[issue4791] retrlines('LIST') and dir hang at end of listing in ftplib (python3.0)

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> Can you put some print diagnostics inside Lib/ftplib.py (...)

<your ftp object>.set_debuglevel(2) already prints a lot of 
informations.

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<http://bugs.python.org/issue4791>
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