Python Generators Example

generator_example.py

#!/usr/bin/python

import time

def f():
        print "f(): Function 'f' has been called"
        print "f(): I can do a bunch of junk here"
        print "f(): Maybe start reading in a file line by line"
        print "f(): Going to sleep for 2 seconds\n"
        time.sleep(2)

        print "f(): About to yield for first time"
        yield 1
        print "f(): Have yielded once already, lets do it again"
        yield 2
        print "f(): Have yielded twice now, one more time"
        yield 3
        print "f(): Have yielded three times now, and that was the last time, not going to return any more data, going to sleep for 5 seconds"
        time.sleep(5)

print "main: Program Started"
print "main: About to start loop"
for val in f():
        print "main: Got value: %i, lets pause for a couple of seconds before continuing the loop\n" % (val)
        time.sleep(2)

print "main: Finished looping, lets end the program"