import math vs from math import sqrt

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Accepted Answer

'import math' binds the name 'math' in your namespace. You access everything through that name as math.sqrt, math.pi, and so on. 'from math import sqrt' pulls sqrt directly into your namespace, so you call it as sqrt(x) without a prefix. The module is loaded the same way in both cases - the difference is only which names land in your local namespace. Prefer 'import math' in larger files so readers always know where a function came from. Use 'from ... import' when you need a name constantly and the source is obvious from context.