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    <p>The problem is that you're defining defining <code>vis</code> and <code>bags</code> as part of the class (as "attribute references"), instead of in the constructor. Try this instead:</p> <pre><code>class bfs: def __init__(self, x): self.vis = [] self.bags = [] # etc. </code></pre> <p>The <a href="http://docs.python.org/3/tutorial/classes.html#class-objects" rel="nofollow">documentation for class objects</a> may help:</p> <blockquote> <p>Attribute references use the standard syntax used for all attribute references in Python: obj.name. Valid attribute names are all the names that were in the class’s namespace when the class object was created. So, if the class definition looked like this:</p> <pre><code>class MyClass: """A simple example class""" i = 12345 def f(self): return 'hello world' </code></pre> <p>then MyClass.i and MyClass.f are valid attribute references, returning an integer and a function object, respectively. Class attributes can also be assigned to, so you can change the value of MyClass.i by assignment.</p> </blockquote> <p>There's also a <a href="http://www.diveintopython.net/object_oriented_framework/class_attributes.html" rel="nofollow">Dive Into Python page</a> about this:</p> <blockquote> <p>Class attributes are available both through direct reference to the class and through any instance of the class.</p> <p>Note: In Java, both static variables (called class attributes in Python) and instance variables (called data attributes in Python) are defined immediately after the class definition (one with the static keyword, one without). <strong>In Python, only class attributes can be defined here; data attributes are defined in the <code>__init__</code> method.</strong></p> </blockquote>
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    1. USBrendan Long
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    1. COThat did indeed do the trick. I had no idea you had to do things this way in Python. Thanks
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