Exploring Dictionaries and Arrays in Python

How do you create a dictionary in Python?

• my_dict = (key1: value1, key2: value2)

• You can create a dictionary in Python using curly braces, like this: my_dict = {'key1': 'value1', 'key2': 'value2'}.

• my_dict = 'key1:value1;key2:value2'

• my_dict = ['key1', 'value1', 'key2', 'value2']

What method would you use to access a value in a dictionary using its key?

• Use dictionary[key]

• Use dictionary.key()

• Access value with dictionary.key

• Use dictionary.get(key)

Explain how to create a nested dictionary in Python.

• Use a syntax like `nested_dict = {'key1': {'subkey1': 'value1', 'subkey2': 'value2'}}`.

• Create a nested dictionary by using a list of tuples.

• Use a syntax like `nested_dict = {'key1': 'value1', 'key2': 'value2'}`.

• Define a nested dictionary with `nested_dict = {'key1': ['value1', 'value2']}`.

What is a multidimensional array and how is it represented in Python?

• In Python, a multidimensional array is represented as a dictionary, e.g., {'row1': [1, 2, 3], 'row2': [4, 5, 6]}

• A multidimensional array is a type of variable that can only hold strings in Python.

• A multidimensional array is a single list of numbers, e.g., [1, 2, 3, 4, 5, 6].

• In Python, a multidimensional array can be represented as a list of lists, e.g., [[1, 2, 3], [4, 5, 6]].

Describe a technique to manipulate elements in a multidimensional array.

• Use a single loop to access elements in a multidimensional array.

• Use nested loops to access and manipulate elements in a multidimensional array.

• Apply a sorting algorithm to rearrange the array elements.

• Manipulate elements by directly indexing without loops.

How can you iterate through a one-dimensional array in Python?

• Use a for loop: for element in array: print(element)

• Use a map function: map(print, array)

• Use a while loop: while index < len(array): print(array[index])

• Use a list comprehension: [print(element) for element in array]

What is the syntax to add a new key-value pair to an existing dictionary?

• dictionary_name.set(new_key, new_value)

• dictionary_name[new_key] = new_value

• dictionary_name.add(new_key, new_value)

• dictionary_name[new_key] => new_value

How do you retrieve all keys from a dictionary?

• Use `dict.all_keys()` to get all keys from a dictionary.

• Access keys by iterating through the dictionary directly.

• Use `dict.keys()` to retrieve all keys from a dictionary.

• Use `dict.get()` to retrieve all keys from a dictionary.

What is the difference between a list and a multidimensional array in Python?

• A list is always sorted; a multidimensional array is unsorted.

• A list is a fixed size; a multidimensional array can change size dynamically.

• A list is one-dimensional; a multidimensional array can have multiple dimensions.

• A list can only contain numbers; a multidimensional array can contain any data type.

How can you access an element in a nested dictionary?

• Access the element with dict.get('key1').get('key2') method.

• Use dict['key1']['key3'] to access the nested element.

• Use the syntax dict['key1']['key2'] to access the nested element.

• Use dict.key1.key2 to access the nested element.