Python | Deleting all occurrences of character

These days string manipulation is very popular in Python, and due to its immutable character, sometimes, it becomes more important to know its working and hacks. This particular article solves the problem of deleting all occurrences of a character from a string. Let’s discuss ways in which this can be achieved. 

Method #1: Using translate() Usually this function is used to convert a particular character to some other character. By translating the resultant removal character to “None”, this function can perform this task. This function works only for Python2 

The original string is : Lazyroar
The string after character deletion : GksforGks

Time Complexity: O(n)
Auxiliary Space : O(n)

Method #2: Using replace() This function works functionally quite similar to the above function, but it is recommended due to several reasons. It can be used in newer versions of Python and is more efficient than the above function. We replace the empty string instead of None as above for using this function to perform this task. 

The original string is : Lazyroar
The string after character deletion : GksforGks

Time Complexity: O(n)
Auxiliary Space: O(n)

Method #3: Without using any built-in methods

The original string is : Lazyroar
The string after character deletion : GksforGks

Time Complexity: O(n)
Auxiliary Space : O(n)

Method #4: Using List comprehension

List comprehension is a concise way of creating lists in Python. It allows you to create a new list by applying a certain operation to each element of an existing iterable (e.g. a list, tuple, set, etc.). In this case, in Method #4, we use list comprehension to delete all occurrences of a specific character from a string.

The original string is : Lazyroar
The string after character deletion : GksforGks

Time Complexity: O(n)
Auxiliary Space: O(n)

METHOD 5:Using re module.

APPROACH:

In this Approach , we define the input string and the target character as variables. Then, we call the delete_all_occurrences_5() function with the input string and target character as arguments. The function uses the re.sub() method to delete all occurrences of the target character from the string. Finally, we print the original and modified strings using print()

ALGORITHM:

1.Call re.sub(char, ”, string) to delete all occurrences of the target character from the input string.
2.Assign the modified string to the output_string variable.
3.Return the output_string.

The original string is : Lazyroar
The string after character deletion : GksforGks

Time Complexity: O(n), where n is the length of the input string.
Space Complexity: O(n), where n is the length of the input string