Mastering Python Data Structures

What is the main difference between a list and a tuple in Python?

• Tuples are created using square brackets while lists use parentheses.

• Lists are faster than tuples in all operations.

• The main difference is that lists are mutable and tuples are immutable.

• Lists can contain only numbers while tuples can contain any data type.

How do you add a new key-value pair to a dictionary?

• dictionary_name.insert(new_key, new_value)

• Use dictionary_name[new_key] = new_value.

• dictionary_name.append(new_key: new_value)

• dictionary_name.add(new_key, new_value)

What is a set in Python and how does it differ from a list?

• A set is a collection of unique elements, while a list is an ordered collection that can contain duplicates.

• A set is an ordered collection of elements, while a list is a collection of unique items.

• A set can contain duplicates, whereas a list cannot.

• A set is a mutable collection, while a list is immutable.

How to define a Function in Python?

• Functions in Python cannot take parameters.

• Functions are only used for mathematical calculations.

• To define a function in Python, use the syntax: 'def function_name(parameters):' followed by the indented function body.

• You define a function using 'function_name(parameters)'.

What is the significance of the 'import' statement in Python modules?

• The 'import' statement is a way to comment code in Python.

• The 'import' statement is used to define functions in Python.

• The 'import' statement is only necessary for built-in modules.

• The 'import' statement is significant for code reuse and modular programming in Python and allows to import external modules.

How do you create a class in Python and instantiate an object from it?

• class MyClass: def __init__(self): pass obj = MyClass()

• MyClass obj = new MyClass();

• def MyClass(): pass

• class MyClass() {}

What method would you use to convert a string to lowercase in Python?

• .upper()

• .lower()

• strip()

• capitalize()

How can you access the value associated with a specific key in a dictionary?

• Call dictionary_name.value(key) to find the value.

• Use dictionary_name[key] to access the value.

• Access the value with dictionary_name[keys] where keys is a list.

• Use dictionary_name.get(key) to retrieve the value.

What are the advantages of using tuples over lists in Python?

• Tuples can be modified after creation.

• Advantages of using tuples over lists include immutability, lower memory usage, ability to be used as dictionary keys, and simpler syntax.

• Lists use less memory than tuples.

• Tuples cannot be used as keys in dictionaries.

How do you handle exceptions in Python using try and except blocks?

• Use try to wrap the code that may raise an exception, and use except to define how to handle the exception.

• Ignore exceptions and let the program crash.

• Wrap all code in a single except block regardless of the exception type.

• Use only try without except to handle exceptions.