Advanced features of python function

Question 1

Recursion

Answer 1

Solves complex program

A function invoking itself within its function body

recursion limit can be set
sys.setrecursionlimit(100)

ensure that your recusion invocation is terminated based on some condition

Question 2

Iterator

Answer 2

Any object that responds to the built in next() function

Question 3

Generator

Answer 3

Infinite sequences cannot fit in a list because it won’t fit in Python memory

Generators are more memory efficient while generating infinite sequences

Simple way of creating iterators over a sequence

The object of generator is to create an iterator

generator contains It has a yield statement rather than a return statement

Infinite sequences used in for and while loops

it has a yield command in function body

invoking generator function, it return a generator object

The generator remembers the state of the local variables across function invocation

Question 4

Nested function

Answer 4

defined within the outer function

Question 5

closures

Answer 5

advanced programming construction decorator

A function nested is called closure

Nested function that can carry local state

closure can refer to local variables defined within outer functions

closure has access to local variables even when the outer function is no longer present in python memory

closures are used in implementing decorators

Question 6

decorator

Answer 6

decorator add functionality to existing code without modifying the code

decorates any msge

@decorator_1
@decorator_2
def some_function():
print(“Hello”)

Which of the following statement(s) is/are true?

This is referred to as chaining decorators and is valid

decorator_2 will be applied to the function first

Question 7

Recursive function

Answer 7

Decorators are technique to add functionality to code without modifying the code itself

Can be constructed in such a way that they can be used with functions which have any number of arguments

Are built using closure under the hood

A function which invokes itself within the function body

python has a limit of how many times a function can call itself

The limit is configurable

need to specify a terminating condition

recursive functions may or may not return values

Examples: Printing numbers in ascending order, Find the Fibonacci series