Python – Get the indices of Uppercase characters in given string

Given a String extract indices of uppercase characters.

Input : test_str = ‘GeeKsFoRGeeks’
Output : [0, 3, 5, 7, 8]
Explanation : Returns indices of uppercase characters.

Input : test_str = ‘GFG’
Output : [0, 1, 2]
Explanation : All are uppercase.

Method #1 : Using list comprehension  + range() + isupper()

In this we iterate through the indices till string length, and check for uppercase character using isupper(), if found, index is recorded.

Python3

# Python3 code to demonstrate working of
# Uppercase Indices
# Using list comprehension + range() + isupper()

# initializing string
test_str = 'GeeKsFoRGEEks'

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

# Uppercase check using isupper()
res = [idx for idx in range(len(test_str)) if test_str[idx].isupper()]

# printing result
print("Uppercase elements indices : " + str(res))

Output

The original string is : GeeKsFoRGEEks
Uppercase elements indices : [0, 3, 5, 7, 8, 9, 10]

Method #2 : Using enumerate() + isupper()

In this, the indices are captured using enumerate(), and isupper() does task of uppercase check as in above method.

Python3

# Python3 code to demonstrate working of
# Uppercase Indices
# Using enumerate() + isupper()

# initializing string
test_str = 'GeeKsFoRGEEks'

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

# Uppercase check using isupper()
# enumerate() gets indices
res = [idx for idx, chr in enumerate(test_str) if chr.isupper()]

# printing result
print("Uppercase elements indices : " + str(res))

Output

The original string is : GeeKsFoRGEEks
Uppercase elements indices : [0, 3, 5, 7, 8, 9, 10]