time模块

time.py
Functions:

time() -- return current time in seconds since the Epoch as a float  # 1970-01-01 00:00:00

>>> time.time()
1462459975.1511018

clock() -- return CPU time since process start as a float

>>> time.clock()
9.777779019400511e-06
>>> time.clock()
0.9610759887080621
>>> time.clock()
1.856179835705376

sleep() -- delay for a number of seconds given as a float
gmtime() -- convert seconds since Epoch to UTC tuple

>>> time.gmtime()
time.struct_time(tm_year=2016, tm_mon=5, tm_mday=5, tm_hour=14, tm_min=56, tm_sec=23, tm_wday=3, tm_yday=126, tm_isdst=0)
>>> time.gmtime(0)
time.struct_time(tm_year=1970, tm_mon=1, tm_mday=1, tm_hour=0, tm_min=0, tm_sec=0, tm_wday=3, tm_yday=1, tm_isdst=0)
>>> time.gmtime(1)
time.struct_time(tm_year=1970, tm_mon=1, tm_mday=1, tm_hour=0, tm_min=0, tm_sec=1, tm_wday=3, tm_yday=1, tm_isdst=0)

>>> time.gmtime(1).tm_mon
1

localtime() -- convert seconds since Epoch to local time tuple

>>> time.localtime()
time.struct_time(tm_year=2016, tm_mon=5, tm_mday=5, tm_hour=22, tm_min=57, tm_sec=51, tm_wday=3, tm_yday=126, tm_isdst=0)
>>> time.localtime(0)
time.struct_time(tm_year=1970, tm_mon=1, tm_mday=1, tm_hour=8, tm_min=0, tm_sec=0, tm_wday=3, tm_yday=1, tm_isdst=0)

asctime() -- convert time tuple to string  # 把time tuple（手写）类型或struct_time（也是time tuple）类型转换为字符串，时间为本地时间

>>> time.asctime()
'Thu May 5 23:03:19 2016'
>>> time.asctime(1)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: Tuple or struct_time argument required
>>> time.asctime((1,))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: function takes exactly 9 arguments (1 given)
>>> time.asctime((1970,1,1,1,1,1,1,1,1))
'Tue Jan 1 01:01:01 1970'
>>> time.asctime(time.localtime(121231234124))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
OSError: [Errno 22] Invalid argument
>>> time.asctime(time.localtime(1212312341))
'Sun Jun 1 17:25:41 2008'

>>> type(time.asctime())
<class 'str'>

ctime() -- convert time in seconds to string  # 把秒转换为字符串，时间为本地时间

>>> time.ctime()
'Thu May 5 23:05:38 2016'
>>> time.ctime(1)
'Thu Jan 1 08:00:01 1970'
>>> type(time.ctime(1))
<class 'str'>

mktime() -- convert local time tuple to seconds since Epoch

>>> time.mktime(time.localtime())
1462460940.0

strftime() -- convert time tuple to string according to format specification  # 把time tuple转为为指定格式的字符串

>>> time.strftime("%Y%m")
'201605'
>>> time.strftime("%Y%m",time.localtime())
'201605'
>>> time.strftime("%Y%m",time.localtime(1))
'197001'

strptime() -- parse string to time tuple according to format specification    # 把时间格式化的字符串转换为time tuple

>>> time.strptime("20111111","%Y%m%d")
time.struct_time(tm_year=2011, tm_mon=11, tm_mday=11, tm_hour=0, tm_min=0, tm_sec=0, tm_wday=4, tm_yday=315, tm_isdst=-1)

tzset() -- change the local timezone
"""

time.py源码

 # encoding: utf-8
# module time
# from (built-in)
# by generator 1.138
"""
This module provides various functions to manipulate time values.

There are two standard representations of time.  One is the number
of seconds since the Epoch, in UTC (a.k.a. GMT).  It may be an integer
or a floating point number (to represent fractions of seconds).
The Epoch is system-defined; on Unix, it is generally January 1st, 1970.
The actual value can be retrieved by calling gmtime(0).

