Python uses . to mean “part of”. Using math , one of the modules in the standard library: import math print('pi is', math.pi) print('cos(pi) is', ... ... <看更多>

Did you import the math module with import math ? – BrenBarn. Sep 17 '13 at 5:11. Add a comment ... ... <看更多>

Last, you'll see how to work with datasets in Python -- collections of data, ... with things like pi in it and then assigns the name math to that module. ... <看更多>

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但更簡單明瞭。 Python 2. 使用 reload 功能：. Python 2.x >= 2.3. placeholderCopy import math math.pi = 3 print( ... ... <看更多>