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Python Program to remove a specific digit from every element of the list
• Difficulty Level : Hard
• Last Updated : 13 Jan, 2021

Given list of elements, the task here is to write a Python program that can remove presence of all a specific digit from every element and then return the resultant list.

Examples:

Input : test_list = [333, 893, 1948, 34, 2346], K = 3
Output : [”, 89, 1948, 4, 246]
Explanation : All occurrences of 3 are removed.

Input : test_list = [345, 893, 1948, 34, 2346], K = 5
Output : [34, 893, 1948, 34, 2346]
Explanation : All occurrences of 5 are removed.

Method 1 : Using loop, str() and join()

In this, we perform the task of reforming elements by converting them to string and checking for each digit and ignoring while joining to get new element. Lastly each element is converted to integer using int().

Example:

## Python3

 `# initializing list``test_list ``=` `[``345``, ``893``, ``1948``, ``34``, ``2346``]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# initializing K``K ``=` `3`` ` `res ``=` `[]``for` `ele ``in` `test_list:`` ` `    ``# joining using join(),``    ``if` `list``(``set``(``str``(ele)))[``0``] ``=``=` `str``(K) ``and` `len``(``set``(``str``(ele))) ``=``=` `1``:``        ``res.append('')``    ``else``:``        ``res.append(``int``(''.join([el ``for` `el ``in` `str``(ele) ``if` `int``(el) !``=` `K])))`` ` `# printing result``print``(``"Modified List : "` `+` `str``(res))`

Output:

The original list is : [345, 893, 1948, 34, 2346]

Modified List : [45, 89, 1948, 4, 246]

Method 2 : Using list comprehension, int(), str() and join()

Similar to above method, joining is done using join() and interconversion is performed using int() and str().

Example:

## Python3

 `# initializing list``test_list ``=` `[``345``, ``893``, ``1948``, ``34``, ``2346``]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# initializing K``K ``=` `3`` ` `# list comprehension performing task as one liner``res ``=` `['' ``if` `list``(``set``(``str``(ele)))[``0``] ``=``=` `str``(K) ``and` `len``(``set``(``str``(ele))) ``=``=` `1` `else` `int``(``    ``''.join([el ``for` `el ``in` `str``(ele) ``if` `int``(el) !``=` `K])) ``for` `ele ``in` `test_list]`` ` `# printing result``print``(``"Modified List : "` `+` `str``(res))`

Output:

The original list is : [345, 893, 1948, 34, 2346]

Modified List : [45, 89, 1948, 4, 246]

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