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triangle.py
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42 lines (38 loc) · 1.15 KB
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Triangle Project Code.
# Triangle analyzes the lengths of the sides of a triangle
# (represented by a, b and c) and returns the type of triangle.
#
# It returns:
# 'equilateral' if all sides are equal
# 'isosceles' if exactly 2 sides are equal
# 'scalene' if no sides are equal
#
# The tests for this method can be found in
# about_triangle_project.py
# and
# about_triangle_project_2.py
#
def triangle(a, b, c):
'Given 3 side lengths, returns the type of triangle, \
raises TriangleError if the inputs do not form a triangle'
if (a and b and c > 0) and triTest(a, b, c):
if a == b == c:
return 'equilateral'
elif a == b or b == c or c == a:
return 'isosceles'
else:
return 'scalene'
else:
raise TriangleError
def triTest(*args):
'Checks that the sides provided create a closed figure \
with a contained area'
sides = sorted(args)
if sides[0] + sides[1] <= sides[2]:
return False
return True
# Error class used in part 2. No need to change this code.
class TriangleError(Exception):
pass