ITERATORS GENERATORS DECORATORS Cheat Sheet

A Programming › Python cheat sheet in English by sahusourabh

This explains Iterators, Generators and decorators in one page

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PRs

ITERATORS

Looping

Important functions to be implemented

__iter__()

__next__()

__iter__() : takes iteratable object like list, tuples

__next__(): is used to return the next value in iteration

Use of iterators

Iterators with class

GENERATORS

1. Generator generate one element at a time from a sequence.

2. Yield is used to get the value

3 It saves the state not like function where once function is called state will be returned to new call

USE

List Comprehension vs Generation

Comprehension: all in one go

Generation : one by one ...fast

EXAMPLE

DECORATORS

1. A decorator is a special function which adds some extra functionality to an existing function

2. A decorator is a function that accepts a function as a parameter and returns a function.

3. Decorators are useful to perform some additional processing required by a function.

Want to add addition functionality to function

@decor

showvehicle = decor(showvehicle) instead of this line, you can use @decor

@decor implementation

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