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 coderepeat("Lazyroar", 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 coderepeat("Lazyroar", 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 itertoolsdef 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 coderepeat("Lazyroar", 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 coderepeat("Lazyroar", 2, 3) |
Output
gegege
The time and space complexity for both methods is the same:
Time Complexity : O(n)
Auxiliary Space : O(n)
