New submission from Guy Galun <galun....@gmail.com>:
When encountering an import that should be removed in Python 3 (e.g. "from
itertools import izip"), 2to3 changes it a blank line, which may cause a
runtime error if that import was indented:
error: module importing failed: expected an indented block (ptypes.py, line 10)
File "temp.py", line 1, in <module>
File "./lldbmacros/xnu.py", line 771, in <module>
from memory import *
File "./lldbmacros/memory.py", line 11, in <module>
import macho
File "./lldbmacros/macho.py", line 3, in <module>
from macholib import MachO as macho
File "./lldbmacros/macholib/MachO.py", line 10, in <module>
from .mach_o import MH_FILETYPE_SHORTNAMES, LC_DYSYMTAB, LC_SYMTAB
File "./lldbmacros/macholib/mach_o.py", line 16, in <module>
from macholib.ptypes import p_uint32, p_uint64, Structure, p_long,
pypackable
Relevant section before 2to3:
try:
from itertools import izip, imap
except ImportError:
izip, imap = zip, map
from itertools import chain, starmap
And after 2to3:
try:
except ImportError:
izip, imap = zip, map
from itertools import chain, starmap
* Side note:
This specific case may only be problematic with scripts that are partially
aware of Python 3, otherwise they wouldn't try-catch that import.
* Proposed solution:
In case of that kind of import being the single line of an indented block,
change it to "pass" instead of a blank line.
----------
components: 2to3 (2.x to 3.x conversion tool)
files: ptypes.py
messages: 359978
nosy: galun.guy
priority: normal
severity: normal
status: open
title: 2to3 mishandles indented imports
type: crash
versions: Python 3.9
Added file: https://bugs.python.org/file48839/ptypes.py
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39331>
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