Serhiy Storchaka added the comment:
Here is reproducer without IDLE. Looks as pickle is a culprit.
>>> import pickle
>>> s = ''
>>> for i in range(5):
... s += chr(0xe0)
... print(len(s), s, s.encode(), repr(s))
... print(' ', pickle.dumps(s))
...
1 à b'\xc3\xa0' 'à'
b'\x80\x03X\x02\x00\x00\x00\xc3\xa0q\x00.'
2 àà b'\xc3\xa0\xc3\xa0' 'àà'
b'\x80\x03X\x04\x00\x00\x00\xc3\xa0\xc3\xa0q\x00.'
3 àà b'\xc3\xa0\xc3\xa0' 'ààà'
b'\x80\x03X\x04\x00\x00\x00\xc3\xa0\xc3\xa0q\x00.'
4 àà b'\xc3\xa0\xc3\xa0' 'àààà'
b'\x80\x03X\x04\x00\x00\x00\xc3\xa0\xc3\xa0q\x00.'
5 àà b'\xc3\xa0\xc3\xa0' 'ààààà'
b'\x80\x03X\x04\x00\x00\x00\xc3\xa0\xc3\xa0q\x00.'
----------
priority: normal -> high
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue25709>
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