To reverse a string without changing the order of special characters (e.g., commas, punctuation), you can follow this approach:Identify the alphanumeric characters in the string.
Reverse only the alphanumeric characters while keeping the special characters in their original positions.

def reverse_string_keep_special(s):

# Convert string to a list to modify characters
s_list = list(s)
# Find all alphanumeric characters (ignoring special ones)
alnum_chars = [c for c in s_list if c.isalnum()]
# Reverse only the alphanumeric characters
i = 0
j = len(alnum_chars) - 1
while i < len(s_list):
 if s_list[i].isalnum(): # Place reversed alphanumeric characters
        s_list[i] = alnum_chars[j]
        j -= 1
    i += 1
# Join the list back into a string
return ''.join(s_list)

Example

input_str = “a,b$c”
result = reverse_string_keep_special(input_str)
print(result) # Output will be: “c,b$a”