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Replace Ping's value judgement by a more neutral explanation of why 

iterators need to support __iter__.
This commit is contained in:
Guido van Rossum 2002-07-19 04:25:06 +00:00
parent 9aee42f23e
commit a2d549a704
1 changed files with 2 additions and 6 deletions
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pep-0234.txt
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@ -163,12 +163,8 @@ Python API Specification
Container-like objects usually support protocol 1. Iterators are
currently required to support both protocols. The semantics of
iteration come only from protocol 2; protocol 1 is present to make
iterators behave like sequences. But the analogy is weak -- unlike
ordinary sequences, iterators are "sequences" that are destroyed
by the act of looking at their elements.
Consequently, whenever any Python programmer says "for x in y",
he or she must be sure of whether this is going to destroy y.
iterators behave like sequences; in particular so that code
receiving an iterator can use a for-loop over the iterator.
Dictionary Iterators