Raymond Hettinger added the comment:
Here is what other mutable types do:
>>> s = []
>>> s.__iadd__(1)
Traceback (most recent call last):
File "<pyshell#1>", line 1, in <module>
s.__iadd__(1)
TypeError: 'int' object is not iterable
>>> s = set()
>>> s.__ior__(1)
NotImplemented
>>> from collections import deque
>>> s = deque()
>>> s.__iadd__(1)
Traceback (most recent call last):
File "<pyshell#6>", line 1, in <module>
s.__iadd__(1)
TypeError: 'int' object is not iterable
>>> from array import array
>>> s = array('i')
>>> s.__iadd__(1)
Traceback (most recent call last):
File "<pyshell#10>", line 1, in <module>
s.__iadd__(1)
TypeError: can only extend array with array (not "int")
>>> s = bytearray()
>>> s.__iadd__(1)
Traceback (most recent call last):
File "<pyshell#12>", line 1, in <module>
s.__iadd__(1)
TypeError: can't concat int to bytearray
----------
priority: normal -> low
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue22766>
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