Remove a character from a Python string through index

Here, we will discuss how to remove a character from a string in Python by index in different ways and discuss some methods that could be used to perform them using Python. The following given topics we are going to cover

• How to remove a character from a Python string through index by using the slice and concatenation method
• How to remove a character from a Python string through index by using the native method
• How to remove a character from a Python string through index by using the replace method
• How to remove a character from a Python string through index by using the splitting method
• How to remove a character from a Python string through index by using the join and list comprehension method

How to remove a character from a Python string through index by using the slice and concatenation method

• In this example, we will discuss how to remove a character from a string through the index by using the slice and concatenation method in Python.
• To extract a slice of the elements from the collection of elements, use the slice() method in Python.
• By specifying their indices, users can access a specific range of elements. Using a string slice, one can trim the string before position I and after position i.
• Moreover, you can join two or more strings. String concatenation is the process of using operators or functions to combine two or more strings. By using the + operator we are going to concatenate two strings.

Example:

Let’s take an example and check how to remove a character from a Python string through an index by using the slice and concatenation method.

Source Code:

# Input String
state_name_in_USA = 'Alaska, Arizona, Alabama'
print("Input string: ",state_name_in_USA  )

# By using the slice and concatenation method
result = state_name_in_USA[:1] + state_name_in_USA[2:]

# Removing. character at 2nd index
print ("Removing character from second index in string : ", result)

Here is the implementation of the following given code.

This is how we can remove the character from a Python string through the index by using the slice and concatenation method.

Read: How to trim a string in Python

How to remove a character from a Python string through index by using the native method

• In this section, we will discuss How to remove a character from a Python string through an index by using the native method in Python.
• Here we will use the concept of for loop and append the characters as they occur, and create a new string from the initial for instances when the index is i.

Example:

# Input string
Bikes_in_USA = "Harley-Davidson, BMW"
print("Original string :",Bikes_in_USA )

# Removing element at index 3
result = ""
 
for m in range(len(Bikes_in_USA)):
    if m != 3:
        result = result + Bikes_in_USA[m]
 
# Display the Content
print ("Remove character from input string by index 3 : ", result)

In the following given code, we created an input string named ‘Bikes_in_USA’ and then create an empty string in which the new result will be stored. Next, we used the for loop and iterate the values.

You can refer to the below Screenshot.

As you can see in the Screenshot we have removed a character from a Python string through the index by using the native method.

Read: How to add zeros before a number in Python

How to remove a character from a Python string through index by using the replace method

• In this section, we will understand how to remove the character from a string through an index in Python by using the replace() method.
• When replacing a single character with a new character in Python, use the replace() method, and with this method, we will replace the character at the I index for the empty substring provided as (“).
• In this example, if we want to remove the character from the string then we have to mention the index number.

Syntax:

Let’s have a look at the syntax and understand the working of the str.replace() method in Python.

str.replace(old,  new, count)

• It consists of a few parameters
  • old:- This parameter defines the string which will be replaced.
  • new:- Replace the existing value with a new one (a character or a string).
  • count:- an integer value that indicates how many instances of the old character or substring you want to replace with the new one. It is an optional parameter.

Example:

Let’s take an example and check how to remove a character from a Python string through the index by using the replace method

Source Code:

def del_character(t, m):

    for l in range(len(t)):
        if l==m:
            t=t.replace(t[m],"",1)
    return t

Country_name = "U.S.A, China"
# Remove 3rd index character
m = 3
print(del_character(Country_name,m-1))

In the above code first, we define a function that takes a string and an index I then remove the character at that index. Next, we execute a loop from 0 to the length of the input string and check if the present iteration is equal to the index i. If identified, replace an empty string for the character at index i.

You can refer to the below Screenshot

In this example, we have understood How to remove a character from a Python string through the index by using the replace method.

Read:

Read: How to add zeros before a number in Python

How to remove a character from a Python string through index by using the splitting method

• The string will be divided into two halves in this method, one before index I and the other after index i. The string that will not contain the ith character can then be generated by combining these two strings.
• We’ll use the concept of slicing to split the string. When we specify the starting and ending indexes for a string, we can slice it into smaller items.
•  By using the slicing [i:] we will get the remaining string except for the selected character.

Example:

Let’s take an example and check how to remove a character from a Python string through an index by using the splitting method in Python.

Source Code:

def deletechar(n, m):
    val_1 = n[ : m]
    val_2 = n[m + 1: ]

    return val_1+val_2

Country_name = "United States of America"
print("Input string :", Country_name )
m = 4
print(deletechar(Country_name,m-1))

The string has been divided into two substrings, with each substring being stored in a separate variable. The two substrings have then been concatenated using the concatenation operator (+). Next, we have to pass m-1 the index in our given function.

Here is the execution of the following given code.

This is how to remove a character from a Python string through the index by using the splitting method in Python.

Read: Python program for binary search

How to remove a character from a Python string through index by using the join and list comprehension method

• In this section, we will discuss how to remove the character from the string through an index by using the list comprehension and the join() method.
• A string and an iterable object are concatenated using the join() method in Python. It returns a product string that combines all of the strings in the iterable.
• By using the list comprehension and join method we can easily involve splitting each string element into its associated list element, then joining each of them to declare a new string.
• In this method, each string element is first transformed into a list element, and then each of them is combined to create a string except the given index.

Example:

Here we will take an example and understand how to remove the character from the string through an index by using the list comprehension and the join() method.

Source Code:

Country_name = "U.S.A, Germany, Australia"
print ("Input string: ", Country_name)

# By using the join() method 
output = ''.join([Country_name [i] for i in range(len(Country_name )) if i != 2]) 


# Display the Content   
print ("Character remove from 2nd position: ",output) 

In the above code first, we created an input string named “Country_name” and within this, we assigned the country name to it. Next, we used the join() method and iterate the values with a set condition if i !=2 and in this example, i represents the index number.

Here is the Screenshot of the following given code

You may also like to read the following Python tutorials.

• Remove the last character from a string in Python
• How to Python Append List to Another List
• How to convert a set to a list in Python
• How to find perfect number in Python
• How to Sum Elements in List in Python using For Loop

In this article, we have discussed how to remove the character from a string in Python by index in different ways and discuss some methods that could be used to perform them using Python.

• How to remove a character from a Python string through index by using the slice and concatenation method
• How to remove a character from a Python string through index by using the native method
• How to remove a character from a Python string through index by using the replace method
• How to remove a character from a Python string through index by using the splitting method
• How to remove a character from a Python string through index by using the join and list comprehension method