#!/usr/bin/env python

# -*- coding: utf-8 -*-

# Triangle Project Code.

# triangle(a, b, c) 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):

sides = [a, b, c]

diff_sides = len(set(sides))

if not min([a, b, c]) > 0:

raise TriangleError

# get max side and list of smaller sides and take care for equilateral triangles

big_side = sides.pop(sides.index(max(sides)))

if big_side >= sum(sides):

raise TriangleError

if diff_sides==1:

return 'equilateral'

elif diff_sides==2:

return 'isosceles'

elif diff_sides==3:

return 'scalene'

else:

print 'shouldn\'t be here'

# Error class used in part 2. No need to change this code.

class TriangleError(StandardError):

pass