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Diffstat (limited to 'Doc/howto/functional.rst')
| -rw-r--r-- | Doc/howto/functional.rst | 23 |
1 files changed, 12 insertions, 11 deletions
diff --git a/Doc/howto/functional.rst b/Doc/howto/functional.rst index 4060181..47a5bb9 100644 --- a/Doc/howto/functional.rst +++ b/Doc/howto/functional.rst @@ -273,23 +273,24 @@ dictionary's keys:: >>> m = {'Jan': 1, 'Feb': 2, 'Mar': 3, 'Apr': 4, 'May': 5, 'Jun': 6, ... 'Jul': 7, 'Aug': 8, 'Sep': 9, 'Oct': 10, 'Nov': 11, 'Dec': 12} - >>> for key in m: #doctest: +SKIP + >>> for key in m: ... print(key, m[key]) - Mar 3 + Jan 1 Feb 2 - Aug 8 - Sep 9 + Mar 3 Apr 4 + May 5 Jun 6 Jul 7 - Jan 1 - May 5 + Aug 8 + Sep 9 + Oct 10 Nov 11 Dec 12 - Oct 10 -Note that the order is essentially random, because it's based on the hash -ordering of the objects in the dictionary. +Note that starting with Python 3.7, dictionary iteration order is guaranteed +to be the same as the insertion order. In earlier versions, the behaviour was +unspecified and could vary between implementations. Applying :func:`iter` to a dictionary always loops over the keys, but dictionaries have methods that return other iterators. If you want to iterate @@ -301,8 +302,8 @@ The :func:`dict` constructor can accept an iterator that returns a finite stream of ``(key, value)`` tuples: >>> L = [('Italy', 'Rome'), ('France', 'Paris'), ('US', 'Washington DC')] - >>> dict(iter(L)) #doctest: +SKIP - {'Italy': 'Rome', 'US': 'Washington DC', 'France': 'Paris'} + >>> dict(iter(L)) + {'Italy': 'Rome', 'France': 'Paris', 'US': 'Washington DC'} Files also support iteration by calling the :meth:`~io.TextIOBase.readline` method until there are no more lines in the file. This means you can read each |