{"id":990109,"date":"2024-12-27T08:17:26","date_gmt":"2024-12-27T00:17:26","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/990109.html"},"modified":"2024-12-27T08:17:29","modified_gmt":"2024-12-27T00:17:29","slug":"python%e5%a6%82%e4%bd%95%e5%ae%9e%e7%8e%b0%e5%81%9c%e6%ad%a2%e7%bb%a7%e7%bb%ad","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/990109.html","title":{"rendered":"python\u5982\u4f55\u5b9e\u73b0\u505c\u6b62\u7ee7\u7eed"},"content":{"rendered":"

\"python\u5982\u4f55\u5b9e\u73b0\u505c\u6b62\u7ee7\u7eed\"<\/p>\n

\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u63a7\u5236\u6d41\u7a0b\u8bed\u53e5\u3001\u5f02\u5e38\u5904\u7406\u548c\u7ebf\u7a0b\u63a7\u5236\u7b49\u65b9\u5f0f\u5b9e\u73b0\u7a0b\u5e8f\u7684\u505c\u6b62\u548c\u7ee7\u7eed\u3002\u5e38\u7528\u7684\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528break<\/code>\u548ccontinue<\/code>\u8bed\u53e5\u63a7\u5236\u5faa\u73af\u3001\u4f7f\u7528try-except<\/code>\u5757\u5904\u7406\u5f02\u5e38\u3001\u4ee5\u53ca\u4f7f\u7528\u7ebf\u7a0b\u548c\u4fe1\u53f7\u6765\u63a7\u5236\u7a0b\u5e8f\u7684\u6267\u884c\u3002<\/strong>\u5728\u8fd9\u4e9b\u65b9\u6cd5\u4e2d\uff0cbreak<\/code>\u548ccontinue<\/code>\u662f\u7528\u4e8e\u5faa\u73af\u63a7\u5236\u7684\u57fa\u672c\u8bed\u53e5\uff0ctry-except<\/code>\u5757\u5219\u7528\u4e8e\u6355\u83b7\u5e76\u5904\u7406\u5f02\u5e38\uff0c\u4ece\u800c\u63a7\u5236\u7a0b\u5e8f\u7684\u6d41\u52a8\u3002\u800c\u7ebf\u7a0b\u548c\u4fe1\u53f7\u53ef\u4ee5\u7528\u4e8e\u66f4\u590d\u6742\u7684\u573a\u666f\uff0c\u6bd4\u5982\u9700\u8981\u5728\u7279\u5b9a\u6761\u4ef6\u4e0b\u6682\u505c\u6216\u6062\u590d\u7a0b\u5e8f\u7684\u6267\u884c\u3002<\/p>\n<\/p>\n

\u4e00\u3001break<\/code>\u548ccontinue<\/code>\u8bed\u53e5\u7684\u4f7f\u7528<\/h3>\n<\/p>\n

1. break<\/code>\u8bed\u53e5<\/strong><\/p>\n<\/p>\n

break<\/code>\u8bed\u53e5\u7528\u4e8e\u9000\u51fa\u6700\u8fd1\u7684\u5faa\u73af\u3002\u5b83\u5e38\u7528\u4e8e\u5728\u6ee1\u8db3\u7279\u5b9a\u6761\u4ef6\u65f6\u4e2d\u65ad\u5faa\u73af\u6267\u884c\u3002\u4f8b\u5982\uff0c\u5728\u904d\u5386\u5217\u8868\u65f6\u627e\u5230\u76ee\u6807\u5143\u7d20\u540e\u53ef\u4ee5\u7acb\u5373\u9000\u51fa\u5faa\u73af\uff1a<\/p>\n<\/p>\n

items = [1, 2, 3, 4, 5]<\/p>\n
for item in items:<\/p>\n
    if item == 3:<\/p>\n
        print("Found item 3, exiting loop.")<\/p>\n
        break<\/p>\n
    print(item)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u5f53\u904d\u5386\u5230\u5143\u7d203<\/code>\u65f6\uff0cbreak<\/code>\u8bed\u53e5\u4f1a\u7ec8\u6b62\u5faa\u73af\uff0c\u56e0\u6b64\u53ea\u4f1a\u8f93\u51fa1<\/code>\u30012<\/code>\u548c"Found item 3, exiting loop."<\/code>\u3002<\/p>\n<\/p>\n
2. continue<\/code>\u8bed\u53e5<\/strong><\/p>\n<\/p>\n
continue<\/code>\u8bed\u53e5\u7528\u4e8e\u8df3\u8fc7\u5f53\u524d\u5faa\u73af\u7684\u5269\u4f59\u4ee3\u7801\uff0c\u5e76\u7acb\u5373\u5f00\u59cb\u4e0b\u4e00\u6b21\u5faa\u73af\u8fed\u4ee3\u3002\u5b83\u901a\u5e38\u7528\u4e8e\u5728\u6ee1\u8db3\u7279\u5b9a\u6761\u4ef6\u65f6\u8df3\u8fc7\u67d0\u4e9b\u5904\u7406\u903b\u8f91\uff1a<\/p>\n<\/p>\n
