module

redd

1. import math
   
2. print math.sqrt(25)

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或

1. from math import sqrt
   
2. print sqrt(25)

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或

1. from math import *

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redd

1. import math
   
2. 
   
3. everything = dir(math)
   
4. 
   
5. print everything

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redd

1. from math import sqrt
   
2. print sqrt(13689)

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