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For a couple of sequences (bytes, list, tuple, bytearray), the error when using an invalid sequence index is misleading, because it says that only integers are allowed, while slices are allowed too.
>>> a = []
>>> a['python']
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: list indices must be integers, not str
>>>
For instance, here's how range does it:
>>> range(1)['a']
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: range indices must be integers or slices, not str
The attached patch improves these error messages.

New changeset 02d6d3a7a181 by Terry Jan Reedy in branch 'default':
Issue #22077: Improve index error messages for bytearrays, bytes, lists, and
http://hg.python.org/cpython/rev/02d6d3a7a181 

while at it, I changed bytearray messages to include bad type as other do.