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Rephrase dict.fromkeys() news.

This commit is contained in:
Guido van Rossum 2002-11-27 13:10:40 +00:00
parent caf17be1b7
commit c0d3f4e445
1 changed files with 5 additions and 4 deletions
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Misc/NEWS
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@ -270,10 +270,11 @@ Core and builtins
an optional argument that specifies the characters to strip. For an optional argument that specifies the characters to strip. For
example, "Foo!!!?!?!?".rstrip("?!") -> "Foo". example, "Foo!!!?!?!?".rstrip("?!") -> "Foo".
- Dictionaries have a new class method, fromkeys(iterable, value=None). - There's a new dictionary constructor (a class method of the dict
It constructs a new dictionary with keys taken from the iterable and class), dict.fromkeys(iterable, value=None). It constructs a
all values set to a single value. It is used for building membership dictionary with keys taken from the iterable and all values set to a
tests and for removing duplicates from sequences. single value. It can be used for building sets and for removing
duplicates from sequences.
- Added a new dict method pop(key). This removes and returns the - Added a new dict method pop(key). This removes and returns the
value corresponding to key. [SF patch #539949] value corresponding to key. [SF patch #539949]