PEP new assert idiom

[Fábio Mendes]

[...]
> 
> Nope, comma can never be used as implicit line continuation in Python
> (that's different from some other languages).  The opened and yet
> unclosed parentheses are what cause several physical lines to be part of
> the same logical line -- not commas, nor other operator or punctuation.
> 
[...]
> You may be associating "commas continue lines" with "function arguments"
> because function definitions and calls DO use parentheses, and separate
> arguments with commas.  But it's really not an ideal mental model.

You're right, that's a subtle misconception that don't give syntax
errors so I never realize to be the case ;-) I was writing multiple line
dictionaries like this:

>>> dic = { \
...     key: value
...     key2: value2 }

The backslash is completely uncecessary (and ugly!). Thanks for
clarification,

-Fabio