{"id":925481,"date":"2024-12-26T15:31:40","date_gmt":"2024-12-26T07:31:40","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/925481.html"},"modified":"2024-12-26T15:31:43","modified_gmt":"2024-12-26T07:31:43","slug":"python%e5%a6%82%e4%bd%95%e8%bf%ad%e4%bb%a3","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/925481.html","title":{"rendered":"python\u5982\u4f55\u8fed\u4ee3"},"content":{"rendered":"

\"python\u5982\u4f55\u8fed\u4ee3\"<\/p>\n

Python\u4e2d\u7684\u8fed\u4ee3\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u5b9e\u73b0\uff0c\u5305\u62ec\u4f7f\u7528for\u5faa\u73af\u3001while\u5faa\u73af\u548c\u751f\u6210\u5668\u7b49\u3002\u5bf9\u4e8e\u5927\u591a\u6570\u573a\u666f\uff0cfor\u5faa\u73af\u662f\u6700\u5e38\u7528\u7684\u65b9\u6cd5\uff0c\u56e0\u4e3a\u5b83\u7b80\u5355\u4e14\u6613\u4e8e\u7406\u89e3\u3002\u751f\u6210\u5668\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u8fed\u4ee3\u5668\uff0c\u5b83\u4f7f\u7528yield\u5173\u952e\u5b57\u751f\u6210\u5143\u7d20\uff0c\u9002\u7528\u4e8e\u9700\u8981\u60f0\u6027\u8ba1\u7b97\u7684\u573a\u666f\u3002<\/strong>\u5728Python\u4e2d\uff0c\u8fed\u4ee3\u7684\u6838\u5fc3\u662f\u53ef\u8fed\u4ee3\u5bf9\u8c61\u548c\u8fed\u4ee3\u5668\u534f\u8bae\uff0c\u6240\u6709\u53ef\u8fed\u4ee3\u5bf9\u8c61\u90fd\u5b9e\u73b0\u4e86__iter__\u65b9\u6cd5\uff0c\u8fd9\u4f7f\u5f97\u5b83\u4eec\u53ef\u4ee5\u5728for\u5faa\u73af\u4e2d\u88ab\u904d\u5386\u3002\u751f\u6210\u5668\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u8fed\u4ee3\u5668\uff0c\u5b83\u5728\u9700\u8981\u65f6\u8ba1\u7b97\u6bcf\u4e2a\u503c\uff0c\u800c\u4e0d\u662f\u4e00\u6b21\u6027\u751f\u6210\u6240\u6709\u503c\uff0c\u56e0\u6b64\u975e\u5e38\u9002\u5408\u5904\u7406\u5927\u6570\u636e\u96c6\u3002<\/p>\n<\/p>\n

\u4e00\u3001FOR\u5faa\u73af<\/h3>\n<\/p>\n

\u5728Python\u4e2d\uff0cfor\u5faa\u73af\u662f\u4e00\u79cd\u904d\u5386\u53ef\u8fed\u4ee3\u5bf9\u8c61\u7684\u4fbf\u6377\u65b9\u5f0f\u3002\u53ef\u8fed\u4ee3\u5bf9\u8c61\u53ef\u4ee5\u662f\u5217\u8868\u3001\u5143\u7ec4\u3001\u96c6\u5408\u3001\u5b57\u5178\u751a\u81f3\u662f\u5b57\u7b26\u4e32\u3002\u5728\u4f7f\u7528for\u5faa\u73af\u65f6\uff0cPython\u4f1a\u81ea\u52a8\u8c03\u7528\u5bf9\u8c61\u7684__iter__\u65b9\u6cd5\uff0c\u8fd4\u56de\u4e00\u4e2a\u8fed\u4ee3\u5668\uff0c\u5e76\u4f7f\u7528\u8fed\u4ee3\u5668\u7684__next__\u65b9\u6cd5\u83b7\u53d6\u4e0b\u4e00\u4e2a\u5143\u7d20\uff0c\u76f4\u5230\u5f15\u53d1StopIteration\u5f02\u5e38\u3002<\/p>\n<\/p>\n

1. \u5217\u8868\u7684\u904d\u5386<\/h4>\n<\/p>\n

fruits = ["apple", "banana", "cherry"]<\/p>\n
for fruit in fruits:<\/p>\n
