Use time library
- time library is a standard library python in processing time
- Use
import timeandtime.<b>()call the formats you can use
Action : Expression of computer time; providing a system time and output formatting functions; providing system-level precision timing functions, performance analysis can be used to
time library contains three types of functions:
- Time acquisition: time (), ctime (), gmtime ()
- Time Format: strftime (), strptime ()
- Timing the application: sleep (), perf_counter ()
Time to get
- Timestamp: refers to the current system time stamp representing a floating-point time, is the time value of the internal computer
- time () function: Get the current timestamp, returns a string of long float
- the ctime () Function: Get the current time and is readable manner, said returns a string. E.g
Sun Feb 9 13:50:13 2020 - gmtime, () Function: Get the current time, the time expressed as machine-processable format (struct_time format)
Time Format
- Time format is the time to show up at a reasonable ways
- Similar to the string formatting (.format), need to show template
- Display format template by the particular control specifier
strftime function
strftime function takes two parameters
- tpl parameter string format template that defines the output effect
- ts is the computer's internal Time Tag Type
Examples :
>>> t=time.gmtime()
>>> time.strftime("%Y-%m-%d %H:%M:%S",t)Can output'2020-02-09 08:30:48'
Format string
strptime function
- strptime strftime function and are complementary
- Can be a string into a computer's internal time can be operated
- Str string parameter is a time value, TPL formatted template string, to define the effect of input
For example :
>>> timestr="2019-02-09 17:03:20"
>>> time.strptime(timestr,"%Y-%m-%d %H:%M:%S")结果为：time.struct_time(tm_year=2019, tm_mon=2, tm_mday=9, tm_hour=17, tm_min=3, tm_sec=20, tm_wday=5, tm_yday=40, tm_isdst=-1)
Program timing applications
- Timing the application means during operation of the measurement start and end time experienced by
- For example a program from the beginning to the end run gone much time, called the program timing
- Timing the application including measurement time and generation time of two parts
- Time measuring means is capable of recording the passage of time
Measurement time: perf_counter ()
- You can get its CPU clock frequency operation, high accuracy
Generation time: sleep ()
- Can let the program sleep or have a certain time
