Arthur Milchior <art...@milchior.fr> added the comment:

https://docs.python.org/3/reference/expressions.html#grammar-token-python-grammar-expression
 is wrong
This line state:
`expression             ::=  conditional_expression | lambda_expr`
and it is a problem because, by the way sphinx understand reference, this mean 
that any people who use the token `expression` will be linked to this 
particular line.
For example in 
https://docs.python.org/3/reference/expressions.html#grammar-token-python-grammar-key_datum
`key_datum          ::=  expression ":" expression | "**" or_expr`
while clearly a key_datum is not expecting only a conditional expression or a 
lambda expression.

Admittedly, you can derive, from  expression:
* conditional_expression
* or_test
* and_test
* not_test
* comparison
* or_expr
* xor_expr
* and_expr
* shift_expr
* a_expr
* m_expr
* u_expr
* power
* primary
* atom

in this order, so in practice you can probably derive most of the expressions. 
However, I doubt that this is what the documentation meant here, and clearly 
not practical.

----------
title: The documentation wrongly uses or_expr for star expresion in displays -> 
"expression" is erroneous in the doc

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue45646>
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