Python Learning Notes (5) using the-time library

Import time

One, time acquisition function

Time (), CTime (), Gmtime ()

>>> Import Time>>> Time. Time()1524297783.3058376>>> Time. CTime ()'Sat Apr 16:03:09 2018'>>> Time. Gmtime () Time. Struct_time (tm_year=2018, tm_mon=4, tm_mday= +, tm_hour=8, tm_min=4, tm_sec=6, tm_wday=5, tm_yday=111, tm_isdst=0)

Second, the time of the format

The Strftime (TPL, TS) TPL is a time-formatted template string used to define the output effect, and TS is the machine's internal time-type variable.

>>> t=time gmtime ()time strftime ("%y-%m-%d%h:%m:%s"  , T)'2018-04-21 08:05:49'

%Y   year %m  month %B   month name January%B   month name abbreviation  Jan%D   Date %a   week Monday%a   week abbreviation Mon%H   %H   p   last afternoon %M  minutes %s   seconds

Examples are as follows:

>>> Time. Strftime ("%y-%b-%d-%a-%h-%p-%s")'2018-april-21-saturday-16-pm-10'>>> Time. Strftime ("%a-%p")'saturday-pm'>>> Time. Strftime ("%m:%s")'15:39'>>> Time. Strftime ("%m:%s")'15:45'>>> Time. Strftime ("%m:%s", T)'05:49'

If Strftime does not have a second argument, the current time is obtained by default.

Strptime (Timestr, "%y-%m-%d%h:%m:%s") is converted to a struct based on the time string and the formatted output.

>>> timestr'2018-01-26 12:55:33'time. Strptime (Timestr,  "%y-%m-%d%h:%m:%s")time. Struct_time (tm_year=2018, tm_mon= 1, tm_mday=, tm_hour=,tm_min=, tm_sec=, tm_wday= 4, tm_yday=, tm_isdst=-1)

Third, the timing of the program

Measurement time: Perf_counter () returns the exact time count value of a CPU level, which is good, since the starting point of this count value is not deterministic, successive calls using the difference are meaningful.

>>> start=timeperf_counter ()>>> start3.9111116077602044e-06 >>> end=timeperf_counter ()>>> end10.212393474589648 >>> End- start10.212389563478041

Generation time: Sleep (s) s wonderful sleep time, can be a floating point number, such as time.sleep (3.5)

Here is an example of a Time progress bar:

#TextProBarV3. Pyimport Time Scale= -Print ("Start". Center (Scale//2, "-"))Start = Time. Perf_counter () forIinchRange (Scale +1): A="*"*I b="."* (Scale-i) C= (i/scale) * -dur= Time. Perf_counter ()-Start Print ("\r{:^3.0f}%[{}->{}]{:.2f}s". Format (C,a,b,dur), end=""" here \ r, cursor back to the beginning of the line, end=" "means no output space, string continuous output ' ' Time.Sleep(0.1) Print ("\ n"+"End". Center (Scale//2, "-"))

Python Learning Notes (5) using the-time library