The problem of capitalizing a string is quite common and has been discussed many times. But sometimes, we might have a problem like this in which we need to convert the Nth character of the string to uppercase. Let’s discuss certain ways in which this can be performed.
Method #1 : Using string slicing + upper()
This task can easily be performed using the upper method which uppercases the characters provided to it and slicing can be used to add the remaining string after the uppercase Nth character.
Python3
# Python3 code to demonstrate working of# Uppercase Nth character# Using upper() + string slicing# initializing string test_str = "Lazyroar"# printing original string print("The original string is : " + str(test_str))# initializing N N = 4# Using upper() + string slicing# Uppercase Nth characterres = test_str[:N] + test_str[N].upper() + test_str[N + 1:]# printing result print("The string after uppercasing Nth character : " + str(res)) |
The original string is : Lazyroar The string after uppercasing Nth character : GeekSforGeeks
Method #2: Using lambda + string slicing + upper() The recipe of lambda function has to be added if we need to perform the task of handling None values or empty strings as well, and this becomes essential to handle edge cases.
Python3
# Python3 code to demonstrate working of# Uppercase Nth character# Using upper() + string slicing + lambda# initializing string test_str = "Lazyroar"# printing original string print("The original string is : " + str(test_str))# initializing N N = 4# Using upper() + string slicing + lambda# Uppercase Nth characterres = lambda test_str: test_str[:N] + test_str[N].upper() + test_str[N + 1:] if test_str else ''# printing result print("The string after uppercasing initial character : " + str(res(test_str))) |
The original string is : Lazyroar The string after uppercasing Nth character : GeekSforGeeks
Method #3 : Using replace() and upper() methods
Python3
# Python3 code to demonstrate working of# Uppercase Nth character# initializing stringtest_str = "Lazyroar"# printing original stringprint("The original string is : " + str(test_str))# initializing NN = 4# Uppercase Nth charactertest_str = test_str.replace(test_str[N],test_str[N].upper(),1)# printing resultprint("The string after uppercasing Nth character : " + str(test_str)) |
The original string is : Lazyroar The string after uppercasing Nth character : GeekSforGeeks
The Time and Space Complexity for all the methods are the same:
Time Complexity: O(n)
Auxiliary Space: O(n)
Method #4 : Without upper() method
Python3
# Python3 code to demonstrate working of# Uppercase Nth character# initializing stringtest_str = "Lazyroar"# printing original stringprint("The original string is : " + str(test_str))# initializing NN = 4res = ""loweralphabets = "abcdefghijklmnopqrstuvwxyz"upperalphabets = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"for i in range(0, len(test_str)): if(i == N): res += upperalphabets[loweralphabets.index(test_str[i])] else: res += test_str[i]# printing resultprint("The string after uppercasing Nth character : " + str(res)) |
The original string is : Lazyroar The string after uppercasing Nth character : GeekSforGeeks
Method #5 : Using maketrans() and translate()
Python3
# Python3 code to demonstrate working of# Uppercase Nth character# Using maketrans() and translate()# initializing stringtest_str = "Lazyroar"# printing original stringprint("The original string is : " + str(test_str))# initializing NN = 4# Uppercase Nth character using maketrans() and translate()lower_uppers = str.maketrans("abcdefghijklmnopqrstuvwxyz", "ABCDEFGHIJKLMNOPQRSTUVWXYZ")res = test_str[:N] + test_str[N].translate(lower_uppers) + test_str[N + 1:]# printing resultprint("The string after uppercasing Nth character : " + str(res))#This code is contributed by Edula Vinay Kumar Reddy |
The original string is : Lazyroar The string after uppercasing Nth character : GeekSforGeeks
Time Complexity: O(n)
Auxiliary Space: O(n)
Method #6: using list comprehension
Python3
# This code uses list comprehension to uppercase the Nth character of a given string.# initialize the stringtest_str = "Lazyroar"# print the original stringprint("The original string is : " + str(test_str))# initialize the Nth character to be uppercasedN = 4# create a new string with the Nth character uppercasedres = ''.join([char.upper() if i == N else char for i, char in enumerate(test_str)])# print the resultprint("The string after uppercasing Nth character : " + str(res)) |
The original string is : Lazyroar The string after uppercasing Nth character : GeekSforGeeks
Time Complexity: O(n)
Auxiliary Space: O(n)
Method#7:using re module
Python3
import re# Define the string to be testedtest_str = "Lazyroar"# Define the number NN = 4# Replace the Nth character of the string with its uppercase# f"^{test_str[:N]}{test_str[N]}" - regular expression pattern to match the string starting with first N characters, followed by the Nth character# f"{test_str[:N]}{test_str[N].upper()}" - replacement pattern, which is the first N characters followed by the Nth character in uppercase# test_str - the string to be modifiedres = re.sub(f"^{test_str[:N]}{test_str[N]}", f"{test_str[:N]}{test_str[N].upper()}", test_str)# Print the resultprint(res) |
GeekSforGeeks
Time Complexity: O(n)
Auxiliary Space: O(n)
Method#7:using string concatenation
Python3
# initializing stringtest_str = "Lazyroar"# printing original stringprint("The original string is : " + str(test_str))# initializing NN = 4# Using string concatenationres = test_str[:N] + test_str[N].upper() + test_str[N+1:]# printing resultprint("The string after uppercasing Nth character : " + str(res))#this code is contributed by Asif_Shaik |
The original string is : Lazyroar The string after uppercasing Nth character : GeekSforGeeks
Time Complexity: O(n)
Auxiliary Space: O(n)
