How to use the time library of Python
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1. Time stamp
Timestamp 1970.1.1 to the specified time to interval, in seconds
Import timeprint (time.time ())
Output:
1649834054.98593
Calculate the timestamp of an hour ago
# calculate the timestamp print (time.time ()-3600) one hour ago
Output:
1649830637.5699048
two。 Structured time object
Get the current time
# get current time st = time.localtime () print (type (st)) print (st)
Output:
Time.struct_time (tm_year=2022, tm_mon=4, tm_mday=13, tm_hour=15, tm_min=19, tm_sec=24, tm_wday=2, tm_yday=103, tm_isdst=0)
St is essentially a tuple meta-ancestor, which contains nine elements.
Print (f "Today is {st [0]}-{st [1]}-{st [2]}")
Output:
Today is 2022-4-13.
Print (f "Today is the week {st.tm_wday+1}")
The properties in this object are read-only, and we can only view them, not modify them:
St.tm_wday = 3
An error will be reported at this time:
Traceback (most recent call last):
File "/ Users/liuhuanhuan/PycharmProjects/Pytorch_frame/python/python basic Code exercise / time/01.py of python Standard Library", line 18, in
St.tm_wday = 3
AttributeError: readonly attribute
3. Formatted time string # formatted time string print (time.ctime ())
Output:
Wed Apr 13 15:28:25 2022
# strftime ("Y-%m-%d H:%M:%s") print (time.strftime ("Y-%m-%d H:%M:%S"))
Output:
2022-04-13 15:32:02
Print (time.strftime ("% Y year -% m month -% d% H:% M minutes:% S seconds"))
Output
2022-April-13 15:00: 32 minutes: 45 seconds
Print (time.strftime ("% Y years -% m months -% d% H:% M minutes:% S seconds% a") print ("% Y years -% m months -% d days% H:% M minutes:% S seconds% A") print ("% Y years -% m months -% d days% H:% M minutes:% S seconds% b") print (time.strftime ("% Y years -% Y years -% S seconds% b") M month -% d% H:% M minutes:% S seconds% B "))
Output:
2022-April-13 15:00: 34 minutes: 23 seconds Wed
2022-April-13 15:00: 34 minutes: 23 seconds Wednesday
2022-April-13 15:00: 34 minutes: 23 seconds Apr
2022-April-13 15:00: 34 minutes: 23 seconds April
Sleep, wait time
Print ("start") time.sleep (2) print ("end")
Calculation program calculation time:
T1 = time.time () print ("start") time.sleep (2) print ("end") T2 = time.time () print (f "interval {t2-t1}")
Output:
Start
End
Interval 2.005164861679077
4. Conversion between three formats
1. The timestamp is converted to the object's
# the two effects are the same print (time.gmtime ()) print (time.gmtime (time.time ()) print (time.localtime ()) print (time.localtime (time.time ()-3600))
Output
Time.struct_time (tm_year=2022, tm_mon=4, tm_mday=13, tm_hour=7, tm_min=42, tm_sec=26, tm_wday=2, tm_yday=103, tm_isdst=0)
Time.struct_time (tm_year=2022, tm_mon=4, tm_mday=13, tm_hour=7, tm_min=42, tm_sec=26, tm_wday=2, tm_yday=103, tm_isdst=0)
Time.struct_time (tm_year=2022, tm_mon=4, tm_mday=13, tm_hour=15, tm_min=42, tm_sec=26, tm_wday=2, tm_yday=103, tm_isdst=0)
Time.struct_time (tm_year=2022, tm_mon=4, tm_mday=13, tm_hour=14, tm_min=42, tm_sec=26, tm_wday=2, tm_yday=103, tm_isdst=0)
2.# structured object conversion timestamp
# structured object to timestamp print (time.time ()) print (time.mktime (time.localtime ()
Output:
1649835895.358733
1649835895.0
3. Structured object to time string
# structured object to time string print (time.strftime ("% Y-%m-%d% H:%m:%S", time.localtime ()) print (time.strftime ("% Y-%m-%d% H:%m:%S", time.gmtime (time.time ()
Output:
2022-04-13 15:04:20
2022-04-13 07:04:20
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