问题描述:
Write a function to find the volume of a cylinder.

测试用例:
['assert volume_cylinder(10,5)==1570.7500000000002', 'assert volume_cylinder(4,5)==251.32000000000002', 'assert volume_cylinder(4,10)==502.64000000000004']

生成的代码:
import math

def volume_cylinder(radius, height):
    return math.pi * (radius ** 2) * height