Python Module

# You can import modules

import math

print(math.sqrt(16))  # => 4.0



# You can get specific functions from a module

from math import ceil, floor

print(ceil(3.7))   # => 4.0

print(floor(3.7))  # => 3.0



# You can import all functions from a module.

# Warning: this is not recommended

from math import *



# You can shorten module names

import math as m

math.sqrt(16) == m.sqrt(16)  # => True



# Python modules are just ordinary python files. You

# can write your own, and import them. The name of the

# module is the same as the name of the file.



# You can find out which functions and attributes

# defines a module.

import math

dir(math)



# If you have a Python script named math.py in the same

# folder as your current script, the file math.py will

# be loaded instead of the built-in Python module.

# This happens because the local folder has priority

# over Python's built-in libraries.