The time library is a standard library for processing time in python, which mainly has the following three functions:
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Expression of computer time
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Get system time and format output
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System and precise timing for program performance analysis
The time library mainly includes three types of functions:
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Time acquisition: time() ctime() gtime()
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Time formatting: strftime() strptime()
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Program timing: sleep() perf_counter()
Time acquisition
| function | description |
|---|---|
| time() | Get the current computer internal time value, which is a floating point number with extremely high precision >>>time.time() 1516939876.6022282 |
| ctime() | Get the current time and return a readable string >>>time.ctime() 'Tues Apr 24 23:11:16 2018' |
| gmtime () | Get the current time, expressed as a format that the computer can handle >>time.gmtime() time.struct_time(tm_year=2018, tm_mon=4, tm_mday=24, tm_hour=23, tm_min=11, tm_sec=16, tm_wday=4, tm_yday=26, tm_isdst=0) |
Time formatting
| function | description |
|---|---|
| strftime(tpl, ts) | Display the time in a reasonable way. tpl is a formatted template string used to control the output format, and ts is a computer internal time variable >>>t = time.gmtime() >>>time.strftime("%Y- %m-%d %H:%M:%S", t) '2018-04-24 23:21:28' |
| strptime(str, tpl) | Contrary to the strftime() function, it converts the formatted time string into a format that can be processed by the computer >>>timeStr = '2018-04-24 23:21:28' >>>time,strptime(timeStr, "% Y-%m-%d %H:%M:%S”) time.struct_time(tm_year=2018, tm_mon=4, tm_mday=24, tm_hour=23, tm_min=21, tm_sec=28, tm_wday=4, tm_yday =26, tm_isdst=0) |
Program timing
| function | description |
|---|---|
| sleep(s) | s is the sleep time, in seconds >>>time.sleep(3.3) #The program will sleep for 3.3 seconds |
| perf_counter() | Returns a CPU-level accurate time count value in seconds. Since the starting point of the count is uncertain, the difference between continuous counts is generally meaningful >>>start = time.perf_counter() >>>stop = time.perf_counter() > >>stop-start 22.563765376384787 |