Hi folks,
When I am trying to understand "yield" expression in Python2.6, I did the
following coding. I have difficulty understanding why "val" will be "None" ?
What's happening under the hood? It seems to me very time the counter resumes
to execute, it will assign "count" to "val", so "val" should NOT be "None" all
the time.
Thanks !
code snippet:
----
def counter(start_at=0):
count = start_at
while True:
val = (yield count)
if val is not None:
count = val
else:
print 'val is None'
count += 1
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