1. Function to return longest string in a list

def get_longest_string(lst):
    longest_str = ''
    for s in lst:
        if len(longest_str) < len(s):
            longest_str = s
    return (longest_str, len(longest_str))

lst = ['Harish', 'Sandilya', 'Avadhanam']

get_longest_string(lst)

('Avadhanam', 9)

2. Function to remove nth index from a non empty string

s = 'some string to use'

def remove_nth_char_from_string(string, index):
    str1 = string[:index]
    str2 = string[index+1:]
    return str1+str2

remove_nth_char_from_string(s, 10)

'some strin to use'

3. Function to get the last part of a string before a specified character

s = 'some string to use'

def last_part_of_a_str_b4_specified_charecter(string, char):
    index = s.rfind(char)
    return string[:index]

last_part_of_a_str_b4_specified_charecter(s, 'u')

'some string to '

4. Function to sort a string lexicographically

s = 'this is a sample string to demonstrate string lexicographical sorting'

def lex_sort(string):
    words = string.split()
    words.sort()
    return words

lex_sort(s)

['a',
 'demonstrate',
 'is',
 'lexicographical',
 'sample',
 'sorting',
 'string',
 'string',
 'this',
 'to']

5. Function to remove spaces in a string

s = 'This Is A Sample String Used To Pass To A Function To Remove Spaces'

def remove_spaces(string):
    return s.replace(' ','')

remove_spaces(s)

'ThisIsASampleStringUsedToPassToAFunctionToRemoveSpaces'