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      Add Set Items

      Python Tutorial

      This Python tutorial has been written for the beginners to help them understand the basic to advanced concepts of Python Programming Language. After completing this tutorial, you will find yourself at a great level of expertise in Python, from where you can take yourself to the next levels to become a world class Software Engineer.

      Add Set Items

      Even if a set holds together only immutable objects, set itself is mutable. We can add new items in it with any of the following ways

      add() Method

      The add() method in set class adds a new element. If the element is already present in the set, there is no change in the set.

      Syntax

      set.add(obj)

      Parameters

      • obj − an object of any immutable type.

      Example

      Take a look at the following example
      lang1 = {"C", "C++", "Java", "Python"}
      lang1.add("Golang")
      print (lang1)
      It will produce the following output
      {'Python', 'C', 'Golang', 'C++', 'Java'}

      update() Method

      The update() method of set class includes the items of the set given as argument. If elements in the other set has one or more items that are already existing, they will not be included.

      Syntax

      set.update(obj)

      Parameters

      • obj − a set or a sequence object (list, tuple, string)

      Example

      The following example shows how the update() method works
      lang1 = {"C", "C++", "Java", "Python"}
      lang2 = {"PHP", "C#", "Perl"}
      lang1.update(lang2)
      print (lang1)
      It will produce the following output
      {'Python', 'Java', 'C', 'C#', 'PHP', 'Perl', 'C++'}

      Example

      The update() method also accepts any sequence object as argument. Here, a tuple is the argument for update() method.
      lang1 = {"C", "C++", "Java", "Python"}
      lang2 = ("PHP", "C#", "Perl")
      lang1.update(lang2)
      print (lang1)
      It will produce the following output
      {'Java', 'Perl', 'Python', 'C++', 'C#', 'C', 'PHP'}

      Example

      In this example, a set is constructed from a string, and another string is used as argument for update() method.
      set1 = set("Hello")
      set1.update("World")
      print (set1)
      It will produce the following output
      {'H', 'r', 'o', 'd', 'W', 'l', 'e'}

      union() Method

      The union() method of set class also combines the unique items from two sets, but it returns a new set object.

      Syntax

      set.union(obj)

      Parameters

      • obj − a set or a sequence object (list, tuple, string)

      Return value

      The union() method returns a set object

      Example

      The following example shows how the union() method works
      lang1 = {"C", "C++", "Java", "Python"}
      lang2 = {"PHP", "C#", "Perl"}
      lang3 = lang1.union(lang2)
      print (lang3)
      It will produce the following output
      {'C#', 'Java', 'Perl', 'C++', 'PHP', 'Python', 'C'}

      Example

      If a sequence object is given as argument to union() method, Python automatically converts it to a set first and then performs union.
      lang1 = {"C", "C++", "Java", "Python"}
      lang2 = ["PHP", "C#", "Perl"]
      lang3 = lang1.union(lang2)
      print (lang3)
      It will produce the following output
      {'PHP', 'C#', 'Python', 'C', 'Java', 'C++', 'Perl'}

      Example

      In this example, a set is constructed from a string, and another string is used as argument for union() method.
      set1 = set("Hello")
      set2 = set1.union("World")
      print (set2)
      It will produce the following output 
      {'e', 'H', 'r', 'd', 'W', 'o', 'l'}

      Practice with Online Editor

      Note: This Python online Editor is a Python interpreter written in Rust, RustPython may not fully support all Python standard libraries and third-party libraries yet.
      Remember to save code(Ctrl + S Or Command + S) before run it.