{"id":1154882,"date":"2025-01-13T17:56:42","date_gmt":"2025-01-13T09:56:42","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1154882.html"},"modified":"2025-01-13T17:56:44","modified_gmt":"2025-01-13T09:56:44","slug":"%e5%a6%82%e4%bd%95%e8%b7%b3%e5%87%bapython%e7%9a%84%e9%81%8d%e5%8e%86","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1154882.html","title":{"rendered":"\u5982\u4f55\u8df3\u51fapython\u7684\u904d\u5386"},"content":{"rendered":"

\"\u5982\u4f55\u8df3\u51fapython\u7684\u904d\u5386\"<\/p>\n

\u5728Python\u4e2d\uff0c\u8df3\u51fa\u904d\u5386\u64cd\u4f5c\u7684\u65b9\u5f0f\u6709\u591a\u79cd\uff0c\u4f7f\u7528break<\/code>\u8bed\u53e5\u3001\u4f7f\u7528return<\/code>\u8bed\u53e5\u3001\u4f7f\u7528sys.exit()<\/code>\u51fd\u6570<\/strong>\u3002\u5176\u4e2d\u6700\u5e38\u7528\u7684\u662fbreak<\/code>\u8bed\u53e5\u3002break<\/code>\u8bed\u53e5\u53ef\u4ee5\u7acb\u5373\u7ec8\u6b62\u5f53\u524d\u7684\u5faa\u73af\uff0c\u7ee7\u7eed\u6267\u884c\u5faa\u73af\u540e\u7684\u4ee3\u7801<\/strong>\u3002\u4f8b\u5982\uff0c\u5728\u904d\u5386\u5217\u8868\u65f6\uff0c\u5982\u679c\u627e\u5230\u4e00\u4e2a\u7279\u5b9a\u7684\u5143\u7d20\uff0c\u53ef\u4ee5\u4f7f\u7528break<\/code>\u8bed\u53e5\u6765\u8df3\u51fa\u5faa\u73af\u5e76\u505c\u6b62\u8fdb\u4e00\u6b65\u7684\u904d\u5386\u3002\u8fd9\u6837\u53ef\u4ee5\u63d0\u9ad8\u7a0b\u5e8f\u7684\u6548\u7387\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u5faa\u73af\u64cd\u4f5c\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528break<\/code>\u8bed\u53e5<\/h3>\n<\/p>\n

break<\/code>\u8bed\u53e5\u662fPython\u4e2d\u7528\u4e8e\u8df3\u51fa\u5faa\u73af\u7684\u4e00\u79cd\u5e38\u7528\u65b9\u5f0f\u3002\u5b83\u53ef\u4ee5\u7acb\u5373\u7ec8\u6b62\u5f53\u524d\u7684\u5faa\u73af\uff0c\u5e76\u7ee7\u7eed\u6267\u884c\u5faa\u73af\u540e\u7684\u4ee3\u7801\u3002\u5bf9\u4e8e\u5d4c\u5957\u5faa\u73af\uff0cbreak<\/code>\u53ea\u4f1a\u8df3\u51fa\u6700\u5185\u5c42\u7684\u5faa\u73af\u3002<\/p>\n<\/p>\n

\u793a\u4f8b\u4ee3\u7801<\/h4>\n<\/p>\n

fruits = ["apple", "banana", "cherry", "date", "fig"]<\/p>\n
for fruit in fruits:<\/p>\n
    if fruit == "cherry":<\/p>\n
        break<\/p>\n
    print(fruit)<\/p>\n
print("Loop ended.")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u5f53fruit<\/code>\u7684\u503c\u7b49\u4e8e"cherry"\u65f6\uff0cbreak<\/code>\u8bed\u53e5\u5c06\u7ec8\u6b62\u5faa\u73af\uff0c\u6253\u5370"apple"\u548c"banana"\uff0c\u7136\u540e\u8df3\u51fa\u5faa\u73af\u5e76\u6253\u5370"Loop ended."\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528return<\/code>\u8bed\u53e5<\/h3>\n<\/p>\n
\u5728\u51fd\u6570\u5185\u90e8\uff0creturn<\/code>\u8bed\u53e5\u53ef\u4ee5\u7528\u4e8e\u9000\u51fa\u5f53\u524d\u51fd\u6570\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u503c\u3002\u901a\u8fc7\u4f7f\u7528return<\/code>\u8bed\u53e5\uff0c\u53ef\u4ee5\u5728\u904d\u5386\u8fc7\u7a0b\u4e2d\u8df3\u51fa\u5faa\u73af\uff0c\u5e76\u7ec8\u6b62\u51fd\u6570\u7684\u6267\u884c\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\u4ee3\u7801<\/h4>\n<\/p>\n
def find_fruit(fruits, target):<\/p>\n
    for fruit in fruits:<\/p>\n
        if fruit == target:<\/p>\n
            return f"{target} found!"<\/p>\n
    return f"{target} not found."<\/p>\n
