Python program to repeat M characters of a string N times

Last Updated : 21 Mar, 2023

In this article, the task is to write a Python program to repeat M characters of string N times.

Method 1:

Define a function that will take a word, m, and n values as arguments.
If M is greater than the length of the word. Set m value equal to the length of the word
Now store the characters needed to be repeated into a string named repeat_string using slicing.
Initialize an empty string named as a result
Concatenate the repeat_string to result for n times.
Now print the string.

Below is the implementation:

Python3

   def repeat(word, m, n):
 
    # if number of characters greater than length of word.
    # set number of characters = length of word
    if(m > len(word)):
        m = len(word)
 
    repeat_word = word[:m]
    result = ""
 
    for i in range(n):
        result = result+repeat_word
    print(result)
 
 
# driver code
repeat("geeks", 2, 3)
 
  

Output:

gegege

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

Method 2:

Define a function that will take a word, m, n values as arguments.
if M is greater than length of word. set m value equal to the length of word.
Now store the characters needed to be repeated into a string named repeat_string using slicing.
Multiply the repeat_string with n.
Now print the string.

Python3

   def repeat(word, m, n):
   
    # if number of characters greater than length of word.
    # set number of characters = length of word
    if(m > len(word)):
        m = len(word)
         
    repeat_word = word[:m]
    print(repeat_word*n)
 
# driver code
repeat("geeks", 2, 3)
 
  

Output:

gegege

The time and space complexity for both methods are the same:

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

Method 3: Using itertools

Here’s another method that can be used to repeat M characters of a string N times using the itertools module in Python:

Python3

   import itertools
 
def repeat(word, m, n):
    if m > len(word):
        m = len(word)
         
    repeat_word = word[:m]
    result = "".join(itertools.islice(itertools.repeat(repeat_word), n))
    print(result)
 
# driver code
repeat("geeks", 2, 3)
 
  

Output

gegege

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

Method 4: Using operator.mul()+slicing

Approach

Define a function that will take a word, m, n values as arguments.
if M is greater than length of word. set m value equal to length of word.
Now store the characters needed to be repeated into a string named repeat_string using slicing.
Multiply the repeat_string with n.(using operator.mul())
Now print the string.

Python3

   def repeat(word, m, n):
 
    # if number of characters greater than length of word.
    # set number of characters = length of word
    if(m > len(word)):
        m = len(word)
         
    repeat_word = word[:m]
    import operator
    print(operator.mul(repeat_word,n))
 
# driver code
repeat("geeks", 2, 3)
 
  