晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //lib64/python2.7/Demo/threads/fcmp.py
# Coroutine example:  controlling multiple instances of a single function

from Coroutine import *

# fringe visits a nested list in inorder, and detaches for each non-list
# element; raises EarlyExit after the list is exhausted
def fringe(co, list):
    for x in list:
        if type(x) is type([]):
            fringe(co, x)
        else:
            co.back(x)

def printinorder(list):
    co = Coroutine()
    f = co.create(fringe, co, list)
    try:
        while 1:
            print co.tran(f),
    except EarlyExit:
        pass
    print

printinorder([1,2,3])  # 1 2 3
printinorder([[[[1,[2]]],3]]) # ditto
x = [0, 1, [2, [3]], [4,5], [[[6]]] ]
printinorder(x) # 0 1 2 3 4 5 6

# fcmp lexicographically compares the fringes of two nested lists
def fcmp(l1, l2):
    co1 = Coroutine(); f1 = co1.create(fringe, co1, l1)
    co2 = Coroutine(); f2 = co2.create(fringe, co2, l2)
    while 1:
        try:
            v1 = co1.tran(f1)
        except EarlyExit:
            try:
                v2 = co2.tran(f2)
            except EarlyExit:
                return 0
            co2.kill()
            return -1
        try:
            v2 = co2.tran(f2)
        except EarlyExit:
            co1.kill()
            return 1
        if v1 != v2:
            co1.kill(); co2.kill()
            return cmp(v1,v2)

print fcmp(range(7), x)  #  0; fringes are equal
print fcmp(range(6), x)  # -1; 1st list ends early
print fcmp(x, range(6))  #  1; 2nd list ends early
print fcmp(range(8), x)  #  1; 2nd list ends early
print fcmp(x, range(8))  # -1; 1st list ends early
print fcmp([1,[[2],8]],
           [[[1],2],8])  #  0
print fcmp([1,[[3],8]],
           [[[1],2],8])  #  1
print fcmp([1,[[2],8]],
           [[[1],2],9])  # -1

# end of example

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