Problem with importing in Python

[su29090]

I'm trying to import a python file it keeps saying:

ImportError: cannot import name Circle

Here is the file I'm trying to import:

Circle.py

import math

class circle:
    #Construct a circle object
    def __init__(self, radius = 1):
        self.radius = radius

    def getPerimeter(self):
        return 2 * self.radius * math.pi

    def getArea(self):
        return self.radius * self.radius * math.pi

    def setRadius(self, radius):
        self.radius = radius

from Circle import Circle

def main():
    #Create a circle with a radius 1
    circle1 = Circle()
    print("The area of the circle of radius",
          circle1.radius, "is" , circle1.getArea())

    #Create a circle with a radius 25
    circle2 = Circle(25)
    print("The area of the circle of radius",
          circle2.radius, "is" , circle2.getArea())

    #Create a circle with a radius 125
    circle3 = Circle(125)
    print("The area of the circle of radius",
          circle3.radius, "is" , circle3.getArea())

    #Modify circle radius 
    circle2.radius = 100 # or Circle2.setRadius(100)
    print("The area of the circle of radius",
          circle2.radius, "is" , circle2.getArea())

    main() # Call the main function

How can I solve this problem?

Thanks in advance.