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 unorderedsets 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'}set
SET: Can only store unique values,
And does not maintain order
- HashSet can have null, order is not guaranteed
- LinkedHashSet can have null and keeps the order
- TreeSet sorts the order and don't accept nullhow to define a set
emptySet = set()set
@echo off
set a[0]=1
set a[1]=2
set a[2]=3
Rem Setting the new value for the second element of the array
Set a[1]=5
echo The new value of the second element of the array is %a[1]%Set
Set<String> names = new HashSet<>();
names.add("John");
names.add("Jack");
names.add("John");
System.out.println(names); // [John, Jack]
names.remove("John");
boolean contains = names.contains("Jack"); // true
for (String name: names) {
System.out.println(name);
}Copyright © 2021 Codeinu
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