Python | Difference between two lists

There are various ways in which difference between two lists can be generated. In this article, we will see two most important ways in which this can be done. One by using the set() method, and another by not using it.
Examples:

          Input :
list1 = [10, 15, 20, 25, 30, 35, 40]
list2 = [25, 40, 35] 
Output :
[10, 20, 30, 15]
Explanation:
resultant list = list1 - list2
          
  1. By the use of set()
    In this method we convert the lists into sets explicitly and then simply reduce one from the other using the subtract operator. For more reference on set visit Sets in Python.
    Example:

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    # Python code t get difference of two lists
    # Using set()
    def Diff(li1, li2):
        return (list(set(li1) - set(li2)))
      
    # Driver Code
    li1 = [10, 15, 20, 25, 30, 35, 40]
    li2 = [25, 40, 35]
    print(Diff(li1, li2))

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    Output :



    [10, 20, 30, 15]
  2. Without using the set()
    In this method, we use the basic combination technique to copy elements from both the list with a regular check if one is present in the other or not.

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    # Python code t get difference of two lists
    # Not using set()
    def Diff(li1, li2):
        li_dif = [i for i in li1 + li2 if i not in li1 or i not in li2]
        return li_dif
      
    # Driver Code
    li1 = [10, 15, 20, 25, 30, 35, 40]
    li2 = [25, 40, 35]
    li3 = Diff(li1, li2)
    print(li3)

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    Output :

    [10, 20, 30, 15]


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