Sets are collection of immutable elements with NO duplicate values.
A Set CANNOT contain mutable elements like list, dictionary, and sets.
A Set CAN contain immutable elements like, numbers, strings, and tuples.
Sets are commonly used to remove duplicate values from a collection of values in a list or tuple.
You can create a set by using the curly braces { } and putting elements separated by commas.
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#### Creating Sets #### # Defining sets set1={2,2,3,1,1,4,4} set2={5,5,3,4,5,5} set3={'a','c','c','b','b'} print(type(set1)) # printing the sets print(set1) print(set2) print(set3) |
Sample Output
Sets does not support indexing
Sets cannot be iterated because they does not support indexing.
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#### Sets does not support indexing # Defining a set set1={2,3,4,5} # sets does not support indexing # Below command will throw error! set1[2] |
Sample Output
Using set to Remove duplicate values
Python sets are frequently used to remove duplicate values from a list or tuple.
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# Removing duplicate values # Defining a sample list and tuple sampleList=[2,3,4,4,4,5,5,5,8,2,'b','b'] sampleTuple=(2,3,'a','a',4,4,10) # Removing duplicates using set print(set(sampleList)) print(set(sampleTuple)) |
Sample Output
Common set commands
Sets are used primarily to get comparison between two set of values. Sets are built for the operations like intersection, union etc.
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#### Common Set commands #### # Defining sets set1={2,2,3,1,1,4,4} set2={5,5,3,4,5} print('set1:',set1) print('set2:',set2) # set OR operation print('OR Operation:', set1 | set2) # set AND operation print('AND Operation:', set1 & set2) # What elements are present in set1 which are not in set2 print('uncommon elements:', set1 - set2) # What elements are present in set2 which are not in set1 print('uncommon elements:',set2 - set1) # adding a SINGLE new item to set set1.add(10) print('After adding new element:',set1) # adding a MULTIPLE new items to set set1.update([20,30,40]) print('After adding multiple new elements:',set1) # removing an element from the set set1.remove(30) print('After removing SINGLE element:',set1) # removing MULTIPLE elements from the set set1.difference_update({20,30}) print('After removing MULTIPLE elements:',set1) # clear() function will remove all elements print(set1.clear()) print(set1) |
Sample Output
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