for i in range(5):<\/p>\n
    if i == 2:<\/p>\n
        continue<\/p>\n
    print(i)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u6b64\u4ee3\u7801\u4f1a\u6253\u5370\u51fa0<\/code>\u30011<\/code>\u30013<\/code>\u548c4<\/code>\uff0c\u56e0\u4e3a\u5f53i<\/code>\u7b49\u4e8e2<\/code>\u65f6\uff0ccontinue<\/code>\u8bed\u53e5\u8df3\u8fc7\u4e86\u5bf92<\/code>\u7684\u6253\u5370\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u5f02\u5e38\u5904\u7406\u673a\u5236<\/h3>\n<\/p>\n
\u5f02\u5e38\u5904\u7406\u673a\u5236\u63d0\u4f9b\u4e86\u4e00\u79cd\u5728\u7a0b\u5e8f\u8fd0\u884c\u65f6\u6355\u83b7\u548c\u5904\u7406\u9519\u8bef\u7684\u65b9\u5f0f\uff0c\u4ece\u800c\u907f\u514d\u7a0b\u5e8f\u5d29\u6e83\u3002\u5728Python\u4e2d\uff0ctry-except<\/code>\u5757\u7528\u4e8e\u6355\u83b7\u5f02\u5e38\uff0c\u5e76\u6839\u636e\u9700\u8981\u91c7\u53d6\u76f8\u5e94\u7684\u63aa\u65bd\u3002<\/p>\n<\/p>\n
1. \u6355\u83b7\u5f02\u5e38<\/strong><\/p>\n<\/p>\n
\u901a\u8fc7\u6355\u83b7\u5f02\u5e38\uff0c\u53ef\u4ee5\u63a7\u5236\u7a0b\u5e8f\u5728\u9047\u5230\u9519\u8bef\u65f6\u7684\u884c\u4e3a\uff0c\u800c\u4e0d\u662f\u76f4\u63a5\u505c\u6b62\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
try:<\/p>\n
    result = 10 \/ 0<\/p>\n
except ZeroDivisionError:<\/p>\n
    print("Cannot divide by zero.")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u9664\u4ee5\u96f6\u4f1a\u5f15\u53d1ZeroDivisionError<\/code>\u3002\u901a\u8fc7try-except<\/code>\u5757\uff0c\u7a0b\u5e8f\u53ef\u4ee5\u6355\u83b7\u8fd9\u4e2a\u5f02\u5e38\uff0c\u5e76\u8f93\u51fa\u9519\u8bef\u4fe1\u606f\uff0c\u800c\u4e0d\u4f1a\u5bfc\u81f4\u7a0b\u5e8f\u5d29\u6e83\u3002<\/p>\n<\/p>\n
2. \u4f7f\u7528finally<\/code>\u5757<\/strong><\/p>\n<\/p>\n
\u6709\u65f6\uff0c\u65e0\u8bba\u662f\u5426\u53d1\u751f\u5f02\u5e38\uff0c\u90fd\u9700\u8981\u6267\u884c\u4e00\u4e9b\u6e05\u7406\u5de5\u4f5c\uff0c\u6bd4\u5982\u5173\u95ed\u6587\u4ef6\u6216\u91ca\u653e\u8d44\u6e90\u3002\u8fd9\u65f6\u53ef\u4ee5\u4f7f\u7528finally<\/code>\u5757\uff1a<\/p>\n<\/p>\n
try:<\/p>\n
    file = open("sample.txt", "r")<\/p>\n
    # \u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9<\/p>\n
finally:<\/p>\n
    file.close()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u65e0\u8bba\u6587\u4ef6\u8bfb\u53d6\u8fc7\u7a0b\u4e2d\u662f\u5426\u51fa\u73b0\u5f02\u5e38\uff0cfinally<\/code>\u5757\u4e2d\u7684file.close()<\/code>\u90fd\u4f1a\u88ab\u6267\u884c\uff0c\u4ee5\u786e\u4fdd\u6587\u4ef6\u88ab\u6b63\u786e\u5173\u95ed\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u7ebf\u7a0b\u548c\u4fe1\u53f7\u63a7\u5236<\/h3>\n<\/p>\n
\u5728\u591a\u7ebf\u7a0b\u7a0b\u5e8f\u4e2d\uff0c\u53ef\u80fd\u9700\u8981\u5728\u7279\u5b9a\u6761\u4ef6\u4e0b\u6682\u505c\u6216\u6062\u590d\u7ebf\u7a0b\u7684\u6267\u884c\u3002\u8fd9\u53ef\u4ee5\u901a\u8fc7\u7ebf\u7a0b\u63a7\u5236\u548c\u4fe1\u53f7\u673a\u5236\u6765\u5b9e\u73b0\u3002<\/p>\n<\/p>\n