    print(fruit)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u4e2a\u4f8b\u5b50\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528for\u5faa\u73af\u904d\u5386\u4e00\u4e2a\u5217\u8868\uff0c\u5e76\u6253\u5370\u6bcf\u4e2a\u5143\u7d20\u3002Python\u4f1a\u81ea\u52a8\u5904\u7406\u8fed\u4ee3\u5668\u7684\u521b\u5efa\u548c\u5143\u7d20\u7684\u63d0\u53d6\u3002<\/p>\n<\/p>\n
2. \u5b57\u5178\u7684\u904d\u5386<\/h4>\n<\/p>\n
\u5b57\u5178\u662f\u4e00\u79cd\u952e\u503c\u5bf9\u7684\u96c6\u5408\uff0c\u904d\u5386\u5b57\u5178\u65f6\u53ef\u4ee5\u9009\u62e9\u904d\u5386\u952e\u3001\u503c\u6216\u952e\u503c\u5bf9\u3002<\/p>\n<\/p>\n
person = {"name": "Alice", "age": 30, "city": "New York"}<\/p>\n
for key in person:<\/p>\n
    print(key, person[key])<\/p>\n
\u6216\u8005<\/strong><\/h2>\n
for key, value in person.items():<\/p>\n
    print(key, value)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u5b57\u5178\u7684items()\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u952e\u503c\u5bf9\u7684\u89c6\u56fe\u5bf9\u8c61\uff0c\u4f7f\u5f97\u53ef\u4ee5\u5728for\u5faa\u73af\u4e2d\u540c\u65f6\u83b7\u53d6\u952e\u548c\u503c\u3002<\/p>\n<\/p>\n
\u4e8c\u3001WHILE\u5faa\u73af<\/h3>\n<\/p>\n
while\u5faa\u73af\u5728Python\u4e2d\u7528\u4e8e\u5728\u6ee1\u8db3\u7279\u5b9a\u6761\u4ef6\u65f6\u91cd\u590d\u6267\u884c\u4e00\u6bb5\u4ee3\u7801\uff0c\u901a\u5e38\u7528\u4e8e\u9700\u8981\u5728\u5faa\u73af\u4e2d\u5bf9\u8fed\u4ee3\u6761\u4ef6\u8fdb\u884c\u66f4\u590d\u6742\u63a7\u5236\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n
1. \u4f7f\u7528\u6761\u4ef6\u63a7\u5236\u8fed\u4ee3<\/h4>\n<\/p>\n
count = 0<\/p>\n
while count < 5:<\/p>\n
    print("Count is:", count)<\/p>\n
    count += 1<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cwhile\u5faa\u73af\u4f1a\u6301\u7eed\u6267\u884c\uff0c\u76f4\u5230count\u4e0d\u518d\u5c0f\u4e8e5\u3002\u5728\u6bcf\u6b21\u8fed\u4ee3\u4e2d\uff0ccount\u7684\u503c\u589e\u52a01\u3002<\/p>\n<\/p>\n
2. \u7528\u4e8e\u8fed\u4ee3\u5217\u8868<\/h4>\n<\/p>\n
\u867d\u7136for\u5faa\u73af\u66f4\u9002\u5408\u904d\u5386\u5217\u8868\uff0c\u4f46while\u5faa\u73af\u4e5f\u53ef\u4ee5\u901a\u8fc7\u7d22\u5f15\u6765\u5b9e\u73b0\u76f8\u540c\u7684\u6548\u679c\u3002<\/p>\n<\/p>\n
fruits = ["apple", "banana", "cherry"]<\/p>\n
index = 0<\/p>\n
while index < len(fruits):<\/p>\n
    print(fruits[index])<\/p>\n
    index += 1<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u91cc\uff0cwhile\u5faa\u73af\u4f7f\u7528\u4e00\u4e2a\u7d22\u5f15\u53d8\u91cf\u6765\u904d\u5386\u5217\u8868\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u751f\u6210\u5668<\/h3>\n<\/p>\n
