How to create a set in Python
What is a set
A set is an unordered collection with no duplicate elements.
We can create a set from a range.
print set(range(10))
The code above generates the following result.
Or we can create a set from a list.
print set([0, 1, 2, 3, 0, 1, 2, 3, 4, 5])
The code above generates the following result.
Sets are constructed from a sequence or some other iterable object. Their main use lies in checking membership, and thus duplicates are ignored.
Set operations
a = set('abracadabra')
b = set('alacazam')
print a # unique letters in a
set(['a', 'r', 'b', 'c', 'd'])
print a - b # letters in a but not in b
# from w w w. j a v a 2 s . c o m
print a | b # letters in either a or b
print a & b # letters in both a and b
print a ^ b # letters in a or b but not both
The code above generates the following result.