1. \u4f7f\u7528\u7ebf\u7a0b\u4e8b\u4ef6<\/strong><\/p>\n<\/p>\n
\u7ebf\u7a0b\u4e8b\u4ef6\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u540c\u6b65\u539f\u8bed\uff0c\u7528\u4e8e\u5b9e\u73b0\u7ebf\u7a0b\u4e4b\u95f4\u7684\u901a\u4fe1\u3002\u53ef\u4ee5\u4f7f\u7528Event<\/code>\u5bf9\u8c61\u6765\u63a7\u5236\u7ebf\u7a0b\u7684\u6682\u505c\u548c\u6062\u590d\uff1a<\/p>\n<\/p>\n
import threading<\/p>\n
import time<\/p>\n
def worker(event):<\/p>\n
    while not event.is_set():<\/p>\n
        print("Working...")<\/p>\n
        time.sleep(1)<\/p>\n
event = threading.Event()<\/p>\n
thread = threading.Thread(target=worker, args=(event,))<\/p>\n
thread.start()<\/p>\n
time.sleep(5)<\/p>\n
print("Stopping worker thread.")<\/p>\n
event.set()  # \u901a\u77e5\u7ebf\u7a0b\u505c\u6b62<\/p>\n
thread.join()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cworker<\/code>\u51fd\u6570\u4f1a\u5728event<\/code>\u88ab\u8bbe\u7f6e\u4e4b\u524d\u6301\u7eed\u6267\u884c\u3002\u4e3b\u7ebf\u7a0b\u57285\u79d2\u540e\u8bbe\u7f6eevent<\/code>\uff0c\u901a\u77e5worker<\/code>\u7ebf\u7a0b\u505c\u6b62\u6267\u884c\u3002<\/p>\n<\/p>\n
2. \u4f7f\u7528\u4fe1\u53f7<\/strong><\/p>\n<\/p>\n
\u5728Unix\u7cfb\u7edf\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4fe1\u53f7\u6765\u63a7\u5236\u8fdb\u7a0b\u7684\u884c\u4e3a\u3002Python\u7684signal<\/code>\u6a21\u5757\u63d0\u4f9b\u4e86\u7528\u4e8e\u6ce8\u518c\u4fe1\u53f7\u5904\u7406\u5668\u7684\u529f\u80fd\uff1a<\/p>\n<\/p>\n
import signal<\/p>\n
import time<\/p>\n
def handler(signum, frame):<\/p>\n
    print("Signal received:", signum)<\/p>\n
signal.signal(signal.SIGINT, handler)<\/p>\n
while True:<\/p>\n
    print("Running...")<\/p>\n
    time.sleep(1)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5f53\u7528\u6237\u6309\u4e0bCtrl+C<\/code>\u65f6\uff0c\u4f1a\u89e6\u53d1SIGINT<\/code>\u4fe1\u53f7\uff0c\u8c03\u7528handler<\/code>\u51fd\u6570\u8fdb\u884c\u5904\u7406\u3002\u5728handler<\/code>\u4e2d\uff0c\u53ef\u4ee5\u5b9e\u73b0\u6682\u505c\u6216\u6062\u590d\u7a0b\u5e8f\u7684\u903b\u8f91\u3002<\/p>\n<\/p>\n
\u56db\u3001\u4f7f\u7528\u5faa\u73af\u4e0e\u6761\u4ef6\u63a7\u5236<\/h3>\n<\/p>\n
\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u901a\u8fc7\u5faa\u73af\u548c\u6761\u4ef6\u8bed\u53e5\u6765\u5b9e\u73b0\u6682\u505c\u548c\u7ee7\u7eed\u7684\u529f\u80fd\u3002\u4f8b\u5982\uff0c\u4f7f\u7528\u4e00\u4e2a\u5faa\u73af\u6765\u76d1\u542c\u7528\u6237\u8f93\u5165\uff0c\u51b3\u5b9a\u7a0b\u5e8f\u7684\u6682\u505c\u6216\u7ee7\u7eed\uff1a<\/p>\n<\/p>\n
while True:<\/p>\n
    command = input("Enter 'pause' to pause, 'continue' to continue, 'exit' to exit: ")<\/p>\n
    if command == 'pause':<\/p>\n
        print("Program paused. Enter 'continue' to resume.")<\/p>\n
        while input() != 'continue':<\/p>\n
