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# a generator that closes over outer variables
def f():
x = 1 # closed over by g
def g():
yield x
yield x + 1
return g()
for i in f():
print(i)
# a generator that has its variables closed over
def f():
x = 1 # closed over by g
def g():
return x + 1
yield g()
x = 2
yield g()
for i in f():
print(i)
# using comprehensions, the inner generator closes over y
generator_of_generators = (((x, y) for x in range(2)) for y in range(3))
for i in generator_of_generators:
for j in i:
print(j)
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