Python Language Set: Difference between revisions
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Line 39: | Line 39: | ||
s.remove('a') | s.remove('a') | ||
</syntaxhighlight> | </syntaxhighlight> | ||
Does not return anything. | Does not return anything, simply removes the element. | ||
If the element does not exist, throws <code>KeyError: 'a'</code>. | |||
=Convert to List= | =Convert to List= | ||
<syntaxhighlight lang='py'> | <syntaxhighlight lang='py'> |
Revision as of 04:40, 4 February 2023
Internal
TODO
- TO PROCESS PyOOP "Sets"
Overview
Sets and the __hash__() Function
Initialization
Literal initialization:
s = {1, 2, 3}
Set from a tuple:
s = set((1, 2, 3))
Set from a list:
s = set([1, 2, 3])
Set from a string:
s = set('ABC')
print(s) # {'C', 'B', 'A'}
Shallow Copy
s = set()
s.add('a')
s2 = s.copy()
Remove an Element from a Set
s.remove('a')
Does not return anything, simply removes the element.
If the element does not exist, throws KeyError: 'a'
.
Convert to List
s=set()
l=list(s)
frozenset()
The fronzenset()
returns an immutable frozenset object initialized with the elements from a given iterable. frozenset objects can be used as dictionary keys.
If the iterable contains duplicate elements, they are ignored (the iterable is handled like a set):
f = frozenset(['a', 'b', 'c'])
f2 = frozenset(['a', 'b', 'c', 'a'])
assert f == f2