Re: Help me understand this iterator

LaundroMat wrote:

Now, if I look at this script step by step, I don't understand:
- what is being iterated over (what is being called by "file in
DirectoryWalker()"?);

as explained in the text above the script, this class emulates a sequence. it does this by implementing the __getindex__ method:

http://effbot.org/pyref/__getitem__

- where it gets the "index" value from;

from the call to __getitem__ done by the for-in loop.

- where the "while 1:"-loop is quitted.

the loop stops when the stack is empty, and pop raises an IndexError exception.

note that this is an old example; code written for newer versions of Python would probably use a recursing generator instead (see the source code for os.walk in the standard library for an example).

</F>

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