mirror of
https://github.com/python/cpython.git
synced 2025-10-31 05:31:20 +00:00
64 lines
1.7 KiB
Python
64 lines
1.7 KiB
Python
# 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.detach(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
|