sets in python 2.7 code example

Example 1: sets in python

The simplest way to create set is:
1. from list
code:
	s = [1,2,3]
	set = set(s)
	print(set)

2. s,add() method
code:
	set.add(1)
	set.add(2)
	set.remove(2)
	print(set)  // 1

3. Set conatins unique elements

Example 2: sets in python

basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}
print(basket)                      # show that duplicates have been removed
# OUTPUT {'orange', 'banana', 'pear', 'apple'}
print('orange' in basket)                 # fast membership testing
# OUTPUT True
print('crabgrass' in basket)
# OUTPUT False

# Demonstrate set operations on unique letters from two words

print(a = set('abracadabra'))
print(b = set('alacazam'))
print(a)                                  # unique letters in a
# OUTPUT {'a', 'r', 'b', 'c', 'd'}
print(a - b)                             # letters in a but not in b
# OUTPUT {'r', 'd', 'b'}
print(a | b)                              # letters in a or b or both
# OUTPUT {'a', 'c', 'r', 'd', 'b', 'm', 'z', 'l'}
print(a & b)                              # letters in both a and b
# OUTPUT {'a', 'c'}
print(a ^ b)                              # letters in a or b but not both
# OUTPUT {'r', 'd', 'b', 'm', 'z', 'l'}