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Very subtle syntax change: in a list comprehension, the testlist in

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"for <var> in <testlist> may no longer be a single test followed by
a comma.  This solves SF bug #431886.  Note that if the testlist
contains more than one test, a trailing comma is still allowed, for
maximum backward compatibility; but this example is not:

    [(x, y) for x in range(10), for y in range(10)]
                              ^

The fix involved creating a new nonterminal 'testlist_safe' whose
definition doesn't allow the trailing comma if there's only one test:

    testlist_safe: test [(',' test)+ [',']]
This commit is contained in:
Guido van Rossum 2001-10-15 15:44:05 +00:00
parent 69c0ff3836
commit 1c917072ca
5 changed files with 180 additions and 141 deletions
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15
Include/graminit.h
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@ -56,10 +56,11 @@
#define sliceop 311
#define exprlist 312
#define testlist 313
#define dictmaker 314
#define classdef 315
#define arglist 316
#define argument 317
#define list_iter 318
#define list_for 319
#define list_if 320
#define testlist_safe 314
#define dictmaker 315
#define classdef 316
#define arglist 317
#define argument 318
#define list_iter 319
#define list_for 320
#define list_if 321