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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]