\u751f\u6210\u5668\u662fPython\u4e2d\u4e00\u79cd\u5f3a\u5927\u7684\u8fed\u4ee3\u5668\u7c7b\u578b\uff0c\u5b83\u4eec\u901a\u8fc7\u5b9a\u4e49\u4e00\u4e2a\u5305\u542byield\u5173\u952e\u5b57\u7684\u51fd\u6570\u6765\u5b9e\u73b0\u3002\u4e0e\u666e\u901a\u51fd\u6570\u4e0d\u540c\uff0c\u751f\u6210\u5668\u51fd\u6570\u5728\u8c03\u7528\u65f6\u4e0d\u4f1a\u7acb\u5373\u6267\u884c\u4ee3\u7801\uff0c\u800c\u662f\u8fd4\u56de\u4e00\u4e2a\u751f\u6210\u5668\u5bf9\u8c61\uff0c\u4ee3\u7801\u5728\u751f\u6210\u5668\u88ab\u8fed\u4ee3\u65f6\u6267\u884c\u3002<\/p>\n<\/p>\n
1. \u57fa\u672c\u751f\u6210\u5668\u793a\u4f8b<\/h4>\n<\/p>\n
def count_up_to(max):<\/p>\n
    count = 1<\/p>\n
    while count <= max:<\/p>\n
        yield count<\/p>\n
        count += 1<\/p>\n
counter = count_up_to(5)<\/p>\n
for num in counter:<\/p>\n
    print(num)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0ccount_up_to\u51fd\u6570\u662f\u4e00\u4e2a\u751f\u6210\u5668\uff0c\u5b83\u6bcf\u6b21\u88ab\u8c03\u7528\u65f6\u4f1a\u201c\u6682\u505c\u201d\u5728yield\u8bed\u53e5\uff0c\u8fd4\u56de\u5f53\u524d\u7684count\u503c\uff0c\u5e76\u5728\u4e0b\u4e00\u6b21\u8fed\u4ee3\u65f6\u4eceyield\u8bed\u53e5\u4e4b\u540e\u7ee7\u7eed\u6267\u884c\u3002<\/p>\n<\/p>\n
2. \u60f0\u6027\u8ba1\u7b97\u7684\u4f18\u52bf<\/h4>\n<\/p>\n
\u751f\u6210\u5668\u7684\u4e00\u4e2a\u4e3b\u8981\u4f18\u52bf\u662f\u5b83\u4eec\u80fd\u591f\u5728\u9700\u8981\u65f6\u751f\u6210\u503c\uff0c\u800c\u4e0d\u662f\u4e00\u6b21\u6027\u5c06\u6240\u6709\u503c\u5b58\u50a8\u5728\u5185\u5b58\u4e2d\u3002\u8fd9\u4f7f\u5f97\u751f\u6210\u5668\u7279\u522b\u9002\u5408\u5904\u7406\u5927\u578b\u6570\u636e\u96c6\u6216\u65e0\u9650\u5e8f\u5217\u3002<\/p>\n<\/p>\n
def fibonacci():<\/p>\n
    a, b = 0, 1<\/p>\n
    while True:<\/p>\n
        yield a<\/p>\n
        a, b = b, a + b<\/p>\n
fib = fibonacci()<\/p>\n
for _ in range(10):<\/p>\n
    print(next(fib))<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cfibonacci\u51fd\u6570\u751f\u6210\u4e86\u4e00\u4e2a\u65e0\u9650\u7684\u6590\u6ce2\u90a3\u5951\u6570\u5217\u3002\u751f\u6210\u5668\u63d0\u4f9b\u4e86\u4e00\u79cd\u9ad8\u6548\u7684\u65b9\u6cd5\u6765\u5904\u7406\u65e0\u9650\u5e8f\u5217\uff0c\u56e0\u4e3a\u5b83\u4eec\u53ea\u5728\u9700\u8981\u65f6\u751f\u6210\u4e0b\u4e00\u4e2a\u503c\u3002<\/p>\n<\/p>\n
\u56db\u3001\u8fed\u4ee3\u5668\u534f\u8bae<\/h3>\n<\/p>\n
\u5728Python\u4e2d\uff0c\u8fed\u4ee3\u5668\u534f\u8bae\u662f\u5b9e\u73b0\u8fed\u4ee3\u529f\u80fd\u7684\u57fa\u7840\u3002\u8fed\u4ee3\u5668\u534f\u8bae\u7531\u4e24\u4e2a\u65b9\u6cd5\u7ec4\u6210\uff1aiter<\/strong>()\u548c__next__()\u3002\u6240\u6709\u7684\u8fed\u4ee3\u5668\u5fc5\u987b\u5b9e\u73b0\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
