Martin Panter added the comment:
I think this might just be a side effect of the way we abuse the tab completer
to insert a literal tab (Issue 23441, revision 82ccdf2df5ac). If I change the
code to insert the letter T instead of tabs:
if not text.strip('T'):
if state == 0:
return text + 'T'
else:
return None
I see this behaviour:
* Manually type three Ts
* Press Tab once, a fourth T is added nicely
* Press Tab a second time, it beeps and displays a completion list with a
single item, and then completes my line to five Ts
* Pressing Tab again repeats the beep, completion list, and appending a T
Illustration:
>>> TTTT <== Typed T three times, then Tab twice
TTTTT <== Completion list from second Tab press
>>> TTTTT
TTTTTT
>>> TTTTTT
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<http://bugs.python.org/issue25660>
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