在Python中模擬一個并發(fā)循環(huán)？我需要模擬Python程序中的并發(fā)循環(huán)。不幸的是，以下簡單的代碼不起作用：list_of_ints = [ 1, 2, 3 ]iterator = list_of_ints.__iter__()element = Nonewhile True:
if element:
print element try:
element = iterator.next()
except StopIteration:
breakprint "done"它沒有打印“1，2，3，Done”，而是打印以下輸出：[stdout:]1[stdout:]2[stdout:]3None['Traceback (most recent call last):
', ' File "test_python.py", line 8, in <module>
s = i.next()
', 'StopIteration
']為了捕獲‘停止迭代’異常并正確地中斷一個while循環(huán)，我能做什么？下面以偽碼的形式顯示了為什么需要這樣的東西的例子。狀態(tài)機(jī)：s = ""while True :
if state is STATE_CODE :
if "//" in s :
tokens.add( TOKEN_COMMENT, s.split( "//" )[1] )
state = STATE_COMMENT else :
tokens.add( TOKEN_CODE, s )
if state is STATE_COMMENT :
if "//" in s :
tokens.append( TOKEN_COMMENT, s.split( "//" )[1] )
else
state = STATE_CODE # Re-evaluate same line
continue
try :
s = i.next()
except StopIteration :
break
5 回答
慕尼黑8549860
TA貢獻(xiàn)1818條經(jīng)驗(yàn) 獲得超11個贊
while True: stuff() if fail_condition: break
stuff()while not fail_condition: stuff()
for i in l: print iprint "done"
for s in l: while True: stuff() # use a "break" instead of s = i.next()
for s in some_list: while True: if state is STATE_CODE: if "//" in s: tokens.add( TOKEN_COMMENT, s.split( "//" )[1] ) state = STATE_COMMENT else : tokens.add( TOKEN_CODE, s ) if state is STATE_COMMENT: if "//" in s: tokens.append( TOKEN_COMMENT, s.split( "//" )[1] ) break # get next s else: state = STATE_CODE # re-evaluate same line # continues automatically
精慕HU
TA貢獻(xiàn)1845條經(jīng)驗(yàn) 獲得超8個贊
condition = Truewhile condition: # loop body here condition = test_loop_condition()# end of loop
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