Basic introduction to the time library
expression of computer time
Provides the function of getting the system time and formatting the output
Provides system-level precise timing for program performance analysis
usage import time
time acquisition| function | describe |
| time() | Get the current timestamp, that is, the computer's internal time value, a floating-point number such as: time.time() returns 154564641.1566853 is the second counted from 1970 |
| ctime() | Get the current time and represent it in a human-readable way, return a string such as: time.ctime() "Fri Apr 13 23:59:37 2018" |
| gmtime () | Get the current time, expressed as the time format currently processed by the computer, such as: time.gmtime() The result is time.struct_time(tm_year=2018, tm_mon=4, tm_mday=13, tm_hour=16, tm_min=1, tm_sec=36, tm_wday=4, tm_yday=103, tm_isdst=0) ( Why is the time obtained by gmtime() not the current time ) |
time formatting
| function | describe |
| strftime.(tpl,ts) | tpl is a formatted template string, used to define the output effect, ts is the computer's internal time type variable >>>t = time.gmtime() >>>time.strftime("%Y-%m-%d %H: %M%s:",t) >>>'2018-04-13 16:08:18' |
| strptime(str,tpl) | str is the time value in the form of a string tpl is the string of the format template, which is used to define the structure of the time returned by the input effect, which is the inverse of strftime() |
Program timing application
| function | describe |
| perf_counter() | Returns a CPU-level precise time count value in seconds, a floating-point number, and the difference between two times is the time in it |
| sleep（s） | program waits s seconds |