1. \u81ea\u5b9a\u4e49\u8fed\u4ee3\u5668<\/h4>\n<\/p>\n
\u53ef\u4ee5\u901a\u8fc7\u5b9a\u4e49\u4e00\u4e2a\u7c7b\u6765\u521b\u5efa\u81ea\u5b9a\u4e49\u8fed\u4ee3\u5668\uff0c\u8fd9\u4e2a\u7c7b\u9700\u8981\u5b9e\u73b0__iter__\u548c__next__\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
class MyRange:<\/p>\n
    def __init__(self, start, end):<\/p>\n
        self.current = start<\/p>\n
        self.end = end<\/p>\n
    def __iter__(self):<\/p>\n
        return self<\/p>\n
    def __next__(self):<\/p>\n
        if self.current >= self.end:<\/p>\n
            rAI<\/a>se StopIteration<\/p>\n
        else:<\/p>\n
            self.current += 1<\/p>\n
            return self.current - 1<\/p>\n
my_range = MyRange(1, 5)<\/p>\n
for num in my_range:<\/p>\n
    print(num)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cMyRange\u7c7b\u5b9e\u73b0\u4e86\u4e00\u4e2a\u7b80\u5355\u7684\u8fed\u4ee3\u5668\uff0c\u6a21\u62df\u4e86\u5185\u7f6e\u7684range\u51fd\u6570\u7684\u884c\u4e3a\u3002<\/p>\n<\/p>\n
2. \u8fed\u4ee3\u5668\u7684\u4f18\u52bf<\/h4>\n<\/p>\n
\u8fed\u4ee3\u5668\u63d0\u4f9b\u4e86\u4e00\u79cd\u7edf\u4e00\u7684\u63a5\u53e3\u6765\u8bbf\u95ee\u96c6\u5408\u7684\u5143\u7d20\uff0c\u800c\u4e0d\u9700\u8981\u5173\u5fc3\u96c6\u5408\u7684\u5e95\u5c42\u5b9e\u73b0\u3002\u8fd9\u4f7f\u5f97\u4ee3\u7801\u66f4\u5177\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\uff0c\u56e0\u4e3a\u53ef\u4ee5\u7528\u76f8\u540c\u7684\u65b9\u5f0f\u904d\u5386\u4e0d\u540c\u7c7b\u578b\u7684\u96c6\u5408\u3002\u901a\u8fc7\u4f7f\u7528\u8fed\u4ee3\u5668\u534f\u8bae\uff0c\u53ef\u4ee5\u8f7b\u677e\u521b\u5efa\u652f\u6301\u81ea\u5b9a\u4e49\u884c\u4e3a\u7684\u8fed\u4ee3\u5668\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u8fed\u4ee3\u5668\u4e0e\u53ef\u8fed\u4ee3\u5bf9\u8c61\u7684\u533a\u522b<\/h3>\n<\/p>\n
\u5728Python\u4e2d\uff0c\u7406\u89e3\u8fed\u4ee3\u5668\u548c\u53ef\u8fed\u4ee3\u5bf9\u8c61\u4e4b\u95f4\u7684\u533a\u522b\u662f\u5f88\u91cd\u8981\u7684\u3002\u53ef\u8fed\u4ee3\u5bf9\u8c61\u662f\u5b9e\u73b0\u4e86__iter__\u65b9\u6cd5\u7684\u5bf9\u8c61\uff0c\u800c\u8fed\u4ee3\u5668\u662f\u5b9e\u73b0\u4e86__next__\u65b9\u6cd5\u7684\u5bf9\u8c61\u3002<\/p>\n<\/p>\n
1. \u53ef\u8fed\u4ee3\u5bf9\u8c61<\/h4>\n<\/p>\n
\u53ef\u8fed\u4ee3\u5bf9\u8c61\u662f\u4efb\u4f55\u53ef\u4ee5\u8fd4\u56de\u4e00\u4e2a\u8fed\u4ee3\u5668\u7684\u5bf9\u8c61\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u5b9e\u73b0\u4e86__iter__\u65b9\u6cd5\u3002\u5e38\u89c1\u7684\u53ef\u8fed\u4ee3\u5bf9\u8c61\u5305\u62ec\u5217\u8868\u3001\u5143\u7ec4\u3001\u96c6\u5408\u3001\u5b57\u5178\u548c\u5b57\u7b26\u4e32\u3002<\/p>\n<\/p>\n