fruits = ["apple", "banana", "cherry", "date", "fig"]<\/p>\n
result = find_fruit(fruits, "cherry")<\/p>\n
print(result)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0cfind_fruit<\/code>\u51fd\u6570\u904d\u5386fruits<\/code>\u5217\u8868\uff0c\u5e76\u5728\u627e\u5230\u76ee\u6807\u5143\u7d20\u65f6\u4f7f\u7528return<\/code>\u8bed\u53e5\u7ec8\u6b62\u51fd\u6570\u7684\u6267\u884c\uff0c\u5e76\u8fd4\u56de\u7ed3\u679c\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528sys.exit()<\/code>\u51fd\u6570<\/h3>\n<\/p>\n
sys.exit()<\/code>\u51fd\u6570\u53ef\u4ee5\u7528\u4e8e\u7acb\u5373\u7ec8\u6b62\u7a0b\u5e8f\u7684\u6267\u884c\u3002\u867d\u7136\u8fd9\u5e76\u4e0d\u662f\u5e38\u7528\u7684\u8df3\u51fa\u5faa\u73af\u7684\u65b9\u6cd5\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u4f8b\u5982\u9047\u5230\u81f4\u547d\u9519\u8bef\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528sys.exit()<\/code>\u6765\u7ec8\u6b62\u7a0b\u5e8f\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\u4ee3\u7801<\/h4>\n<\/p>\n
import sys<\/p>\n
fruits = ["apple", "banana", "cherry", "date", "fig"]<\/p>\n
for fruit in fruits:<\/p>\n
    if fruit == "cherry":<\/p>\n
        sys.exit("Exiting program due to cherry.")<\/p>\n
    print(fruit)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u5f53fruit<\/code>\u7684\u503c\u7b49\u4e8e"cherry"\u65f6\uff0csys.exit()<\/code>\u51fd\u6570\u5c06\u7ec8\u6b62\u7a0b\u5e8f\u7684\u6267\u884c\uff0c\u5e76\u8f93\u51fa\u9519\u8bef\u6d88\u606f\u3002<\/p>\n<\/p>\n
\u56db\u3001\u4f7f\u7528\u6807\u5fd7\u53d8\u91cf<\/h3>\n<\/p>\n
\u5728\u67d0\u4e9b\u590d\u6742\u7684\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u4f7f\u7528\u6807\u5fd7\u53d8\u91cf\u6765\u63a7\u5236\u5faa\u73af\u7684\u9000\u51fa\u3002\u901a\u8fc7\u5728\u5faa\u73af\u4e2d\u8bbe\u7f6e\u6807\u5fd7\u53d8\u91cf\uff0c\u5e76\u5728\u5faa\u73af\u5916\u90e8\u68c0\u67e5\u6807\u5fd7\u53d8\u91cf\u7684\u72b6\u6001\uff0c\u53ef\u4ee5\u7075\u6d3b\u5730\u63a7\u5236\u5faa\u73af\u7684\u9000\u51fa\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\u4ee3\u7801<\/h4>\n<\/p>\n
fruits = ["apple", "banana", "cherry", "date", "fig"]<\/p>\n
found = False<\/p>\n
for fruit in fruits:<\/p>\n
    if fruit == "cherry":<\/p>\n
        found = True<\/p>\n
        break<\/p>\n
    print(fruit)<\/p>\n
if found:<\/p>\n
    print("Cherry was found and loop was exited.")<\/p>\n
else:<\/p>\n
    print("Cherry was not found.")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u4f7f\u7528\u6807\u5fd7\u53d8\u91cffound<\/code>\u6765\u63a7\u5236\u5faa\u73af\u7684\u9000\u51fa\u548c\u540e\u7eed\u7684\u64cd\u4f5c\u903b\u8f91\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u4f7f\u7528\u5f02\u5e38\u5904\u7406<\/h3>\n<\/p>\n
\u5728\u67d0\u4e9b\u7279\u6b8a\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u901a\u8fc7\u5f15\u53d1\u548c\u6355\u83b7\u5f02\u5e38\u6765\u9000\u51fa\u5faa\u73af\u3002\u867d\u7136\u8fd9\u4e0d\u662f\u5e38\u7528\u7684\u65b9\u6cd5\uff0c\u4f46\u5728\u9700\u8981\u5904\u7406\u5f02\u5e38\u60c5\u51b5\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u8fd9\u79cd\u65b9\u5f0f\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\u4ee3\u7801<\/h4>\n<\/p>\n
