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when generators share their state
This program generates the following table:
01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
It shows what happens when two generators share the same state.
Contrast with:
def each( seq ):
This does exactly what the built-in iter() function does.
iter() is also invoked by the 'for' loop itself, so it's
doubly redundant.
for e in seq: yield e
gen = each('0123456789ABCDEF')
for y in gen:
for x in gen:
print ( y + x ),
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