Python Generators and Yielding

README.md

Python Generators and Yielding

In python yield can be used to transfer information in both directions.

yield 'hello'

will generate (vs return) the string "hello", whereas

x = yield

will receive a value from .send() method.

The output of the example blow will be:

$ python yield_example.py
0
1
2
Exiting out of here

yield_example.py

def number_generator():

    x = 0
    while True:
        abort = yield x  # Generate x AND see if anything was sent!
        if abort:
            break
        else:
            x = x + 1

    yield 'Exiting out of here'

ng = number_generator()

print ng.next()
print ng.next()
print ng.next()
print ng.send(True)