fruits = ["apple", "banana", "cherry", "date", "fig"]<\/p>\n
class ExitLoopException(Exception):<\/p>\n
    pass<\/p>\n
try:<\/p>\n
    for fruit in fruits:<\/p>\n
        if fruit == "cherry":<\/p>\n
            rAI<\/a>se ExitLoopException("Cherry found, exiting loop.")<\/p>\n
        print(fruit)<\/p>\n
except ExitLoopException as e:<\/p>\n
    print(e)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u5b9a\u4e49\u4e86\u4e00\u4e2a\u81ea\u5b9a\u4e49\u5f02\u5e38ExitLoopException<\/code>\uff0c\u5e76\u5728\u904d\u5386\u8fc7\u7a0b\u4e2d\u5f15\u53d1\u5f02\u5e38\u6765\u9000\u51fa\u5faa\u73af\u3002\u5728\u6355\u83b7\u5f02\u5e38\u540e\uff0c\u6253\u5370\u5f02\u5e38\u6d88\u606f\u3002<\/p>\n<\/p>\n
\u516d\u3001\u4f7f\u7528itertools.dropwhile<\/code>\u51fd\u6570<\/h3>\n<\/p>\n
itertools.dropwhile<\/code>\u51fd\u6570\u53ef\u4ee5\u7528\u4e8e\u8df3\u8fc7\u6ee1\u8db3\u6761\u4ef6\u7684\u5143\u7d20\uff0c\u76f4\u5230\u6761\u4ef6\u4e0d\u518d\u6ee1\u8db3\u3002\u867d\u7136\u8fd9\u4e0d\u662f\u76f4\u63a5\u8df3\u51fa\u5faa\u73af\u7684\u65b9\u6cd5\uff0c\u4f46\u53ef\u4ee5\u7528\u4e8e\u8df3\u8fc7\u90e8\u5206\u5143\u7d20\uff0c\u5e76\u7ee7\u7eed\u904d\u5386\u5269\u4f59\u5143\u7d20\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\u4ee3\u7801<\/h4>\n<\/p>\n
from itertools import dropwhile<\/p>\n
fruits = ["apple", "banana", "cherry", "date", "fig"]<\/p>\n
for fruit in dropwhile(lambda x: x != "cherry", fruits):<\/p>\n
    print(fruit)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0cdropwhile<\/code>\u51fd\u6570\u8df3\u8fc7\u4e86"apple"\u548c"banana"\uff0c\u5e76\u4ece"cherry"\u5f00\u59cb\u7ee7\u7eed\u904d\u5386\u5269\u4f59\u7684\u5143\u7d20\u3002<\/p>\n<\/p>\n
\u4e03\u3001\u4f7f\u7528\u751f\u6210\u5668<\/h3>\n<\/p>\n
\u751f\u6210\u5668\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u8fed\u4ee3\u5668\uff0c\u901a\u8fc7yield<\/code>\u5173\u952e\u5b57\u751f\u6210\u503c\u3002\u5728\u904d\u5386\u8fc7\u7a0b\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u63a7\u5236\u751f\u6210\u5668\u7684\u751f\u6210\u903b\u8f91\u6765\u8df3\u51fa\u904d\u5386\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\u4ee3\u7801<\/h4>\n<\/p>\n
def fruit_generator(fruits):<\/p>\n
    for fruit in fruits:<\/p>\n
        if fruit == "cherry":<\/p>\n
            return<\/p>\n
        yield fruit<\/p>\n
fruits = ["apple", "banana", "cherry", "date", "fig"]<\/p>\n
for fruit in fruit_generator(fruits):<\/p>\n
    print(fruit)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0cfruit_generator<\/code>\u751f\u6210\u5668\u5728\u9047\u5230"cherry"\u65f6\u7ec8\u6b62\u751f\u6210\uff0c\u8df3\u51fa\u904d\u5386\u3002<\/p>\n<\/p>\n
\u516b\u3001\u4f7f\u7528while<\/code>\u5faa\u73af\u548c\u6761\u4ef6\u63a7\u5236<\/h3>\n<\/p>\n
\u901a\u8fc7while<\/code>\u5faa\u73af\u548c\u6761\u4ef6\u63a7\u5236\uff0c\u53ef\u4ee5\u7075\u6d3b\u5730\u63a7\u5236\u904d\u5386\u7684\u9000\u51fa\u6761\u4ef6\u3002\u5728\u904d\u5386\u8fc7\u7a0b\u4e2d\uff0c\u53ef\u4ee5\u6839\u636e\u6761\u4ef6\u8bbe\u7f6e\u9000\u51fa\u6807\u5fd7\uff0c\u8df3\u51fa\u5faa\u73af\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\u4ee3\u7801<\/h4>\n<\/p>\n
fruits = ["apple", "banana", "cherry", "date", "fig"]<\/p>\n