my_list = [1, 2, 3]<\/p>\n
my_iter = iter(my_list)  # \u901a\u8fc7iter()\u51fd\u6570\u83b7\u53d6\u8fed\u4ee3\u5668<\/p>\n
print(next(my_iter))  # \u8f93\u51fa: 1<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cmy_list\u662f\u4e00\u4e2a\u53ef\u8fed\u4ee3\u5bf9\u8c61\uff0c\u901a\u8fc7iter()\u51fd\u6570\u53ef\u4ee5\u83b7\u53d6\u5176\u8fed\u4ee3\u5668\u3002<\/p>\n<\/p>\n
2. \u8fed\u4ee3\u5668<\/h4>\n<\/p>\n
\u8fed\u4ee3\u5668\u662f\u5b9e\u73b0\u4e86__next__\u65b9\u6cd5\u7684\u5bf9\u8c61\uff0c\u5b83\u53ef\u4ee5\u901a\u8fc7next()\u51fd\u6570\u83b7\u53d6\u4e0b\u4e00\u4e2a\u5143\u7d20\u3002<\/p>\n<\/p>\n
class Counter:<\/p>\n
    def __init__(self, low, high):<\/p>\n
        self.current = low<\/p>\n
        self.high = high<\/p>\n
    def __iter__(self):<\/p>\n
        return self<\/p>\n
    def __next__(self):<\/p>\n
        if self.current > self.high:<\/p>\n
            raise StopIteration<\/p>\n
        else:<\/p>\n
            self.current += 1<\/p>\n
            return self.current - 1<\/p>\n
counter = Counter(1, 5)<\/p>\n
print(next(counter))  # \u8f93\u51fa: 1<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cCounter\u7c7b\u662f\u4e00\u4e2a\u8fed\u4ee3\u5668\uff0c\u5b83\u5b9e\u73b0\u4e86__next__\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
\u516d\u3001\u8fed\u4ee3\u7684\u9ad8\u7ea7\u7528\u6cd5<\/h3>\n<\/p>\n
\u5728Python\u4e2d\uff0c\u8fed\u4ee3\u4e0d\u4ec5\u9650\u4e8e\u57fa\u672c\u7684\u5faa\u73af\uff0c\u8fd8\u53ef\u4ee5\u901a\u8fc7itertools\u6a21\u5757\u7b49\u5e93\u5b9e\u73b0\u66f4\u590d\u6742\u7684\u8fed\u4ee3\u6a21\u5f0f\u3002<\/p>\n<\/p>\n
1. \u4f7f\u7528itertools\u6a21\u5757<\/h4>\n<\/p>\n
itertools\u6a21\u5757\u662f\u4e00\u4e2aPython\u6807\u51c6\u5e93\uff0c\u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u7528\u4e8e\u8fed\u4ee3\u7684\u5de5\u5177\u51fd\u6570\u3002\u5e38\u89c1\u7684\u51fd\u6570\u5305\u62eccount\u3001cycle\u548crepeat\u3002<\/p>\n<\/p>\n
import itertools<\/p>\n
\u65e0\u9650\u8ba1\u6570<\/strong><\/h2>\n
for number in itertools.count(10):<\/p>\n
    if number > 15:<\/p>\n
        break<\/p>\n
    print(number)<\/p>\n
\u65e0\u9650\u5faa\u73af<\/strong><\/h2>\n
colors = ['red', 'green', 'blue']<\/p>\n
for color in itertools.cycle(colors):<\/p>\n
    print(color)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0citertools.count\u4ece\u6307\u5b9a\u7684\u6570\u5b57\u5f00\u59cb\u65e0\u9650\u8ba1\u6570\uff0c\u800citertools.cycle\u65e0\u9650\u5faa\u73af\u904d\u5386\u63d0\u4f9b\u7684\u5e8f\u5217\u3002<\/p>\n<\/p>\n
2. \u7ec4\u5408\u4e0e\u6392\u5217<\/h4>\n<\/p>\n
