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PEP 308 implementation, including minor refdocs and some testcases. It

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breaks the parser module, because it adds the if/else construct as well as
two new grammar rules for backward compatibility. If no one else fixes
parsermodule, I guess I'll go ahead and fix it later this week.

The TeX code was checked with texcheck.py, but not rendered. There is
actually a slight incompatibility:

>>> (x for x in lambda:0)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: iteration over non-sequence

changes into

>>> (x for x in lambda: 0)
  File "<stdin>", line 1
    (x for x in lambda: 0)
                     ^
SyntaxError: invalid syntax

Since there's no way the former version can be useful, it's probably a
bugfix ;)
This commit is contained in:
Thomas Wouters 2006-02-27 00:24:13 +00:00
parent d3a5f53a27
commit dca3b9c797
11 changed files with 878 additions and 642 deletions
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11
Doc/ref/ref5.tex
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@ -155,8 +155,7 @@ square brackets:
\begin{productionlist}
\production{test}
{\token{and_test} ( "or" \token{and_test} )*
| \token{lambda_form}}
{\token{or_test} | \token{lambda_form}}
\production{testlist}
{\token{test} ( "," \token{test} )* [ "," ]}
\production{list_display}
@ -1017,7 +1016,8 @@ Boolean operations have the lowest priority of all Python operations:
\begin{productionlist}
\production{expression}
{\token{or_test} | \token{lambda_form}}
{\token{or_test} [\token{if} \token{or_test} \token{else}
\token{test}] | \token{lambda_form}}
\production{or_test}
{\token{and_test} | \token{or_test} "or" \token{and_test}}
\production{and_test}
@ -1036,6 +1036,11 @@ The operator \keyword{not} yields \code{True} if its argument is false,
\code{False} otherwise.
\opindex{not}
The expression \code{\var{x} if \var{C} else \var{y}} first evaluates
\var{C} (\emph{not} \var{x}); if \var{C} is true, \var{x} is evaluated and
its value is returned; otherwise, \var{y} is evaluated and its value is
returned.
The expression \code{\var{x} and \var{y}} first evaluates \var{x}; if
\var{x} is false, its value is returned; otherwise, \var{y} is
evaluated and the resulting value is returned.