            pass<\/p>\n
    elif command == 'exit':<\/p>\n
        break<\/p>\n
    else:<\/p>\n
        print("Running...")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u7528\u6237\u53ef\u4ee5\u901a\u8fc7\u8f93\u5165pause<\/code>\u6765\u6682\u505c\u7a0b\u5e8f\uff0c\u5e76\u901a\u8fc7\u8f93\u5165continue<\/code>\u6765\u6062\u590d\u7a0b\u5e8f\u6267\u884c\uff0c\u8f93\u5165exit<\/code>\u5219\u7ec8\u6b62\u7a0b\u5e8f\u3002<\/p>\n<\/p>\n
\u901a\u8fc7\u5408\u7406\u4f7f\u7528\u8fd9\u4e9b\u63a7\u5236\u7ed3\u6784\u548c\u673a\u5236\uff0c\u53ef\u4ee5\u5728Python\u7a0b\u5e8f\u4e2d\u5b9e\u73b0\u7075\u6d3b\u7684\u505c\u6b62\u548c\u7ee7\u7eed\u529f\u80fd\u3002\u6839\u636e\u5177\u4f53\u7684\u9700\u6c42\uff0c\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u6765\u7ba1\u7406\u7a0b\u5e8f\u7684\u6267\u884c\u6d41\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u5728Python\u4e2d\u5b9e\u73b0\u7a0b\u5e8f\u7684\u6682\u505c\u548c\u6062\u590d\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528time<\/code>\u6a21\u5757\u4e2d\u7684sleep()<\/code>\u51fd\u6570\u6765\u5b9e\u73b0\u7a0b\u5e8f\u7684\u6682\u505c\u3002\u901a\u8fc7\u5728\u9700\u8981\u6682\u505c\u7684\u5730\u65b9\u8c03\u7528sleep()<\/code>\uff0c\u53ef\u4ee5\u8ba9\u7a0b\u5e8f\u5728\u6307\u5b9a\u7684\u65f6\u95f4\u5185\u505c\u6b62\u6267\u884c\u3002\u82e5\u8981\u5b9e\u73b0\u6062\u590d\uff0c\u53ef\u4ee5\u4f7f\u7528\u7ebf\u7a0b\u6216\u5f02\u6b65\u7f16\u7a0b\u6765\u63a7\u5236\u7a0b\u5e8f\u7684\u6d41\u52a8\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u53ef\u4ee5\u5229\u7528threading<\/code>\u6a21\u5757\u521b\u5efa\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u5728\u7ebf\u7a0b\u4e2d\u6267\u884c\u9700\u8981\u6682\u505c\u7684\u4ee3\u7801\uff0c\u540c\u65f6\u901a\u8fc7\u4e8b\u4ef6\u6807\u5fd7\u6765\u63a7\u5236\u6682\u505c\u548c\u6062\u590d\u3002<\/p>\n
Python\u4e2d\u6709\u54ea\u4e9b\u5e93\u53ef\u4ee5\u5e2e\u52a9\u5b9e\u73b0\u4ee3\u7801\u7684\u505c\u6b62\u548c\u7ee7\u7eed\u529f\u80fd\uff1f<\/strong>
\u6709\u51e0\u4e2a\u6d41\u884c\u7684\u5e93\u53ef\u4ee5\u5e2e\u52a9\u5b9e\u73b0\u4ee3\u7801\u7684\u6682\u505c\u548c\u6062\u590d\u529f\u80fd\u3002\u4f8b\u5982\uff0cthreading<\/code>\u5e93\u53ef\u4ee5\u521b\u5efa\u591a\u4e2a\u7ebf\u7a0b\u4ee5\u5b9e\u73b0\u5e76\u884c\u6267\u884c\uff0c\u5e76\u4f7f\u7528\u4e8b\u4ef6\u5bf9\u8c61\u6765\u63a7\u5236\u7ebf\u7a0b\u7684\u6682\u505c\u548c\u6062\u590d\u3002\u6b64\u5916\uff0casyncio<\/code>\u5e93\u53ef\u4ee5\u901a\u8fc7\u534f\u7a0b\u6765\u5b9e\u73b0\u5f02\u6b65\u7684\u6682\u505c\u548c\u7ee7\u7eed\uff0c\u5141\u8bb8\u4f60\u5728\u7b49\u5f85\u67d0\u4e9b\u64cd\u4f5c\u5b8c\u6210\u65f6\u4fdd\u6301\u7a0b\u5e8f\u7684\u54cd\u5e94\u6027\u3002<\/p>\n
\u5982\u4f55\u5728Python\u4e2d\u5904\u7406\u7528\u6237\u8f93\u5165\u4ee5\u5b9e\u73b0\u6682\u505c\u548c\u7ee7\u7eed\uff1f<\/strong>
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