Python Sets - Day 10(day later)

*like dictioanry,but don't have keys

*immutable objects

*no order

*2 ways to create a set,one like the dictioanry,other by using the set keyword

  
farm_animals = {"cow","goat"}
print(farm_animals)
wild_animals= set(["Lion","Tiger"])
farm_animals.add("horse")
print(farm_animals)
wild_animals.add("horse")
print(wild_animals)

evennos = set(range(0,50,2))
print(evennos)

evennos = set(range(0,50,2))
print(evennos)
squares = {4,9,16,25,36}
print(squares)
print(sorted(squares))
print (squares.union(evennos))
#both will produce same result
print (evennos.union(squares))
#both will produce same result
print (squares.intersection(evennos))
print (evennos.intersection(squares))
print (evennos & squares)
print (squares & evennos )

#*empty set can not be created by using the curly braces {},since it will be treated as 
dictionary when calling the add method
emptyset1 = {}
print(emptyset1)
#the below code will throw error
# emptyset1.add("1")
print(emptyset1)
emptyset2 = set()
print(emptyset2)
#but not the below code
emptyset2.add("1")
print(emptyset2)

#differences/Minus
print(evennos)
print(squares)


print("squares minus evenos")
print(squares.difference((evennos)))
print(squares - evennos)

print("evenos minus squares ")
print(evennos.difference((squares)))
print(evennos - squares)

#update the difference in the set

squaretuple = (4,9,16,25,36)
squarenos = set(squaretuple)
evennos = set(range(0,50,2))
print(sorted(evennos))
print(sorted(squarenos))
print("="*40)
#will update the set after the difference
evennos.difference_update(squarenos)
print(evennos)


#symmetric difference,it is exact opposite of intersection

squarenos1 = {4,9,16,25,36}
evennos1 = set(range(0,50,2))
print(sorted(squarenos1))
print(sorted(evennos1))

print(evennos1.symmetric_difference(squarenos1))
#it will return the same result for both the line of the code
print(squarenos1.symmetric_difference(evennos1))

#discard & Remove,these two will affect the sets directly,
#disacard wont throw an error ,even if the value is not present there in the set,
#where as remove will throw if it does not exits

print(sorted(squarenos1))
print(sorted(evennos1))

squarenos1.discard(4)
squarenos1.remove(16)
print(sorted(squarenos1))
#wont throw error
squarenos1.discard(5)
#will throw error
# squarenos1.remove(5)

evensquarenos2 = {4,16,36}
evennos2 = set(range(0,50,2))
print(sorted(evensquarenos2))
print(sorted(evennos2))

if evennos2.issuperset(evensquarenos2):
    print("evennos is the superset of the evensquarenos")

if evensquarenos2.issubset(evennos2):
    print("evensquarenos is the subset of the evennos")


#frozenset,we can add,edit,remove the frozen set,but can do other operations 
#like union,intersection...
evenfrozen = frozenset({2,4,6})
print(evenfrozen)
#the below line will throw an error,since we are trying 
#to modify the frozen set which is not allowed
# evenfrozen.add(8)


#challenge ,remove the vowels from the string

stringval1= set("python is trending language")
stringval2= set("abcdefghijklmnopqrstuvwxyz")
frozensetstring = frozenset("aeiou")
print(stringval1.difference(frozensetstring))
print(sorted(stringval2.difference(frozensetstring)))