New submission from Pablo Galindo Salgado <pablog...@gmail.com>:

Given that is quite common to forgot a comma in containers, function calls, 
...etc and that the current error is:

>>> [a, b, c d]
  File "<stdin>", line 1
    [a, b, c d]
             ^
SyntaxError: invalid syntax

We could improve the user experience quite a lot if we mention that probably 
the user forgot a comma:

>>> [a, b, c d]
  File "<stdin>", line 1
    [a, b, c d]
             ^
SyntaxError: invalid syntax. Perhaps you forgot a comma?

----------
messages: 390916
nosy: pablogsal
priority: normal
severity: normal
status: open
title: Improve syntax errors for missing commas

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43822>
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