itertools\u8fd8\u63d0\u4f9b\u4e86\u7ec4\u5408\u4e0e\u6392\u5217\u7684\u751f\u6210\u5de5\u5177\uff0c\u8fd9\u5728\u9700\u8981\u751f\u6210\u5143\u7d20\u7684\u6240\u6709\u53ef\u80fd\u7ec4\u5408\u65f6\u975e\u5e38\u6709\u7528\u3002<\/p>\n<\/p>\n
import itertools<\/p>\n
letters = ['a', 'b', 'c']<\/p>\n
combinations = itertools.combinations(letters, 2)<\/p>\n
for combination in combinations:<\/p>\n
    print(combination)<\/p>\n
permutations = itertools.permutations(letters, 2)<\/p>\n
for permutation in permutations:<\/p>\n
    print(permutation)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0citertools.combinations\u751f\u6210\u4e86\u5143\u7d20\u7684\u6240\u6709\u53ef\u80fd\u7ec4\u5408\uff0c\u800citertools.permutations\u751f\u6210\u4e86\u5143\u7d20\u7684\u6240\u6709\u53ef\u80fd\u6392\u5217\u3002<\/p>\n<\/p>\n
\u4e03\u3001\u8fed\u4ee3\u5668\u4e0e\u6027\u80fd<\/h3>\n<\/p>\n
\u7406\u89e3\u8fed\u4ee3\u5668\u7684\u6027\u80fd\u7279\u5f81\u5bf9\u4e8e\u7f16\u5199\u9ad8\u6548\u7684Python\u4ee3\u7801\u81f3\u5173\u91cd\u8981\u3002\u8fed\u4ee3\u5668\u901a\u8fc7\u60f0\u6027\u8ba1\u7b97\u7684\u65b9\u5f0f\u51cf\u5c11\u4e86\u5185\u5b58\u4f7f\u7528\uff0c\u56e0\u6b64\u5728\u5904\u7406\u5927\u6570\u636e\u96c6\u65f6\u5c24\u4e3a\u91cd\u8981\u3002<\/p>\n<\/p>\n
1. \u60f0\u6027\u8ba1\u7b97\u7684\u4f18\u52bf<\/h4>\n<\/p>\n
\u60f0\u6027\u8ba1\u7b97\u610f\u5473\u7740\u8ba1\u7b97\u4ec5\u5728\u9700\u8981\u65f6\u8fdb\u884c\uff0c\u8fd9\u53ef\u4ee5\u663e\u8457\u51cf\u5c11\u5185\u5b58\u4f7f\u7528\u3002\u4f8b\u5982\uff0c\u751f\u6210\u5668\u901a\u8fc7yield\u4e00\u6b21\u751f\u6210\u4e00\u4e2a\u5143\u7d20\uff0c\u800c\u4e0d\u662f\u5c06\u6240\u6709\u5143\u7d20\u5b58\u50a8\u5728\u5185\u5b58\u4e2d\u3002<\/p>\n<\/p>\n
def large_range(n):<\/p>\n
    for i in range(n):<\/p>\n
        yield i<\/p>\n
for number in large_range(1000000):<\/p>\n
    if number > 10:<\/p>\n
        break<\/p>\n
    print(number)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0clarge_range\u51fd\u6570\u751f\u6210\u4e00\u4e2a\u5927\u8303\u56f4\u7684\u6570\u5b57\uff0c\u4f46\u7531\u4e8e\u4f7f\u7528\u4e86\u751f\u6210\u5668\uff0c\u5185\u5b58\u4f7f\u7528\u4fdd\u6301\u5728\u6700\u4f4e\u9650\u5ea6\u3002<\/p>\n<\/p>\n
2. \u5185\u5b58\u6548\u7387\u7684\u63d0\u5347<\/h4>\n<\/p>\n
\u4f7f\u7528\u751f\u6210\u5668\u548c\u8fed\u4ee3\u5668\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u5185\u5b58\u6548\u7387\uff0c\u7279\u522b\u662f\u5728\u5904\u7406\u5927\u578b\u6570\u636e\u96c6\u6216\u6d41\u5f0f\u6570\u636e\u65f6\u3002\u4f8b\u5982\uff0c\u5728\u8bfb\u53d6\u5927\u578b\u6587\u4ef6\u65f6\uff0c\u4f7f\u7528\u751f\u6210\u5668\u53ef\u4ee5\u9010\u884c\u8bfb\u53d6\u6587\u4ef6\uff0c\u800c\u4e0d\u662f\u4e00\u6b21\u6027\u5c06\u6574\u4e2a\u6587\u4ef6\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\u3002<\/p>\n<\/p>\n
