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Id
5122620
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0
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0
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0
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CreationDate
2011-02-25T21:03:53.137
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0
LastActivityDate
2011-02-25T21:09:32.873
LastEditDate
2011-02-25T21:09:32.873
LastEditorUserId
135978
OwnerUserId
135978
ParentId
5122593
PostTypeId
2
Score
3
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0
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text
Body
In Python, any class instance's method has <a href="http://docs.python.org/tutorial/classes.html#random-remarks" rel="nofollow"><code>self</code></a> passed in by the Python interpreter and all of the other arguments are shifted down one place automatically. In other words the Python interpreter rewrites: <pre><code>urlaccess.retrieve(url, saveas) </code></pre> into something that looks like this: <pre><code>urlaccess.retrieve(urlaccess, url, saveas) </code></pre> So you don't have to do it yourself. However, since <blockquote> explicit is better than implicit </blockquote> any instance methods you declare for a Python object must specify explicitly that they take the instance of the object as their first argument even though Python will pass that argument without any action on the part of the programmer. The first argument does not have to be called <code>self</code> ... that is only a convention. <hr> So, to actually answer your question though (as mluebke did) -- you need to specify the <code>self</code> argument. <pre><code>def http_error_404(url, fp, errcode, errmsg, headers, data): url.file_was_found = False # Python is treating `url` as `self` # Therefore the URL is being saved in `fp`, `fp` in `errcode`, etc. </code></pre> To fix this problem add a first argument to pick up the instance. <pre><code>def http_error_404(self, url, fp, errcode, errmsg, headers, data): self.file_was_found = False # Now everything should work </code></pre>
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1. POWhat happens to the variable in this case when it is overwritten with self?
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1. USSean Vieira
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1. USSean Vieira
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