##### Python coding questions and answers for Apptitude
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Python coding questions and answers for Apptitude on topics various topics covering.

1. Write a function that takes a list of integers and returns the sum of the integers.
``````Copy codedef sum_list(numbers):
total = 0
for number in numbers:
total += number
``````
1. Write a function that takes a list of strings and returns a new list with all strings converted to uppercase.
``````Copy codedef to_upper(strings):
return [string.upper() for string in strings]
``````
1. Write a fAunction that takes a list of integers and returns a new list with only the odd integers.
``````Copy codedef odd_numbers(numbers):
return [number for number in numbers if number % 2 == 1]
``````
1. Write a function that takes a list of integers and returns the maximum value.
``````Copy codedef max_value(numbers):
return max(numbers)
``````
1. Write a function that takes a list of integers and returns True if the list is sorted in ascending order, False otherwise.
``````Copy codedef is_sorted(numbers):
return numbers == sorted(numbers)
``````
1. Write a function that takes a string and returns a new string with all vowels removed.
``````Copy codedef remove_vowels(string):
vowels = 'aeiouAEIOU'
return ''.join([char for char in string if char not in vowels])
``````
1. Write a function that takes a list of strings and a string and returns the index at which the string is found in the list, or -1 if the string is not found.
``````Copy codedef find_index(strings, target):
try:
return strings.index(target)
except ValueError:
return -1
``````
1. Write a function that takes a list of integers and returns the mean (average) of the list.
```Copy code```def mean(numbers):
return sum(numbers) / len(numbers)
``````
1. Write a function that takes two lists of integers and returns a new list containing the elements that are present in both lists.
``````Copy codedef intersect(list1, list2):
return [value for value in list1 if value in list2]
``````
1. Write a function that takes a list of integers and returns a new list with the integers sorted in descending order.
``````Copy codedef sort_descending(numbers):
return sorted(numbers, reverse=True)``````

##### Python coding questions on swapping
1. Write a function that takes two integers and swaps their values.
``````Copy codedef swap(a, b):
a, b = b, a
return a, b
``````
1. Write a function that takes a list of integers and swaps the first and last elements of the list.
``````Copy codedef swap_first_last(numbers):
if len(numbers) > 1:
numbers, numbers[-1] = numbers[-1], numbers
return numbers
``````
1. Write a function that takes a dictionary and swaps the keys and values.
``````Copy codedef swap_keys_values(dictionary):
return {value: key for key, value in dictionary.items()}
``````
1. Write a function that takes a list of strings and swaps the first and last elements of each string.
``````Copy codedef swap_first_last_string(strings):
return [string[-1] + string[1:-1] + string if len(string) > 1 else string for string in strings]``````

##### Python coding questions on String operations
1. Write a function that takes a string and returns a new string with all vowels removed.
``````Copy codedef remove_vowels(string):
vowels = 'aeiouAEIOU'
return ''.join([char for char in string if char not in vowels])
``````
1. Write a function that takes a string and returns a new string with all occurrences of a specific character removed.
``````Copy codedef remove_char(string, char):
return ''.join([c for c in string if c != char])
``````
1. Write a function that takes a string and returns True if the string is a palindrome (reads the same backwards and forwards), False otherwise.
``````Copy codedef is_palindrome(string):
return string == string[::-1]
``````
1. Write a function that takes a string and returns a new string with all characters in the string converted to lowercase and all spaces removed.
``````Copy codedef lowercase_no_spaces(string):
return ''.join([c for c in string.lower() if c != ' '])
``````
1. Write a function that takes a string and returns a new string with the characters in the string reversed.
``````Copy codedef reverse_string(string):
return string[::-1]``````

##### Python coding questions on sorting
1. Write a function that takes a list of integers and returns the list sorted in ascending order.
``````Copy codedef sort_ascending(numbers):
return sorted(numbers)
``````
1. Write a function that takes a list of strings and returns the list sorted in alphabetical order.
``````Copy codedef sort_alphabetically(strings):
return sorted(strings)
``````
1. Write a function that takes a list of dictionaries and returns the list sorted by the value of a specific key in the dictionaries.
``````Copy codedef sort_by_key(dictionaries, key):
return sorted(dictionaries, key=lambda x: x[key])
``````
1. Write a function that takes a list of integers and returns the list sorted in descending order.
``````Copy codedef sort_descending(numbers):
return sorted(numbers, reverse=True)
``````
1. Write a function that takes a list of tuples and returns the list sorted by the second element in each tuple.
``````Copy codedef sort_by_second_element(tuples):
return sorted(tuples, key=lambda x: x)

``````

##### Python coding questions on time complexity
1. Write a function that takes a list of integers and returns the sum of the squares of the integers. The function should have a time complexity of O(n).
``````Copy codedef sum_square(numbers):
total = 0
for number in numbers:
total += number ** 2
``````
1. Write a function that takes two strings and returns True if the strings are anagrams (contain the same characters), False otherwise. The function should have a time complexity of O(n).
``````Copy codedef is_anagram(string1, string2):
if len(string1) != len(string2):
return False
return sorted(string1) == sorted(string2)
``````
1. Write a function that takes a list of integers and returns the second-largest element in the list. The function should have a time complexity of O(n).
``````Copy codedef second_largest(numbers):
largest = max(numbers)
numbers.remove(largest)
return max(numbers)
``````
1. Write a function that takes a list of strings and returns the longest string in the list. The function should have a time complexity of O(n).
``````Copy codedef longest_string(strings):
longest = ''
for string in strings:
if len(string) > len(longest):
longest = string
return longest
``````
1. Write a function that takes a list of integers and returns True if the list contains any duplicate elements, False otherwise. The function should have a time complexity of O(n).
``````Copy codedef has_duplicates(numbers):
return len(numbers) != len(set(numbers))``````

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