New submission from py.user <port...@yandex.ru>:
1)
4.6.4 Mutable Sequence Types
| s[i:j] = t | slice of s from i to j is replaced |
| | by the contents of the iterable t |
>>> lst = list('abc')
>>> barr = bytearray(b'abc')
>>> lst[:1] = 4
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: can only assign an iterable
>>> barr[:1] = 4
>>> barr
bytearray(b'\x00\x00\x00\x00bc')
>>>
there is no info about this feature in the documentation
2)
4.6.4 Mutable Sequence Types
| s.extend(x) | same as s[len(s):len(s)] = x |
>>> lst = list('abc')
>>> barr = bytearray(b'abc')
>>> lst.extend(4)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'int' object is not iterable
>>> barr.extend(4)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'int' object is not iterable
>>> lst[len(lst):len(lst)] = 4
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: can only assign an iterable
>>> barr[len(barr):len(barr)] = 4
>>> barr
bytearray(b'abc\x00\x00\x00\x00')
>>>
barr.extend(x) != barr[len(barr):len(barr)] = x
----------
assignee: docs@python
components: Documentation, Interpreter Core
messages: 140924
nosy: docs@python, py.user
priority: normal
severity: normal
status: open
title: Mutable Sequence Type can work not only with iterable in slice[i:j] = t
type: behavior
versions: Python 3.1
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue12617>
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