv__', '__reduce__', '__reduce_ex__', '__repr__', '__rfloordiv__', '__rmul__', '__rsub__', '__setattr__', '__sizeof__', '__str__', '__sub__', '__subclasshook__', 'days', 'max', 'microseconds', 'min', 'resolution', 'seconds', 'total_seconds']

包含的数据：
days -- 天数
microseconds -- 微秒数(>= 0 and less than 1 second).
seconds -- 秒数 (>= 0 and less than 1 day).
max = datetime.timedelta(999999999, 86399, 999999)
min = datetime.timedelta(-999999999)
resolution = datetime.timedelta(0, 0, 1)
 
包含的函数：
timedelta() -- 构造函数，接收3个参数，天、秒、微秒
total_seconds() -- 时间间隔的总秒数

常用时间转换及处理函数：

import datetime#获取当前时间a = datetime.datetime.now()print a2017-06-05 16:26:11.957000

# 当前时间加上半小时b = a + datetime.timedelta(hours = 0.5)print b2017-06-05 16:56:11.957000

# 格式化字符串输出c = b.strftime('%Y-%m-%d %H:%M:%S')print c2017-06-05 16:56:11