[issue6623] Lib/ftplib.py netrc class parsing problem

[Vincent Legoll]

Vincent Legoll <vincent.legoll at gmail.com> added the comment:

If the macro_lines is not emptied upon end of parsing a macro
definition, if there's another macro definiton it will 'inherit' the
lines from the previous one, which could very well be uncool.

The use before definition should also be fixed.

Please advise if a better fix would be to completely remove the Netrc
class from ftplib, or replace it with a compatibility wrapper that use
the netrc module.

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<http://bugs.python.org/issue6623>
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