import greenlet
def f1():
print(11)
gr2.switch()
print(22)
gr2.switch()
def f2():
print(33)
gr1.switch()
print(44)
# 协程 gr1
gr1 = greenlet.greenlet(f1)
# 协程 gr2
gr2 = greenlet.greenlet(f2)
gr1.switch()
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