test_genf

#! /bin/env python
def gen_func1(n):
    for i in range(n):
        callback = lambda : i
        yield callback

def gen_func2(n):
    for i in range(n):
        def genf(i):
            return lambda: i
        callback = genf(i)
        yield callback
        
def test(func):
    l = []
    print func
    for f in func(2):
        print "first loop:",f()
        l.append(f)
    for f in l:
        print "second loop:",f()
        
test(gen_func1)
test(gen_func2)

结果:
<function gen_func1 at 0x10a2b1578>
first loop: 0
first loop: 1
second loop: 1
second loop: 1
<function gen_func2 at 0x10a2b15f0>
first loop: 0
first loop: 1
second loop: 0
second loop: 1