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MaybeUndefinedClassAttribute.py

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class Spam:

def __init__(self):

self.spam = 'spam, spam, spam'

def set_eggs(eggs):

self.eggs = eggs

def __str__(self):

return '%s and %s' % (self.spam, self.eggs) # Maybe uninitialized attribute 'eggs'

#Fixed version

class Spam:

def __init__(self):

self.spam = 'spam, spam, spam'

self.eggs = None

def set_eggs(eggs):

self.eggs = eggs

def __str__(self):

return '%s and %s' % (self.spam, self.eggs) # OK