If you have read the
import statements wiki then you’d have seen me use this statement in one of the examples. Today, we’ll try to understand what it does
So picking up the same example:
>>> from math import ceil, sqrt >>> # here it would be >>> sqrt(36) <<< 6
Or we could use this:
>>> import math >>> # here it would be >>> math.sqrt(36) <<< 6
Then our code would look like
math.sqrt(x) instead of
sqrt(x). This happens because when we use
import x, a namespace
x is itself created to avoid name conflicts. You have to access every single object of the module as
x.<name>. But when we use
from x import y we agree to add
y to the main global namespace. So while using this we have to make sure that we don’t have an object with same name in our program.
from x import yif an object named
For example, in
os module there’s a method
open. But we even have a built-in function called
open. So, here we should avoid using
from os import open.
We can even use
form x import *, this would import all the methods, classes of that module to the global namespace of the program. This is a bad programming practice. Please avoid it.