sets in python 3 code example

Example 1: python sets

# You can't create a set like this in Python
my_set = {} # ---- This is a Dictionary/Hashmap

# To create a empty set you have to use the built in method:
my_set = set() # Correct!


set_example = {1,3,2,5,3,6}
print(set_example)

# OUTPUT
# {1,3,2,5,6} ---- Sets do not contain duplicates and are unordered

Example 2: 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 3: python set

# A set contains unique elements of which the order is not important
s = set()
s.add(1)
s.add(2)
s.remove(1)
print(s)
# Can also be created from a list (or some other data structures)
num_list = [1,2,3]
set_from_list = set(num_list)

Example 4: 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'}

Example 5: get length of set python

# Create a set
seta = {5,10,3,15,2,20}
# Or
setb = set([5, 10, 3, 15, 2, 20])

# Find the length use len()
print(len(setb))

Example 6: python set

set_example = {1, 2, 3, 4, 5, 5, 5}

print(set_example)

# OUTPUT
# {1, 2, 3, 4, 5} ----- Does not print repetitions