TL;DR – The Python time module lets you represent time in objects, numbers, and strings, as well as perform other useful tasks.
Preparing to work with Python time
To be able to work with time in Python, you need to first import the module:
time module allows you to work with all time-related functions. Most of them simply call the platform C library functions that have the same name. However, there might be small differences between different platforms. The
time module is available in all versions of Python.
Understanding time in Python: the epoch
The most basic function in the Python
time module is
seconds = time.time() print("It's", seconds, "seconds since the epoch.")
It returns a floating point value that represents the number of seconds that have passed since the epoch. The epoch is a a platform-dependent point where the time starts.
If you're unsure what is the epoch on the system you're using, use the
gmtime() function. It takes one argument (a number of seconds) and converts the time to a struct. If you define the number as zero, it will simply display the beginning of the epoch:
Converting Python time
gmtime() function returns the struct time in Coordinated Universal Time (UTC). If you need it in local time, use
localtime(). To get an opposite result, use
t = time.localtime(seconds) print("The struct_time is:", t) sec = time.mktime(t) print("The number of seconds is:", sec)
If you need the Python time represented in a string, use
asctime() (if you have a struct time) or
cttime() (if you have a floating point value). Both of these functions will return a Python timestamp:
t = (2020, 1, 13, 13, 18, 9, 0, 3, 0) date = time.asctime(t) seconds = time.time() date2 = time.ctime(seconds)
Using the Python time.sleep() function
time module also allows you to time the execution of your threads. To delay a certain process, use the Python
print("Hello.") time.sleep(3) print("It's been three seconds since we said hello.")
You only need to define one argument, which is a floating-point number. It represents the number of seconds to delay the action for.
Using the Python
time.sleep() function with a while loop, you can also create a basic digital clock:
while True: localtime = time.localtime() result = time.strftime("%I:%M:%S", localtime) print(result) time.sleep(1)
Python time: useful tips
- There are two more Python modules that help you deal with time and date:
calendarhandles the calendar-related functions, and
datetimelets you manipulate Python timestamps. You can also extend
dateutilpackage from PyPI.
- If you're working with multithreaded programs, remember that the Python
time.sleep()function only delays a single thread and not the whole process.