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This article introduces the knowledge of "how to use Python's time library". Many people will encounter such a dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

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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