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# -*- coding: UTF-8 -*-

# Filename : test.py
# author by : www.tutorialpro.org

a = float(input('Enter the length of the first side of the triangle: '))
b = float(input('Enter the length of the second side of the triangle: '))
c = float(input('Enter the length of the third side of the triangle: '))

# Calculate the semi-perimeter
s = (a + b + c) / 2

# Calculate the area
area = (s*(s-a)*(s-b)*(s-c)) ** 0.5
print('The area of the triangle is %0.2f' %area)

$ python test.py 
Enter the length of the first side of the triangle: 5
Enter the length of the second side of the triangle: 6
Enter the length of the third side of the triangle: 7
The area of the triangle is 14.70