[issue21261] Teach IDLE to Autocomplete dictionary keys

[Louie Lu]

Louie Lu added the comment:

In this PR, it will complete dictionary key with string, int, and others.

for example:

    d = {'long_key': 10, 'short_key': 20, 30: 40, (((1, 2), 3, 4), 5): 50}
    d['lo<tab>  -> d['long_key'
    d[(((1<tab> -> d[(((1, 2), 3, 4), 5)
    d[3<tab>    -> d[30

The problem is, autocomplete_w can't figure the original key is string or others, so this will be possible:

    d[long<tab> -> d[long_key]
    d[shor<tab> -> d[short_key]

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nosy: +louielu

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21261>
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