[New-bugs-announce] [issue17434] str literals, which are not docstrings, should not be allowed between __future__ imports

[Arfrever Frehtes Taifersar Arahesis]

New submission from Arfrever Frehtes Taifersar Arahesis:

test1.py shows that a str literal before first import from __future__ is a docstring.
test2.py shows that a str literal after first import from __future__ is not a docstring.
test2.py shows that if docstring is absent, then a single str literal between imports from __future__ does not cause SyntaxError, while it should.
test3.py shows that if docstring is present, then a str literal between imports from __future__ causes SyntaxError.
test4.py shows that if docstring is absent, then >=2 str literals between imports from __future__ cause SyntaxError.

$ cat test1.py
"some text"
from __future__ import absolute_import
print(__doc__)
$ cat test2.py
from __future__ import absolute_import
"some text"
from __future__ import print_function
print(__doc__)
$ cat test3.py
"some text 1"
from __future__ import absolute_import
"some text 2"
from __future__ import print_function
$ cat test4.py
from __future__ import absolute_import
"some text 1"
"some text 2"
from __future__ import print_function
$ python3.4 test1.py
some text
$ python3.4 test2.py
None
$ python3.4 test3.py
  File "test3.py", line 4
    from __future__ import print_function
    ^
SyntaxError: from __future__ imports must occur at the beginning of the file
$ python3.4 test4.py
  File "test4.py", line 4
    from __future__ import print_function
    ^
SyntaxError: from __future__ imports must occur at the beginning of the file
$

----------
components: Interpreter Core
messages: 184277
nosy: Arfrever
priority: normal
severity: normal
status: open
title: str literals, which are not docstrings, should not be allowed between __future__ imports
versions: Python 2.7, Python 3.2, Python 3.3, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17434>
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