def read_large_file(file_path):<\/p>\n
    with open(file_path) as file:<\/p>\n
        for line in file:<\/p>\n
            yield line.strip()<\/p>\n
for line in read_large_file("large_file.txt"):<\/p>\n
    print(line)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cread_large_file\u51fd\u6570\u4f7f\u7528\u751f\u6210\u5668\u9010\u884c\u8bfb\u53d6\u6587\u4ef6\uff0c\u8fd9\u79cd\u65b9\u6cd5\u6781\u5927\u5730\u63d0\u9ad8\u4e86\u5185\u5b58\u6548\u7387\u3002<\/p>\n<\/p>\n
\u516b\u3001\u8fed\u4ee3\u5668\u7684\u5c40\u9650\u6027<\/h3>\n<\/p>\n
\u5c3d\u7ba1\u8fed\u4ee3\u5668\u5728Python\u4e2d\u975e\u5e38\u5f3a\u5927\uff0c\u4f46\u5b83\u4eec\u4e5f\u6709\u4e00\u4e9b\u5c40\u9650\u6027\u3002\u5728\u4f7f\u7528\u8fed\u4ee3\u5668\u65f6\uff0c\u4e86\u89e3\u8fd9\u4e9b\u9650\u5236\u53ef\u4ee5\u5e2e\u52a9\u907f\u514d\u5e38\u89c1\u7684\u9519\u8bef\u3002<\/p>\n<\/p>\n
1. \u5355\u6b21\u904d\u5386<\/h4>\n<\/p>\n
\u8fed\u4ee3\u5668\u53ea\u80fd\u904d\u5386\u4e00\u6b21\uff0c\u8fd9\u610f\u5473\u7740\u4e00\u65e6\u8fed\u4ee3\u5b8c\u6210\uff0c\u5c31\u65e0\u6cd5\u91cd\u7f6e\u6216\u91cd\u65b0\u5f00\u59cb\u8fed\u4ee3\u3002<\/p>\n<\/p>\n
my_list = [1, 2, 3]<\/p>\n
my_iter = iter(my_list)<\/p>\n
print(next(my_iter))  # \u8f93\u51fa: 1<\/p>\n
print(next(my_iter))  # \u8f93\u51fa: 2<\/p>\n
\u91cd\u65b0\u4f7f\u7528\u8fed\u4ee3\u5668\u65f6\u4f1a\u5f15\u53d1\u9519\u8bef<\/strong><\/h2>\n
print(next(my_iter))  # \u8f93\u51fa: 3<\/strong><\/h2>\n
print(next(my_iter))  # \u5f15\u53d1 StopIteration<\/strong><\/h2>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cmy_iter\u53ea\u80fd\u904d\u5386\u4e00\u6b21\uff0c\u4e4b\u540e\u7684\u8c03\u7528\u5c06\u5f15\u53d1StopIteration\u5f02\u5e38\u3002<\/p>\n<\/p>\n
2. \u4e0d\u652f\u6301\u7d22\u5f15<\/h4>\n<\/p>\n
\u8fed\u4ee3\u5668\u4e0d\u652f\u6301\u7d22\u5f15\u8bbf\u95ee\u5143\u7d20\uff0c\u8fd9\u4e0e\u5217\u8868\u7b49\u6570\u636e\u7ed3\u6784\u4e0d\u540c\u3002\u8981\u8bbf\u95ee\u7279\u5b9a\u4f4d\u7f6e\u7684\u5143\u7d20\uff0c\u5fc5\u987b\u904d\u5386\u8fed\u4ee3\u5668\u76f4\u5230\u8be5\u4f4d\u7f6e\u3002<\/p>\n<\/p>\n
class Fibonacci:<\/p>\n
    def __init__(self, max):<\/p>\n
        self.max = max<\/p>\n
        self.a, self.b = 0, 1<\/p>\n
    def __iter__(self):<\/p>\n
        return self<\/p>\n
    def __next__(self):<\/p>\n
        if self.a > self.max:<\/p>\n
            raise StopIteration<\/p>\n
        a, self.a, self.b = self.a, self.b, self.a + self.b<\/p>\n
