<\/span><\/h2>\n\n\n\nThe set() constructor converts a list into a set of unique items. Thereafter, you can apply various functions available to the sets to compare lists. These functions are similar to mathematical operations applied to sets. Here is an example to check if two lists have any common elements.<\/p>\n\n\n\n
a=[1, 2, 3, 4]
b=[4, 5, 6, 7]
print(set(a)&set(b)) # output is {4}
print(set(a).intersection(b)) # output is {4}<\/pre>\n\n\n\nIf you want the result to be a list, then you can wrap the result of above code in list() constructor.<\/p>\n\n\n\n
print(list(set(a) & set(b))) # output is [4]<\/pre>\n\n\n\nHere is the command to find the union of two lists. This will return the set of union of all elements.<\/p>\n\n\n\n
print(set(a).union(b)) # output is {1, 2, 3, 4, 5, 6, 7}<\/pre>\n\n\n\nSimilarly, if you want to find the elements that are present in one list but not the other then you can use ‘-‘ operator to get the difference.<\/p>\n\n\n\n
print(set(a)-set(b)) # output is {1, 2, 3}
print(set(b)-set(a)) # output is {5, 6, 7}<\/pre>\n\n\n\n