L3·Functions & Modules

📦Modules & Imports

Organizing code across files.

importfrompackage__init__

import math, from math import sqrt, from math import sqrt as s, import math as m.

A directory with __init__.py (optional in 3.3+) is a package. Sub-modules via dotted paths.

Idiomatic guard: code inside runs only when the module is executed directly, not on import.

Example

1import math
2from math import pi, sqrt
3
4print(math.tau)
5print(sqrt(pi))
6
7if __name__ == '__main__':
8    print('run directly')

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Question 1 / 2

Which imports sqrt directly?