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Fri Jan 20 20:51:39 CET 2006 · https://mail.python.org/pipermail/python-dev/2006-January/059961.html

Guido van Rossum <guido at python.org> wrote:

The discussion about PEP 343 reminds me of the following. Bram Cohen
pointed out in private email that, before PEP 342, there wasn't a big
need for a shortcut to pass control to a "sub-generator" because the
following for-loop works well enough:

 def main_generator():
      ...
      for value in sub_generator():
          yield value

This is an important programming trick. It allows recursive use of 
generators for walking trees, etc. See the source code for os.walk for 
an example.

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[Python-Dev] yield back-and-forth?