Unit test failing please help

[lblake]

Hi I am new to python I am at bit lost as to why my unit test is
failing below is the code and the unit test:

class Centipede(object):
legs, stomach
def __init__(self):


def __str__(self):
return ','.join(self.stomach)


def __call__(self,*args):
[self.stomach.append(arg) for arg in args]
#self.stomach.append(args)

def __repr__(self):
return ','.join(self.legs)

def __setattr__(self, key, value):
print("setting %s to %s" % (key, repr(value)))
if key in ([]):
self.legs.append(key)
super(Centipede, self).__setattr__(self, key,value)

unit test code:

import unittest
from centipede import Centipede

class TestBug(unittest.TestCase):

def test_stomach(self):
ralph = Centipede()
ralph('chocolate')
ralph('bbq')
ralph('cookies')
ralph('salad')
self.assertEquals(ralph.__str__(),
'chocolate,bbq,cookies,salad')


def test_legs(self):
ralph = Centipede()
ralph.friends = ['Steve', 'Daniel', 'Guido']
ralph.favorite_show = "Monty Python's Flying Circus"
ralph.age = '31'

self.assertEquals(ralph.__repr__(),'<friends,favorite_show,age>' )



if __name__ == "__main__":
unittest.main()


error message generated when running the test:

AttributeError: 'Centipede' object has no attribute 'legs'

AttributeError: 'Centipede' object has no attribute 'stomach'

Any suggestions as to where I am going wrong?

 

[Tim Wintle]

Hi I am new to python I am at bit lost as to why my unit test is
failing below is the code and the unit test:

class Centipede(object):
legs, stomach

This doesn't do what you think it does.

"legs, stomach" is a statement and is not defining any variables at all.

Presumably you've also got variables named legs and stomach in the
module's scope - as I'd expect to see a NameError : name 'legs' is not
defined.

(I'd also expect a SyntaxError from having an empty __init__ function
body)

You probably want do write something like this:

class Centipede(object):
def __init__(self):
self.legs = []
self.stomach = []

 

[John Gordon]

Hi I am new to python I am at bit lost as to why my unit test is
failing below is the code and the unit test:

class Centipede(object):
legs, stomach

You aren't assigning any values to "legs" or "stomach" here. From your
later code, it seems like you intend these items to start out as empty
lists. This code might work better:

class Centipede(object):
legs = []
stomach = []

(In fact, since you aren't *assigning* anything to legs or stomach but
you're simply *referencing them*, this code should have been an error
because those names do not yet exist.)

def __init__(self):

This __init__() method does nothing at all. It doesn't even have a pass
statement, which means it isn't legal python. Your code should have
produced an error here.

def __setattr__(self, key, value):
print("setting %s to %s" % (key, repr(value)))
if key in ([]):
self.legs.append(key)
super(Centipede, self).__setattr__(self, key,value)

How will this if statement ever be true? You're checking if 'key' is
a member of an empty list.