text: print('hello world')
  
  +def circumf(r):
  +'''calculate the circumference of a circle
  - input r: radius''':
  +	circ = 2 *pi*r
  +	return circ
  
  +def area(r):
  +"""Calculates the area based on radius r
  +input: r - radius
  +
  +output: a - area of the circle
  +"""
  +
  +    a = np.Pi * r ** 2
  +    return a
  
  
  
  
  
  