Python Function Problems

# This program will contain two functions, slope and intercept
  2 # slope_intercept.py
  3
  4 import math
  5
  6 def slope(x1,y1,x2,y2):
  7     """This function finds the slope of a line (int or float format)"""
  8     rise = (y2 - y1)
  9     run = (x2 - x1)
 10     slope = (rise / run)
 11     if type(slope) == float: #checks to see if numbers are int or float
 12         return round(slope,2)
 13     else:
 14         return slope
 15
 16 def intercept(x1,y1,slope):
 17     """This function figures the y-intercept of a line"""
 18     a = slope * x1
 19     intercept = y1 - a
 20     return intercept
 21
 22 def main():
 23
 24     print("Enter the first set of point coordinates separated by a comma. ")
 25     x1,y1 = input()
 26     print("Enter the second set of point coordinates separated by a comma. ")
 27     x2,y2 = input()
 28     print("The slope of those coordinates is: ") , slope(x1,y1,x2,y2)
 29     print("The y-intercept of that line is: ") , intercept(x1,y1,slope)
 ,30
 31
 32 if __name__ == "__main__":
 33     main()