Add a character to a specific position in a string using Python

In this article, we will learn how to add a character to a specific position in a string in Python.

Methods Used

The following are the various methods to accomplish this task −

• Using the ‘+’ operator

• Using join() function

• Using format() function

Method 1: Using the ‘+’ operator

We can concatenate strings and characters using the symbol "+" at the required positions.

Adding Character at the End of a String

Algorithm 

Following are the Algorithms/steps to be followed to perform the desired task. −

• Create a variable to store an input string.

• Use the “+” operator to add a character at the end of an input string.

• Print the resultant string.

You can also add a character at the specific position and starting of a string by using indexing with the “+” operator as shown in the following examples.

Example

The following program adds a character at the end of an input string using the ‘+’ operator −

# input string
inputString = "tutorialspoin"

# adding a character at the end of an input string using the + operator
inputString = inputString + 't' 

# printing the resultant string
print("Adding 't' at the end of an input string:\n", inputString)

Output

On execution, the above program will generate the following output −

Adding 't' at the end of an input string:
 tutorialspoint

Adding Character at a Specific Position

Example

The following program adds a character at the specific position of an input string using the ‘+’ operator −

# input string
inputString = "tutorialsoint"

# adding character 'p' at a specific position i.e, at index 9
inputString = inputString[:9] + 'p' + inputString[9:]

# printing the resultant string 
print("Adding 'p' at 9th index of an input string:\n", inputString)

Output

Adding 'p' at 9th index of an input string:
 tutorialspoint

Adding Character at Starting Position of a String

Example

The following program adds a character at the start of an input string using the ‘+’ operator −

# input string
inputString = "utorialspoint"

# adding character 't' at the start of an input string
inputString = 't' + inputString

# printing the resultant string 
print("Adding 't' at the starting of an input string:\n", inputString)

Output

Adding 't' at the starting of an input string:
 tutorialspoint

Method 2: Using the join() function

Using the join() function in Python, it is also feasible to concatenate characters at required positions inside a string. You can insert characters wherever in the string, whether it's in the middle, the beginning, or the end.

Algorithm 

Following are the Algorithms/steps to be followed to perform the desired task. −

• Use the join() function to join a character at the end of an input string.

• join() is a string function in Python that is used to join elements of a sequence that are separated by a string separator. This function connects sequence elements to form a string.

• Print the resultant string.

In the same way, join the characters at the specific position and starting of a string using indexing.

Example

The following program adds a character at the end, a specific position, and the start of an input string using the join() function −

# input string 1
inputString_1 = "tutorialspoin"

# joining a character at the end of an input string using the join() function 
inputString_1 = ''.join((inputString_1,'t')) 
# printing the resultant string
print("Adding 't' at the end of an inputString_1:\n", inputString_1)

# input string 2
inputString_2 = "tutorialsoint"
# joining character 'p' at a specific position i.e, at index 9
inputString_2 = ''.join((inputString_2[:9],'p',inputString_2[9:])) 
print("Adding 'p' at 9th index of an inputString_2:\n", inputString_2)

inputString_3 = "utorialspoint"
# joining character 't' at the starting of an input string
inputString_3 = ''.join(("t",inputString_3)) 
print("Adding 't' at the starting of an inputString_3:\n", inputString_3)

Output

Adding 't' at the end of an inputString_1:
 tutorialspoint
Adding 'p' at 9th index of an inputString_2:
 tutorialspoint
Adding 't' at the starting of an inputString_3:
 tutorialspoint

Method 3: Using the format() function

Python's format() function can be used to add characters to a specific position in a string. Python also employs it for string formatting.

Adding Character at the end of a String

Algorithm 

Following are the Algorithms/steps to be followed to perform the desired task. −

• Use the format() function to add a character at the end of an input string by formatting it at the last index.

• Print the resultant string.

• In the same way, add the characters at the specific position and starting of a string by formatting it at the required indexes using the format() function.

Example

The following program adds a character at the end of an input string using the format() function −

# input string 1
inputString_1 = "tutorialspoin"

# adding a character at the end of an input string using the format() function 
inputString_1 = "tutorialspoin{}".format('t')

print("Adding 't' at the end of an inputString_1:\n", inputString_1)

Output

Adding 't' at the end of an input string:
 tutorialspoint

Adding Character at a Specific Position

Example

The following program adds a character at the end of an input string using the format() function −

# input string 2
inputString_2 = "tutorialsoint"

# adding character 'p' at a specific position i.e, at index 9
# by formatting it using format() function
inputString_2= "tutorials{}oint".format('p')

# printing the resultant string
print("Adding 'p' at 9th index of an inputString_2:\n", inputString_2)

Output

Adding 'p' at 9th index of an inputString_2:
 tutorialspoint

Adding Character at Starting Position of a String

Example

The following program adds a character at the end of an input string using the format() function −

# input string 3
inputString_3 = "utorialspoint"

# adding character 't' at the starting of an inputString_3
# by formatting it at index 0 
inputString_3 = "{}utorialspoint".format('t') 

# printing the resultant string
print("Adding 't' at the starting of an inputString_3:\n", inputString_3)

Output

Adding 't' at the starting of an inputString_3:
 tutorialspoint

Conclusion

Through the use of the join(), + operator, and format() functions, we learned how to add a character to a certain position in a string using three different approaches in this article. We may join any list, tuple, or other data type to a string with a delimiter using the join() method.