What is a variable in Python? Answer: A variable is a named reference to a value that can be used to store data in memory.
How do you define a variable in Python? Answer: Variables in Python are defined by assigning a value to a name using the “=” operator.
Is it necessary to declare the type of a variable in Python? Answer: No, Python is a dynamically-typed language, so you don't need to explicitly declare the type of a variable.
What is the purpose of a variable name? Answer: Variable names are used to reference and manipulate the stored values in memory.
What are the naming rules for Python variables? Answer: Variable names must start with a letter or an underscore and can contain letters, numbers, and underscores. They are case-sensitive.
Can a variable name start with a number in Python? Answer: No, a variable name must start with a letter or an underscore.
How do you assign a value to multiple variables simultaneously? Answer: You can assign values to multiple variables using multiple assignment or unpacking. For example: a, b = 1, 2.
What is the scope of a variable in Python? Answer: The scope of a variable defines where it can be accessed or referenced within a program. Variables can have local or global scope.
What is the difference between local and global variables? Answer: Local variables are defined within a specific function or block and are only accessible within that scope. Global variables are defined outside of any function or block and can be accessed from anywhere in the program.
How do you check the type of a variable in Python? Answer: You can use the built-in “type()” function to determine the type of a variable. For example: type(variable_name).
What are the different types of numeric variables in Python? Answer: The different types of numeric variables in Python are int (integer), float (floating-point), and complex (complex number).
How do you convert a string to an integer in Python? Answer: You can use the “int()” function to convert a string to an integer. For example: int(“10”).
What is the difference between “==” and “is” operators in Python? Answer: The “==” operator compares the values of two variables, while the “is” operator checks if two variables refer to the same object in memory.
How do you concatenate strings in Python? Answer: Strings can be concatenated using the “+” operator or by using string formatting techniques like f-strings or the “format()” method.
What is the None type in Python? Answer: The None type represents the absence of a value. It is often used to indicate the absence of a meaningful result or the default value of a variable.
How do you convert a string to a floating-point number in Python? Answer: You can use the “float()” function to convert a string to a floating-point number. For example: float(“3.14”).
What is the difference between a shallow copy and a deep copy of a variable? Answer: A shallow copy creates a new variable that references the same memory as the original variable. A deep copy creates a new variable and recursively copies all the values to new memory locations.
Can you change the value of a variable with a constant data type in Python? Answer: No, variables with constant data types like strings and tuples are immutable, meaning their values cannot be changed once assigned.