Imports & Your Own Modules
beginner12 min readLesson 36 of 169
import vs from-import, prefix discipline, and any .py file is a module.
An import makes code from another file available in yours:
import math
print(math.sqrt(144)) # 12.0 — note the module NAME prefix
The prefix is the point: every use shows where the function came from. from import copies specific names out:
from math import sqrt
print(sqrt(144)) # 12.0 — no prefix, but the origin is less visible
For a beginner, prefer plain import math: readers can trace every name, and
imports at the top of the file form a table of contents. Reserve from import
for long module names or very frequent use.