Python Variables

What is a variable in Python?

• A variable in Python is a reserved memory location to store values.

• A variable in Python is a mathematical equation

• A variable in Python is a type of snake

• A variable in Python is a programming language

How do you declare a variable in Python?

• variable_name = value

• value : variable_name

• value = variable_name

• variable_name : value

What are the rules for naming a variable in Python?

• Variable names in Python can only contain letters, numbers, and underscores. They cannot start with a number and cannot be a reserved keyword. Variable names are case-sensitive.

• Variable names in Python can start with a number

• Variable names in Python must be at least 10 characters long

• Variable names in Python can contain special characters like @, $, and %

What is the difference between local and global variables in Python?

• Local variables are defined within a function scope, while global variables are defined outside of any function scope.

• Local variables can be modified by any function, while global variables are read-only.

• Local variables are defined outside of any function scope, while global variables are defined within a function scope.

• Local variables are accessible from any function within the program, while global variables are only accessible within the function they are defined.

What is variable scope in Python?

• Local scope in Python refers to variables defined outside of a function.

• Global scope in Python refers to variables defined within a function.

• Variable scope in Python refers to the visibility of variables within different parts of a program. There are mainly two types of variable scopes in Python: local scope and global scope. Local scope refers to variables defined within a function and are only accessible within that function. Global scope refers to variables defined outside of any function and can be accessed from anywhere within the program.

• Variable scope in Python refers to the color of variables within different parts of a program.

Explain the concept of variable assignment in Python.

• Variable assignment in Python is the process of binding a name to a function.

• In Python, variable assignment is done by using the 'equals' sign followed by the variable name.

• Variable assignment in Python is not necessary as variables are automatically assigned.

• Variable assignment in Python is the process of binding a name to a value. For example, 'x = 5' assigns the value 5 to the variable x.

What are the different data types that a variable can hold in Python?

• characters

• arrays

• integers, floats, strings, booleans, lists, tuples, dictionaries

• functions

How do you reassign a value to a variable in Python?

• variable_name == new_value

• variable_name = new_value

• variable_name : new_value

• variable_name = new_value

What is the purpose of the 'del' statement in Python?

• To add a new item to a list

• To delete an item from a list or a key-value pair from a dictionary.

• To modify the value of a key in a dictionary

• To create a new list

Explain the concept of variable unpacking in Python.

• Variable unpacking only works with integers in Python.

• Variable unpacking makes code more complex and harder to read.

• Variable unpacking simplifies the process of assigning values to variables and makes code more concise and readable.

• Variable unpacking is not supported in Python.