The other representation is a tuple of 9 integers giving local time.
The tuple items are:
year (including century, e.g. 1998)
month (1-12)
day (1-31)
hours (0-23)
minutes (0-59)
seconds (0-59)
weekday (0-6, Monday is 0)
Julian day (day in the year, 1-366)
DST (Daylight Savings Time) flag (-1, 0 or 1)
If the DST flag is 0, the time is given in the regular time zone;
if it is 1, the time is given in the DST time zone;
if it is -1, mktime() should guess based on the date and time.

Variables:

timezone -- difference in seconds between UTC and local standard time
altzone -- difference in  seconds between UTC and local DST time
daylight -- whether local time should reflect DST
tzname -- tuple of (standard time zone name, DST time zone name)

Functions:

time() -- return current time in seconds since the Epoch as a floatclock() -- return CPU time since process start as a floatsleep() -- delay for a number of seconds given as a float
gmtime() -- convert seconds since Epoch to UTC tuplelocaltime() -- convert seconds since Epoch to local time tuple
asctime() -- convert time tuple to string
ctime() -- convert time in seconds to stringmktime() -- convert local time tuple to seconds since Epoch
strftime() -- convert time tuple to string according to format specification
strptime() -- parse string to time tuple according to format specification
tzset() -- change the local timezone
"""
# no imports

# Variables with simple values

altzone = -32400

daylight = 0

timezone = -28800

_STRUCT_TM_ITEMS = 9

# functions

def asctime(p_tuple=None): # real signature unknown; restored from __doc__
"""
asctime([tuple]) -> string

Convert a time tuple to a string, e.g. 'Sat Jun 06 16:26:11 1998'.
When the time tuple is not present, current time as returned by localtime()
is used.
"""
return ""

def clock(): # real signature unknown; restored from __doc__
"""
clock() -> floating point number

Return the CPU time or real time since the start of the process or since
the first call to clock().  This has as much precision as the system
records.
"""
return 0.0

def ctime(seconds=None): # known case of time.ctime
"""
ctime(seconds) -> string

Convert a time in seconds since the Epoch to a string in local time.
This is equivalent to asctime(localtime(seconds)). When the time tuple is
not present, current time as returned by localtime() is used.
"""
return ""

def get_clock_info(name): # real signature unknown; restored from __doc__
"""
get_clock_info(name: str) -> dict

Get information of the specified clock.
"""
return {}

def gmtime(seconds=None): # real signature unknown; restored from __doc__
"""
gmtime([seconds]) -> (tm_year, tm_mon, tm_mday, tm_hour, tm_min,
tm_sec, tm_wday, tm_yday, tm_isdst)

Convert seconds since the Epoch to a time tuple expressing UTC (a.k.a.
GMT).  When 'seconds' is not passed in, convert the current time instead.

If the platform supports the tm_gmtoff and tm_zone, they are available as
attributes only.
"""
pass

def localtime(seconds=None): # real signature unknown; restored from __doc__
"""
localtime([seconds]) -> (tm_year,tm_mon,tm_mday,tm_hour,tm_min,
tm_sec,tm_wday,tm_yday,tm_isdst)

Convert seconds since the Epoch to a time tuple expressing local time.
When 'seconds' is not passed in, convert the current time instead.
"""
pass

def mktime(p_tuple): # real signature unknown; restored from __doc__
"""
mktime(tuple) -> floating point number

Convert a time tuple in local time to seconds since the Epoch.
Note that mktime(gmtime(0)) will not generally return zero for most
time zones; instead the returned value will either be equal to that
of the timezone or altzone attributes on the time module.
"""
return 0.0

def monotonic(): # real signature unknown; restored from __doc__
"""
monotonic() -> float

Monotonic clock, cannot go backward.
"""
return 0.0

def perf_counter(): # real signature unknown; restored from __doc__
"""
perf_counter() -> float

Performance counter for benchmarking.
"""
return 0.0

def process_time(): # real signature unknown; restored from __doc__
"""
process_time() -> float

Process time for profiling: sum of the kernel and user-space CPU time.
"""
return 0.0

def sleep(seconds): # real signature unknown; restored from __doc__
"""
sleep(seconds)

Delay execution for a given number of seconds.  The argument may be
a floating point number for subsecond precision.
"""
pass

def strftime(format, p_tuple=None): # real signature unknown; restored from __doc__
"""
strftime(format[, tuple]) -> string

Convert a time tuple to a string according to a format specification.
See the library reference manual for formatting codes. When the time tuple
is not present, current time as returned by localtime() is used.

