Explain calendar module in python?

Python has an inbuilt module and imports all the classes and functions in the module.

Example

#Write a python program to print month of a calendar?
import calendar
#prints may month calendar
print(calendar.month(2019,5))

Output

May 2019
Mo Tu We Th Fr Sa Su
1 2 3 4 5
6 7 8 9 10 11 12
13 14 15 16 17 18 19
20 21 22 23 24 25 26
27 28 29 30 31