29.Sets

#A set is a collection of unordered and unique values. It has no specific order. 
#One can't change the items of a set, but you can add to the set and remove from it.

s = {2.8, 67, 1, 8.0098}

print(type(s))
#Output: <class 'set'>

#length of a set
print(len(s))
#Output: 4

#Adding a single item
s.add(11.23)        
print(s)
#Output: {1, 2.8, 67, 8.0098, 11.23}

#Adding multiple items
s.update([23, 56])
print(s)
#Output: {1, 2.8, 67, 8.0098, 11.23, 23, 56}

#Checking membership
print(11.23 in s)
#Output: True

#Copying a set
d = s.copy()
print(d)
#Output: {1, 2.8, 67, 23, 8.0098, 56, 11.23}

#Removing an item
d.remove(11.23)
print(d)
#Output: {1, 2.8, 67, 23, 8.0098, 56}
'''
Since set has no definite order, items may not be in same order as the orginal set.
'''