Python – Uppercase Half String

Given a String, perform uppercase of later part of string. 

Input : test_str = ‘geeksforgeek’ Output : geeksfORGEEK Explanation : Latter half of string is uppercased. Input : test_str = ‘apples’ Output : appLES Explanation : Latter half of string is uppercased.

Method #1 : Using upper() + loop + len()

In this, we compute the half index, and then perform upper() to only those characters which lie in other half of string.

Python3

# Python3 code to demonstrate working of
# Uppercase Half String
# Using upper() + loop + len()

# initializing string
test_str = 'geeksforgeeks'

# printing original string
print("The original string is : " + str(test_str))

# computing half index
hlf_idx = len(test_str) // 2

res = ''
for idx in range(len(test_str)):

    # uppercasing later half
    if idx >= hlf_idx:
      res += test_str[idx].upper()
    else :
      res += test_str[idx]

# printing result
print("The resultant string : " + str(res))

Output

The original string is : geeksforgeeks
The resultant string : geeksfORGEEKS

Method #2 : Using list comprehension + join() + upper()

This is similar to above method, just the task is performed in shorthand manner using list comprehension.

Python3

# Python3 code to demonstrate working of
# Uppercase Half String
# Using list comprehension + join() + upper()

# initializing string
test_str = 'geeksforgeeks'

# printing original string
print("The original string is : " + str(test_str))

# computing half index
hlf_idx = len(test_str) // 2

# join() used to create result string
res = ''.join([test_str[idx].upper() if idx >= hlf_idx else test_str[idx]
         for idx in range(len(test_str)) ])

# printing result
print("The resultant string : " + str(res))

Output

The original string is : geeksforgeeks
The resultant string : geeksfORGEEKS

Method#3: Using String slicing and upper()

Use string slicing to divide the string into two separate sub_string and convert the right sub_string to the upper case with upper() method. 

Python3

# Python3 code to demonstrate working of
# Uppercase Half String
# Using upper() + slicing string

# initializing string
test_str = 'geeksforgeeks'

# printing original string
print("The original string is : " + str(test_str))

# computing half index
hlf_idx = len(test_str) // 2

# Making new string with half upper case
# Using slicing
# slicing takes one position less to ending position provided
res = test_str[:hlf_idx] + test_str[hlf_idx:].upper()

# printing result
print("The resultant string : " + str(res))

Output:

The original string is : geeksforgeeks
The resultant string : geeksfORGEEKS