Coroutines in Python for Data Engineering (1)

Coroutine — greenlet

from greenlet import greenlet

def test1():
    print("Test1 begins")
    gr2.switch()
    print("Test1 ends")

def test2():
    print("Test2 begins")
    gr1.switch()
    print("Test2 ends")

gr1 = greenlet(test1)
gr2 = greenlet(test2)
gr1.switch()

Greenlet provides a more straightforward way switch() to switch between functions, instead of yield, next and send.

In the code above, we created two greenlet object, gr1 and gr2 . gr1 is actually calling test and gr2 is…