Terry J. Reedy added the comment:
Either leading sign, '+' or '-', cause string interpretation, so I think
'unsigned integer' should be the term in the doc.
>>> '{0[-1]}'.format({'-1': 'neg int key'})
'neg int key'
>>> '{0[+1]}'.format({'+1': 'neg int key'})
'neg int key'
>>> '{0[+1]}'.format([1,2,3])
Traceback (most recent call last):
File "<pyshell#16>", line 1, in <module>
'{0[+1]}'.format([1,2,3])
TypeError: list indices must be integers, not str
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