datetime & time

python有两个和时间相关的模块，datetime和time

datetime

datetime模块下有四个类

• date　　     日期相关的
• time          时间相关的
• datetime    date和time两者的功能
• timedelta   时间差

date 

查看和设置日期

>>> d = datetime.date.today()
>>> d
datetime.date(2017, 4, 30)
>>> d.year, d.month, d.day        # 取年、月、日
(2017, 4, 30)
>>> d.weekday()                   # 星期几，从0开始算
6
>>> d.isoweekday()                # 星期几，从1开始算
7
>>> datetime.date(2017, 4, 17)    # 设置日期
datetime.date(2017, 4, 17)

time

构造时间

Help on class time in module datetime:

class time(builtins.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.
 |  
 |  Methods defined here:
 |  
 |  __eq__(self, value, /)
 |      Return self==value.
 |  
 |  __format__(...)
 |      Formats self with strftime.
 |  
 |  __ge__(self, value, /)
 |      Return self>=value.
 |  
 |  __getattribute__(self, name, /)
 |      Return getattr(self, name).
 |  
 |  __gt__(self, value, /)
 |      Return self>value.
 |  
 |  __hash__(self, /)
 |      Return hash(self).
 |  
 |  __le__(self, value, /)
 |      Return self<=value.
 |  
 |  __lt__(self, value, /)
 |      Return self<value.
 |  
 |  __ne__(self, value, /)
 |      Return self!=value.
 |  
 |  __new__(*args, **kwargs) from builtins.type
 |      Create and return a new object.  See help(type) for accurate signature.
 |  
 |  __reduce__(...)
 |      __reduce__() -> (cls, state)
 |  
 |  __reduce_ex__(...)
 |      __reduce_ex__(proto) -> (cls, state)
 |  
 |  __repr__(self, /)
 |      Return repr(self).
 |  
 |  __str__(self, /)
 |      Return str(self).
 |  
 |  dst(...)
 |      Return self.tzinfo.dst(self).
 |  
 |  isoformat(...)
 |      Return string in ISO 8601 format, [HH[:MM[:SS[.mmm[uuu]]]]][+HH:MM].
 |      
 |      timespec specifies what components of the time to include.
 |  
 |  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:
 |  
 |  fold
 |  
 |  hour
 |  
 |  microsecond
 |  
 |  minute
 |  
 |  second
 |  
 |  tzinfo
 |  
 |  ----------------------------------------------------------------------
 |  Data and other attributes defined here:
 |  
 |  max = datetime.time(23, 59, 59, 999999)
 |  
 |  min = datetime.time(0, 0)
 |  
 |  resolution = datetime.timedelta(0, 0, 1)

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time