zip fixer fails on zip()[:-1]

[VPeric]

BPO	12616
Nosy	@benjaminp, @merwok, @asmeurer, @tirkarthi

^{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 2019-03-17.08:11:30.174>
created_at = <Date 2011-07-22.22:11:40.205>
labels = ['type-bug', 'expert-2to3']
title = 'zip fixer fails on zip()[:-1]'
updated_at = <Date 2019-03-17.08:11:30.171>
user = 'https://bugs.python.org/VPeric'

bugs.python.org fields:

activity = <Date 2019-03-17.08:11:30.171>
actor = 'xtreak'
assignee = 'none'
closed = True
closed_date = <Date 2019-03-17.08:11:30.174>
closer = 'xtreak'
components = ['2to3 (2.x to 3.x conversion tool)']
creation = <Date 2011-07-22.22:11:40.205>
creator = 'VPeric'
dependencies = []
files = []
hgrepos = []
issue_num = 12616
keywords = []
message_count = 3.0
messages = ['140919', '221464', '338119']
nosy_count = 5.0
nosy_names = ['benjamin.peterson', 'eric.araujo', 'VPeric', 'Aaron.Meurer', 'xtreak']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue12616'
versions = ['Python 2.7', 'Python 3.4', 'Python 3.5']

[VPeric]

The zip fixer fails on this code:

zip(B, D)[:-1]

I fixed this by wrapping explicitly with list(), but that creates a duplicate list on Python 2.

(Like the other fixes I reported, I assume this also applies to 3.3, but I didn't test it so I don't know; adding Eric and Benjamin to nosy, though)

[BreamoreBoy]

@benjamin can you take this on please?

[tirkarthi]

This seems to have been fixed with bpo-28837 and 93b4b47. Marking this as resolved. Thanks for the report.

➜  cpython git:(master) ✗ cat /tmp/foo.py
zip(B, D)[:-1]
➜  cpython git:(master) ✗ 2to3-3.7 /tmp/foo.py
RefactoringTool: Skipping optional fixer: buffer
RefactoringTool: Skipping optional fixer: idioms
RefactoringTool: Skipping optional fixer: set_literal
RefactoringTool: Skipping optional fixer: ws_comma
RefactoringTool: Refactored /tmp/foo.py
--- /tmp/foo.py	(original)
+++ /tmp/foo.py	(refactored)
@@ -1 +1 @@
-zip(B, D)[:-1]
+list(zip(B, D))[:-1]
RefactoringTool: Files that need to be modified:
RefactoringTool: /tmp/foo.py