time模塊 time模塊提供各種操作時間的函數 #1、時間戳 1970年1月1日之後的秒 #2、元組 包含了：年、日、星期等... time.struct_time #3、格式化的字元串 2014-11-11 11:11 （1）asctime(p_tuple=None) def asctime(p ...
time模塊
time模塊提供各種操作時間的函數
#1、時間戳 1970年1月1日之後的秒
#2、元組 包含了：年、日、星期等... time.struct_time
#3、格式化的字元串 2014-11-11 11:11
（1）asctime(p_tuple=None)
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 ""
asctime()返回當前系統的時間，如下：
>>> time.asctime()
'Sun May 28 13:32:04 2017'
（2）clock()
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
clock()返回CPU系統當前的時間，或者真實時間，從開始到第一次使用clock()。
>>> time.clock()
0.44741
（3）clock_getres(clk_id)
def clock_getres(clk_id): # real signature unknown; restored from __doc__
"""
clock_getres(clk_id) -> floating point number
Return the resolution (precision) of the specified clock clk_id.
"""
return 0.0
（4）clock_gettime(clk_id)
def clock_gettime(clk_id): # real signature unknown; restored from __doc__
"""
clock_gettime(clk_id) -> floating point number
Return the time of the specified clock clk_id.
"""
return 0.0
（5）clock_settime(clk_id,time)
def clock_settime(clk_id, time): # real signature unknown; restored from __doc__
"""
clock_settime(clk_id, time)
Set the time of the specified clock clk_id.
"""
pass
（6）ctime(seconds=None)
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 ""
ctime()返回系統當前的時間：
>>> time.ctime()
'Sun May 28 13:55:39 2017'
（7）get_clock_info(name)
def get_clock_info(name): # real signature unknown; restored from __doc__
"""
get_clock_info(name: str) -> dict
Get information of the specified clock.
"""
return {}
（8）gmtime(seconds=None)
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
gmtime(seconds=None)返回對應的時間格式，time.struct_time。
>>> time.gmtime()
time.struct_time(tm_year=2017, tm_mon=5, tm_mday=28, tm_hour=6, tm_min=1, tm_sec=28, tm_wday=6, tm_yday=148, tm_isdst=0)
（9）localtime(seconds=None) 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
localtime()返回時間time.struct_time格式的日期。
>>> time.localtime()
time.struct_time(tm_year=2017, tm_mon=5, tm_mday=28, tm_hour=14, tm_min=3, tm_sec=58, tm_wday=6, tm_yday=148, tm_isdst=0)
（10）mktime()
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
（11）monotonic()
def monotonic(): # real signature unknown; restored from __doc__
"""
monotonic() -> float
Monotonic clock, cannot go backward.
"""
return 0.0
>>> time.monotonic()
27333.713613735
（12）perf_counter()
def perf_counter(): # real signature unknown; restored from __doc__
"""
perf_counter() -> float
Performance counter for benchmarking.
"""
return 0.0
>>> time.perf_counter()
27418.099319872
（13）process_time()
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
>>> time.process_time()
0.521978947
（14）sleep(seconds)
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
time.sleep(seconds)是程式停止運行一段時間。休眠。例如time.sleep(10)代表程式停止等待10秒鐘。
（15）strftime(format,p_tuple=None)
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 ""
strftime(format,p_tuple)將時間進行格式轉換，只能轉換localtime()和gmtime()的struct_time格式時間情況；
>>> time.strftime("%Y-%m-%d %p",time.localtime())
'2017-05-28 PM'
>>> time.strftime("%Y-%m-%d %I:%M:%S%p",time.localtime())
'2017-05-28 02:23:21PM'
日期格式的轉換，只能轉換struct_time的格式；
>>> time.strftime("%a",time.localtime()) %a返回星期的簡寫
'Sun'
>>> time.strftime("%A",time.localtime()) %A返回日期的全拼
'Sunday'
（16）strptime(string,format)
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
strptime(string,format)將字元串的日期類型轉化為struct_time類型。
>>> time.strptime("2017-5-18","%Y-%m-%d")
time.struct_time(tm_year=2017, tm_mon=5, tm_mday=18, tm_hour=0, tm_min=0, tm_sec=0, tm_wday=3, tm_yday=138, tm_isdst=-1)
（17）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
time()返回浮點數。
>>> time.time()
1495953536.3603268
（18）tzset()
def tzset(): # real signature unknown; restored from __doc__
"""
tzset()
Initialize, or reinitialize, the local timezone to the value stored in
os.environ['TZ']. The TZ environment variable should be specified in
standard Unix timezone format as documented in the tzset man page
(eg. 'US/Eastern', 'Europe/Amsterdam'). Unknown timezones will silently
fall back to UTC. If the TZ environment variable is not set, the local
timezone is set to the systems best guess of wallclock time.
Changing the TZ environment variable without calling tzset *may* change
the local timezone used by methods such as localtime, but this behaviour
should not be relied on.
"""
pass
datetime模塊
"""
import datetime
datetime.date：表示日期的類。常用的屬性有year, month, day
datetime.time：表示時間的類。常用的屬性有hour, minute, second, microsecond
datetime.datetime：表示日期時間
datetime.timedelta：表示時間間隔，即兩個時間點之間的長度
timedelta([days[, seconds[, microseconds[, milliseconds[, minutes[, hours[, weeks]]]]]]])
strftime("%Y-%m-%d")
"""
（1）datetime.date：表示日期的類。常用的屬性有year,month,day
>>> datetime.date.today()
datetime.date(2017, 5, 28)
返回日期的格式情況，包含的屬性有year(年)、month(月)、日(day)。
（2）datetime.time:表示時間的類。常用的屬性有hour,minute,second,microsecond
>>> datetime.time(12,30,59,99)
datetime.time(12, 30, 59, 99)
返回日期時間的格式情況，如datetime.time()
（3）datetime.datetime：表示日期時間
>>> datetime.datetime(2016,5,12,7,59,59,99)
datetime.datetime(2016, 5, 12, 7, 59, 59, 99)
>>> datetime.datetime.now()
datetime.datetime(2017, 5, 28, 15, 34, 1, 105235)
>>> datetime.datetime.today()
datetime.datetime(2017, 5, 28, 15, 35, 9, 384407)
（4）datetime.timedelta：表示時間間隔，兩個時間點之間的長度
（5）timedelta([days[, seconds[, microseconds[, milliseconds[, minutes[, hours[, weeks]]]]]]])
（6）strftime("%Y-%m-%d")
實例：
>>> now_date = datetime.datetime.now() + datetime.timedelta(days=10) （1）比現在日期多十天
>>> now_date
datetime.datetime(2017, 6, 7, 15, 37, 7, 936368)
>>> str_to_date = datetime.datetime.strptime("16/11/17 16:30","%d/%m/%y %H:%M") （2）將字元串時間格式化轉化為時間
>>> str_to_date
datetime.datetime(2017, 11, 16, 16, 30)
>>> new_date = datetime.datetime.now() + datetime.timedelta(hours=-10) （3）比現在時間少10個小時
>>> new_date
datetime.datetime(2017, 5, 28, 20, 1, 11, 805686)
