replace_inside_parentheses

Code

def replace_inside_parentheses(string, find_string, replace_string):
    bracket_count = 0
    return_string = ""
    for a in string:
        if a == "(":
            bracket_count += 1
        elif a == ")":
            bracket_count -= 1
        if bracket_count > 0:
            return_string += a.replace(find_string, replace_string)
        else:
            return_string += a
    return return_string


my_str = "decimal(12,01)"
print(my_str)

print(replace_inside_parentheses(my_str, ",", "%"))