Python Generator

python

What is generator in Python?

• A simple way of creating iterators
• A function with yield statement instead of return statement. It can have mutilple yield statements.
• Iterator methods __iter__() and __next__() are implemented automatically.
• yield statement pauses the function saving all its states and later continues from there on successive calls.
• When called, it returns an object (iterator) but does not start execution immediately.

Benifits

• Easy to implement. No need to warry about methods __iter__() and __next__()
• Memory efficient
• Represent infinite stream
• Pipling generator

Understand more

[x for x in range(5)] ==> list

(x for x in range(5)) ==> generator

tuple(range(5)) ==> tuple

References

https://www.programiz.com/python-programming/generator

https://medium.freecodecamp.org/python-list-comprehensions-vs-generator-expressions-cef70ccb49db

Written on May 10, 2019