#!/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):
    # DELETE 'PASS' AND WRITE THIS CODE
    pass


# Error class used in part 2.  No need to change this code.
class TriangleError(StandardError):
    pass

#!/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 _is_valid_triangle(a, b, c):
    if (a <=0 ) or (b <=0 ) or (c <= 0):
        raise TriangleError('Triangle must be made of positive values')

def triangle(a, b, c):
    # DELETE 'PASS' AND WRITE THIS CODE
    if min([a,b,c])<=0:
        raise TriangleError
    x,y,z = sorted([a,b,c])
    if x+y<=z:
        raise TriangleError
    
    else:

        if a == b and b == c and c == a:
            return 'equilateral'
    
        if a == b or b == c or a == c:
            return 'isosceles'
    
        else:
            return 'scalene'


# Error class used in part 2.  No need to change this code.
class TriangleError(StandardError):
    pass

Update triangle.py