Calculate area of a circle

[pythonuser1]

All you've done is define the function. You need to call it somewhere, supplying a value for the parameter rayon. You'll probably also want to print the value that the function returns...

Hello, thank you, like this ?

#!/usr/bin/python
from math import *
def aire(rayon):
A=pi*rayon**2
rayon=5
return(A)
print(A)

I still have nothing when I run python fonction.py

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note that star imports like from math import * are generally discouraged

Hello, thank you, how do we know by what should we replace the star ? Is there a list somewhere ?