Commonly used format codes:

%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.

Other codes may be available on your platform.  See documentation for
the C library strftime function.
"""
return ""

def strptime(string, format): # real signature unknown; restored from __doc__
"""
strptime(string, format) -> struct_time

Parse a string to a time tuple according to a format specification.
See the library reference manual for formatting codes (same as
strftime()).

Commonly used format codes:

%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.

Other codes may be available on your platform.  See documentation for
the C library strftime function.
"""
return struct_time

def time(): # real signature unknown; restored from __doc__
"""
time() -> floating point number

Return the current time in seconds since the Epoch.
Fractions of a second may be present if the system clock provides them.
"""
return 0.0

# classes

class struct_time(tuple):
"""
The time value as returned by gmtime(), localtime(), and strptime(), and
accepted by asctime(), mktime() and strftime().  May be considered as a
sequence of 9 integers.

Note that several fields' values are not the same as those defined by
the C language standard for struct tm.  For example, the value of the
field tm_year is the actual year, not year - 1900.  See individual
fields' descriptions for details.
"""
def __init__(self, *args, **kwargs): # real signature unknown
pass

@staticmethod # known case of __new__
def __new__(*args, **kwargs): # real signature unknown
""" Create and return a new object.  See help(type) for accurate signature. """
pass

def __reduce__(self, *args, **kwargs): # real signature unknown
pass

def __repr__(self, *args, **kwargs): # real signature unknown
""" Return repr(self). """
pass

tm_hour = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default
"""hours, range [0, 23]"""

tm_isdst = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default
"""1 if summer time is in effect, 0 if not, and -1 if unknown"""

tm_mday = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default
"""day of month, range [1, 31]"""

tm_min = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default
"""minutes, range [0, 59]"""

tm_mon = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default
"""month of year, range [1, 12]"""

tm_sec = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default
"""seconds, range [0, 61])"""

tm_wday = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default
"""day of week, range [0, 6], Monday is 0"""

tm_yday = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default
"""day of year, range [1, 366]"""

tm_year = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default
"""year, for example, 1993"""

n_fields = 9
n_sequence_fields = 9
n_unnamed_fields = 0

class __loader__(object):
"""
Meta path import for built-in modules.

All methods are either class or static methods to avoid the need to
instantiate the class.
"""
@classmethod
def create_module(cls, *args, **kwargs): # real signature unknown
""" Create a built-in module """
pass

@classmethod
def exec_module(cls, *args, **kwargs): # real signature unknown
""" Exec a built-in module """
pass

@classmethod
def find_module(cls, *args, **kwargs): # real signature unknown
"""
Find the built-in module.

If 'path' is ever specified then the search is considered a failure.

This method is deprecated.  Use find_spec() instead.
"""
pass

@classmethod
def find_spec(cls, *args, **kwargs): # real signature unknown
pass

@classmethod
def get_code(cls, *args, **kwargs): # real signature unknown
""" Return None as built-in modules do not have code objects. """
pass

@classmethod
def get_source(cls, *args, **kwargs): # real signature unknown
""" Return None as built-in modules do not have source code. """
pass

@classmethod
def is_package(cls, *args, **kwargs): # real signature unknown
""" Return False as built-in modules are never packages. """
pass

@classmethod
def load_module(cls, *args, **kwargs): # real signature unknown
"""
Load the specified module into sys.modules and return it.

This method is deprecated.  Use loader.exec_module instead.
"""
pass

def module_repr(module): # reliably restored by inspect
"""
Return repr for the module.

The method is deprecated.  The import machinery does the job itself.
"""
pass

def __init__(self, *args, **kwargs): # real signature unknown
pass

__weakref__ = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default
"""list of weak references to the object (if defined)"""

__dict__ = None # (!) real value is ''

# variables with complex values

tzname = (
'Öйú±ê׼ʱ¼ä',
'ÖйúÏÄÁîʱ',
)

__spec__ = None # (!) real value is ''