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Diffstat (limited to 'Doc/reference/expressions.rst')
| -rw-r--r-- | Doc/reference/expressions.rst | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst index 2a550b504ca..3d3bf1d9840 100644 --- a/Doc/reference/expressions.rst +++ b/Doc/reference/expressions.rst @@ -406,8 +406,9 @@ brackets or curly braces. Variables used in the generator expression are evaluated lazily when the :meth:`~generator.__next__` method is called for the generator object (in the same fashion as normal generators). However, the iterable expression in the -leftmost :keyword:`!for` clause is immediately evaluated, so that an error -produced by it will be emitted at the point where the generator expression +leftmost :keyword:`!for` clause is immediately evaluated, and the +:term:`iterator` is immediately created for that iterable, so that an error +produced while creating the iterator will be emitted at the point where the generator expression is defined, rather than at the point where the first value is retrieved. Subsequent :keyword:`!for` clauses and any filter condition in the leftmost :keyword:`!for` clause cannot be evaluated in the enclosing scope as they may |