local var in "for v in iter" modify the uplevel var value.

[zaazbb]

BPO	28034
Nosy	@bitdancer, @zaazbb

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2016-09-09.02:20:14.626>
created_at = <Date 2016-09-09.02:15:37.529>
labels = ['interpreter-core', 'type-bug', 'invalid']
title = 'local var in "for v in iter" modify the uplevel var value.'
updated_at = <Date 2016-09-09.02:20:14.616>
user = 'https://github.com/zaazbb'

bugs.python.org fields:

activity = <Date 2016-09-09.02:20:14.616>
actor = 'r.david.murray'
assignee = 'none'
closed = True
closed_date = <Date 2016-09-09.02:20:14.626>
closer = 'r.david.murray'
components = ['Interpreter Core']
creation = <Date 2016-09-09.02:15:37.529>
creator = 'zaazbb'
dependencies = []
files = []
hgrepos = []
issue_num = 28034
keywords = []
message_count = 2.0
messages = ['275233', '275234']
nosy_count = 2.0
nosy_names = ['r.david.murray', 'zaazbb']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue28034'
versions = ['Python 3.5']

[zaazbb]

eg:

s = 'aaa'
print(s)
for s in '111', '222', '333':
    print(s)
print(s)

the right result should be:
'aaa'
'111'
'222'
'333'
'aaa'

but, i got:
'aaa'
'111'
'222'
'333'
'333'

the local var in "for v in iter", modify the uplevel var value.
Is it wrong?

[bitdancer]

No, that's the way python works. A for loop does not have its own scope.