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[python3/en] Add note about dictionary item ordering in Python 3.7+ (#3423)

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* Add changes to dict item ordering in Python 3.7+
* Fix line length
* Fix typo in example
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Nico Dinata 2018-12-21 05:42:35 +11:00 committed by Divay Prakash
parent d5b09d5b13
commit 62926bd431
1 changed files with 8 additions and 5 deletions
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@ -314,16 +314,19 @@ valid_dict = {(1,2,3):[1,2,3]} # Values can be of any type, however.
filled_dict["one"] # => 1
# Get all keys as an iterable with "keys()". We need to wrap the call in list()
# to turn it into a list. We'll talk about those later. Note - Dictionary key
# ordering is not guaranteed. Your results might not match this exactly.
list(filled_dict.keys()) # => ["three", "two", "one"]
# to turn it into a list. We'll talk about those later. Note - for Python
# versions <3.7, dictionary key ordering is not guaranteed. Your results might
# not match the example below exactly. However, as of Python 3.7, dictionary
# items maintain the order at which they are inserted into the dictionary.
list(filled_dict.keys()) # => ["three", "two", "one"] in Python <3.7
list(filled_dict.keys()) # => ["one", "two", "three"] in Python 3.7+
# Get all values as an iterable with "values()". Once again we need to wrap it
# in list() to get it out of the iterable. Note - Same as above regarding key
# ordering.
list(filled_dict.values()) # => [3, 2, 1]
list(filled_dict.values()) # => [3, 2, 1] in Python <3.7
list(filled_dict.values()) # => [1, 2, 3] in Python 3.7+
# Check for existence of keys in a dictionary with "in"
"one" in filled_dict # => True