index = 0<\/p>\n
while index < len(fruits):<\/p>\n
    fruit = fruits[index]<\/p>\n
    if fruit == "cherry":<\/p>\n
        break<\/p>\n
    print(fruit)<\/p>\n
    index += 1<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u4f7f\u7528while<\/code>\u5faa\u73af\u548c\u7d22\u5f15\u6765\u904d\u5386\u5217\u8868\uff0c\u5e76\u5728\u9047\u5230"cherry"\u65f6\u8df3\u51fa\u5faa\u73af\u3002<\/p>\n<\/p>\n
\u4e5d\u3001\u4f7f\u7528next<\/code>\u51fd\u6570\u548c\u8fed\u4ee3\u5668<\/h3>\n<\/p>\n
\u901a\u8fc7\u4f7f\u7528next<\/code>\u51fd\u6570\u548c\u8fed\u4ee3\u5668\uff0c\u53ef\u4ee5\u63a7\u5236\u904d\u5386\u7684\u9000\u51fa\u3002next<\/code>\u51fd\u6570\u53ef\u4ee5\u7528\u4e8e\u83b7\u53d6\u8fed\u4ee3\u5668\u7684\u4e0b\u4e00\u4e2a\u5143\u7d20\uff0c\u5e76\u5728\u6ee1\u8db3\u6761\u4ef6\u65f6\u9000\u51fa\u904d\u5386\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\u4ee3\u7801<\/h4>\n<\/p>\n
fruits = ["apple", "banana", "cherry", "date", "fig"]<\/p>\n
fruit_iter = iter(fruits)<\/p>\n
while True:<\/p>\n
    fruit = next(fruit_iter, None)<\/p>\n
    if fruit is None or fruit == "cherry":<\/p>\n
        break<\/p>\n
    print(fruit)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u4f7f\u7528next<\/code>\u51fd\u6570\u83b7\u53d6\u8fed\u4ee3\u5668\u7684\u4e0b\u4e00\u4e2a\u5143\u7d20\uff0c\u5e76\u5728\u9047\u5230"cherry"\u65f6\u8df3\u51fa\u5faa\u73af\u3002<\/p>\n<\/p>\n
\u5341\u3001\u4f7f\u7528for-else<\/code>\u7ed3\u6784<\/h3>\n<\/p>\n
\u5728for<\/code>\u5faa\u73af\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528else<\/code>\u7ed3\u6784\u6765\u5904\u7406\u5faa\u73af\u6b63\u5e38\u7ed3\u675f\u7684\u60c5\u51b5\u3002\u5982\u679c\u5faa\u73af\u88abbreak<\/code>\u8bed\u53e5\u4e2d\u65ad\uff0celse<\/code>\u90e8\u5206\u7684\u4ee3\u7801\u5c06\u4e0d\u4f1a\u6267\u884c\u3002<\/p>\n<\/p>\n
\u793a\u4f8b\u4ee3\u7801<\/h4>\n<\/p>\n
fruits = ["apple", "banana", "cherry", "date", "fig"]<\/p>\n
for fruit in fruits:<\/p>\n
    if fruit == "cherry":<\/p>\n
        break<\/p>\n
    print(fruit)<\/p>\n
else:<\/p>\n
    print("Cherry not found in the list.")<\/p>\n
print("Loop ended.")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u5982\u679c\u672a\u627e\u5230"cherry"\uff0celse<\/code>\u90e8\u5206\u7684\u4ee3\u7801\u5c06\u6267\u884c\uff1b\u5982\u679c\u627e\u5230"cherry"\u5e76\u8df3\u51fa\u5faa\u73af\uff0celse<\/code>\u90e8\u5206\u7684\u4ee3\u7801\u5c06\u4e0d\u4f1a\u6267\u884c\u3002<\/p>\n<\/p>\n
\u603b\u7ed3<\/h3>\n<\/p>\n
\u901a\u8fc7\u4e0a\u8ff0\u65b9\u6cd5\uff0cPython\u7a0b\u5e8f\u5458\u53ef\u4ee5\u5728\u4e0d\u540c\u7684\u573a\u666f\u4e0b\u7075\u6d3b\u5730\u63a7\u5236\u904d\u5386\u7684\u9000\u51fa\u3002\u65e0\u8bba\u662f\u4f7f\u7528break<\/code>\u8bed\u53e5\u3001return<\/code>\u8bed\u53e5\uff0c\u8fd8\u662f\u4f7f\u7528\u6807\u5fd7\u53d8\u91cf\u548c\u5f02\u5e38\u5904\u7406\uff0c\u6bcf\u79cd\u65b9\u6cd5\u90fd\u6709\u5176\u9002\u7528\u7684\u60c5\u51b5\u548c\u4f18\u52bf\u3002\u7406\u89e3\u5e76\u638c\u63e1\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5e2e\u52a9\u7f16\u5199\u51fa\u66f4\u52a0\u9ad8\u6548\u548c\u7075\u6d3b\u7684\u4ee3\u7801\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
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