Python Revision

What is a lambda function in Python?

• A lambda function in Python is a small anonymous function defined using the lambda keyword. It can take any number of arguments, but can only have one expression.

• A lambda function in Python is a function that requires a return statement

• A lambda function in Python is a function that can only take one argument

• A lambda function in Python is a built-in function that performs mathematical operations

How can you add a key-value pair to a dictionary in Python?

• dictionary_name[key] = value

• dictionary_name.update(key, value)

• dictionary_name[key] += value

• dictionary_name.add(key, value)

What is the difference between append() and extend() methods in Python lists?

• append() adds multiple elements, extend() adds a single element

• append() and extend() are the same method with different names

• append() and extend() are used for removing elements from a list

• append() adds a single element, extend() adds multiple elements

What are *args and **kwargs in Python functions?

• *args and **kwargs are interchangeable and can be used interchangeably in Python functions.

• *args and **kwargs are reserved keywords in Python that cannot be used in functions.

• *args are used for keyword arguments, and **kwargs are used for non-keyword arguments in Python functions.

• *args are used for non-keyword arguments, and **kwargs are used for keyword arguments in Python functions.

Write a Python function to find the sum of all elements in a list using recursion.

• def sum_list(lst): if len(lst) == 0: return 0 else: return lst[0] + sum_list(lst[1:])

• def sum_list(lst): return lst[0] + sum_list(lst[1:])

• def sum_list(lst): return lst[0] + sum_list(lst)

• def sum_list(lst): return lst[0] + sum_list(lst[:-1])

How can you remove a key from a dictionary in Python?

• dictionary.pop(key)

• dictionary.remove(key)

• dictionary.clear(key)

• dictionary.delete(key)

What is the main difference between the pop() and clear() methods in Python lists?

• pop() method removes the last element of a list, while clear() method removes all elements from a list.

• pop() method removes the first element of a list, while clear() method removes the last element from a list.

• pop() method removes an element at a specified index, while clear() method removes all occurrences of a specified value.

• pop() method removes all elements from a list, while clear() method removes the last element of a list.

What is the purpose of using lambda functions in Python?

• To improve code readability by adding unnecessary complexity

• To create complex, multi-line functions

• To increase the efficiency of code execution

• To create small, anonymous functions for short-term use.

How can you check if a key exists in a dictionary in Python?

• dictionary.has_key(key)

• key not in dictionary

• key in dictionary

• dictionary[key]

What are the common methods used with Python lists?

• delete()

• pop()

• add()

• append()

• sort()