turtledemo/__main__.py: SyntaxError: invalid string prefix else"#fca"

[hroncok]

BPO	40431
Nosy	@terryjreedy, @vstinner, @encukou, @hroncok, @miss-islington, @aeros
PRs	bpo-40431: Fix syntax typo in turtledemo #19777 [3.8] bpo-40431: Fix syntax typo in turtledemo (GH-19777) #19784 [3.7] [3.8] bpo-40431: Fix syntax typo in turtledemo (GH-19777) (GH-19784) #19789

^{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 2020-04-29.03:15:51.848>
created_at = <Date 2020-04-28.23:29:18.609>
labels = ['3.8', '3.9']
title = 'turtledemo/__main__.py: SyntaxError: invalid string prefix else"#fca"'
updated_at = <Date 2020-05-17.22:38:35.100>
user = 'https://github.com/hroncok'

bugs.python.org fields:

activity = <Date 2020-05-17.22:38:35.100>
actor = 'terry.reedy'
assignee = 'none'
closed = True
closed_date = <Date 2020-04-29.03:15:51.848>
closer = 'aeros'
components = ['Demos and Tools']
creation = <Date 2020-04-28.23:29:18.609>
creator = 'hroncok'
dependencies = []
files = []
hgrepos = []
issue_num = 40431
keywords = ['patch']
message_count = 12.0
messages = ['367575', '367581', '367583', '367585', '367590', '367607', '367609', '367612', '367618', '367638', '367648', '369154']
nosy_count = 6.0
nosy_names = ['terry.reedy', 'vstinner', 'petr.viktorin', 'hroncok', 'miss-islington', 'aeros']
pr_nums = ['19777', '19784', '19789']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue40431'
versions = ['Python 3.8', 'Python 3.9']

[hroncok]

With Python 3.9.0a6 we get the following syntax error when bytecompiling the standard library in Fedora:

Compiling '/usr/lib64/python3.9/turtledemo/main.py'...
*** File "/usr/lib64/python3.9/turtledemo/main.py", line 275
bg="#d00" if clear == NORMAL else"#fca")
^
SyntaxError: invalid string prefix

I've looked and the bad code is there for all branches, but only with 3.9.0a6 I get the SyntaxError.

I wonder whether this is a know new SyntaxError or not. This "worked" with 3.9.0a5:

>>> "yes" if False else"no"
'no'

Happy to submit a PR for turtledemo.

[vstinner]

New changeset 49f70db by Miro Hrončok in branch 'master':
bpo-40431: Fix syntax typo in turtledemo (GH-19777)
49f70db

[vstinner]

I don't think that it's worth it to backport the change to 3.7 and 3.8: in Python 3.7 and 3.8, the code is accepted.

I also reported the issue to: https://bugs.python.org/issue40334#msg367580

Miro: are you ok to close the issue (not backport)?

[hroncok]

I am OK. I don't see why not to backport it, but I don't care much.

[vstinner]

I am OK. I don't see why not to backport it, but I don't care much.

Python 3.7 and 3.8 are not broken, so there is no need to fix them :-) Thanks for the fix.

I reported the issue to:
https://bugs.python.org/issue40246#msg367587