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Showing content from https://mail.python.org/pipermail/python-dev/2002-July/026776.html below:

[Python-Dev] Single- vs. Multi-pass iterability

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aahz wrote:

> > I believe this is where the biggest debate lies: whether "for" =
should be
> > non-destructive.  I realize we are currently on the other side of =
the
> > fence, but i foresee enough potential pain that i would like you to
> > consider the value of keeping "for" loops non-destructive.
>
> Consider
>=20
>     for line in f.readlines():
>=20
> in any version of Python.

and?  for-in doesn't modify the object returned
by f.readlines(), and never has.

</F>

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