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Python program to remove each y occurrence before x in List
When it is required to remove every ‘y’ occurrence before ‘x’ in a list, a list comprehension along with the ‘index’ method are used.
Example
Below is a demonstration of the same
my_list = [4, 45, 75, 46, 66, 77, 48, 99, 10, 40, 5, 8]
print("The list is :")
print(my_list)
a, b = 8, 4
index_a = my_list.index(a)
my_result = [ele for index, ele in enumerate(my_list) if ele != b or (ele == b and index > index_a) ]
print("The resultant list is ")
print(my_result)Output
The list is : [4, 45, 75, 46, 66, 77, 48, 99, 10, 40, 5, 8] The resultant list is [45, 75, 46, 66, 77, 48, 99, 10, 40, 5, 8]
Explanation
A list is defined and is displayed on the console.
Two variables are assigned integer values.
The index of one of the variables is obtained.
This is assigned to a variable.
A list comprehension is used to iterate through the list, using ‘enumerate’.
A condition is placed to check if the element is equal to (or not) the second variable.
The result of this operation is assigned to a variable.
This is displayed as the output on the console.
Updated on: 14-Sep-2021
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