What is a closure in Python?
Answer: A closure is a function object that has access to variables in its enclosing lexical scope, even when the function is called outside that scope.

How is a closure created in Python?
Answer: A closure is created by defining a nested function that references variables from the outer function's scope.

What is the purpose of using closures in Python?
Answer: Closures allow data encapsulation, provide a way to implement function factories, and can be used for maintaining state across multiple function calls.

How do you define a closure in Python?
Answer: Define an outer function that contains a nested function that references variables from the outer function, then return the nested function.

What is the difference between a closure and a regular function in Python?
Answer: A closure is a function object that remembers values in the enclosing scope, whereas a regular function does not retain any memory of variables from previous invocations.

How does a closure retain the values of variables?
Answer: When a closure is created, it keeps a reference to the variables in its enclosing scope, even if the enclosing function has finished executing.

Can closures modify variables in their enclosing scope?
Answer: Yes, closures have access to the variables in their enclosing scope and can modify them if they are mutable.

How can you access variables from the enclosing scope within a closure?
Answer: Variables from the enclosing scope can be accessed by referencing them directly within the closure's code.

What is a free variable in a closure?
Answer: A free variable is a variable that is referenced within a closure but is not defined within the closure itself.

How does a closure differ from a global variable?
Answer: A closure keeps the variables local to its enclosing scope, while a global variable is accessible from anywhere in the program.

Can you pass arguments to a closure in Python?
Answer: Yes, closures can accept arguments just like regular functions.

What happens when a closure is returned from its defining function?
Answer: When a closure is returned, it maintains its access to the variables in the enclosing scope even after the enclosing function has finished executing.

How can you check if a function is a closure in Python?
Answer: You can check if a function is a closure by using the inspect.isclosure() function from the inspect module.

Can you create a closure without using a nested function?
Answer: No, a closure in Python requires a nested function to reference variables from the enclosing scope.

Are closures used frequently in Python programming?
Answer: While closures can be powerful, they are not used as frequently as other language features in Python.

Can a closure access variables defined in other closures?
Answer: No, a closure can only access variables from its immediate enclosing scope, not variables from other closures.

How does a closure help with data encapsulation?
Answer: Closures allow you to encapsulate data by keeping it private within the scope of the closure, preventing direct access from outside.

What is the lifespan of a closure in Python?
Answer: The lifespan of a closure is determined by the lifespan of its defining function. Once the defining function has finished executing, the closure can still be invoked as long as it is referenced.

Can a closure reference variables from multiple enclosing scopes?
Answer: Yes, a closure can reference variables from multiple enclosing scopes as long as those scopes are in the chain of its lexical environments.

How can you delete a closure in Python?
Answer: You cannot explicitly delete a closure in Python.