[issue35133] Bugs in concatenating string literals on different lines

[Serhiy Storchaka]

New submission from Serhiy Storchaka <storchaka+cpython at gmail.com>:

The following PR fixes many bugs related to concatenating string literals on different lines. There are two kinds of errors:

1. Missed space. The first line is ended with a word, and the second line is started with a word. When they are concatenated, there is no space between words. This is the same issue as issue35128, but not only in warning messages, and not only in Python.

2. Missed comma in a list of string literals. This leads to concatenating the last string in the first line and the first list in the second line.

----------
components: Library (Lib)
messages: 329059
nosy: serhiy.storchaka
priority: normal
severity: normal
status: open
title: Bugs in concatenating string literals on different lines
type: behavior
versions: Python 3.6, Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35133>
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