        return a<\/p>\n
fib = Fibonacci(10)<\/p>\n
fib_list = list(fib)<\/p>\n
print(fib_list[2])  # \u8f93\u51fa: 1<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u5fc5\u987b\u5c06\u8fed\u4ee3\u5668\u8f6c\u6362\u4e3a\u5217\u8868\u624d\u80fd\u4f7f\u7528\u7d22\u5f15\u8bbf\u95ee\u5143\u7d20\u3002<\/p>\n<\/p>\n
\u4e5d\u3001\u8fed\u4ee3\u5668\u7684\u5b9e\u9645\u5e94\u7528<\/h3>\n<\/p>\n
\u8fed\u4ee3\u5668\u5728Python\u4e2d\u7684\u5e94\u7528\u975e\u5e38\u5e7f\u6cdb\uff0c\u8bb8\u591a\u5185\u7f6e\u51fd\u6570\u548c\u5e93\u90fd\u4f7f\u7528\u8fed\u4ee3\u5668\u534f\u8bae\u3002\u8fd9\u4f7f\u5f97\u8fed\u4ee3\u5668\u6210\u4e3a\u7f16\u5199\u9ad8\u6548\u3001\u53ef\u6269\u5c55\u7684Python\u4ee3\u7801\u7684\u57fa\u7840\u3002<\/p>\n<\/p>\n
1. \u6570\u636e\u5904\u7406<\/h4>\n<\/p>\n
\u5728\u6570\u636e\u5904\u7406\u4e2d\uff0c\u8fed\u4ee3\u5668\u5e38\u7528\u4e8e\u904d\u5386\u5927\u578b\u6570\u636e\u96c6\uff0c\u4f8b\u5982\u4ece\u6570\u636e\u5e93\u4e2d\u63d0\u53d6\u6570\u636e\u6216\u5904\u7406\u6d41\u5f0f\u6570\u636e\u3002\u901a\u8fc7\u4f7f\u7528\u751f\u6210\u5668\uff0c\u53ef\u4ee5\u5b9e\u73b0\u9ad8\u6548\u7684\u6570\u636e\u5904\u7406\u6d41\u6c34\u7ebf\u3002<\/p>\n<\/p>\n
def data_pipeline(data):<\/p>\n
    for record in data:<\/p>\n
        yield process_record(record)<\/p>\n
def process_record(record):<\/p>\n
    # \u5904\u7406\u6570\u636e\u7684\u903b\u8f91<\/p>\n
    return record * 2<\/p>\n
data = range(100)<\/p>\n
for processed_data in data_pipeline(data):<\/p>\n
    print(processed_data)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cdata_pipeline\u51fd\u6570\u4f7f\u7528\u751f\u6210\u5668\u6765\u5904\u7406\u6570\u636e\u96c6\u4e2d\u7684\u6bcf\u4e2a\u8bb0\u5f55\u3002<\/p>\n<\/p>\n
2. \u6587\u4ef6\u64cd\u4f5c<\/h4>\n<\/p>\n
\u8fed\u4ee3\u5668\u5728\u6587\u4ef6\u64cd\u4f5c\u4e2d\u4e5f\u975e\u5e38\u6709\u7528\uff0c\u5c24\u5176\u662f\u5728\u5904\u7406\u5927\u578b\u6587\u4ef6\u65f6\u3002\u901a\u8fc7\u9010\u884c\u8bfb\u53d6\u6587\u4ef6\uff0c\u53ef\u4ee5\u907f\u514d\u5c06\u6574\u4e2a\u6587\u4ef6\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\u3002<\/p>\n<\/p>\n
def process_large_file(file_path):<\/p>\n
    with open(file_path) as file:<\/p>\n
        for line in file:<\/p>\n
            yield process_line(line)<\/p>\n
def process_line(line):<\/p>\n
    # \u5904\u7406\u884c\u7684\u903b\u8f91<\/p>\n
    return line.strip()<\/p>\n
for processed_line in process_large_file("large_file.txt"):<\/p>\n
    print(processed_line)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cprocess_large_file\u51fd\u6570\u901a\u8fc7\u751f\u6210\u5668\u9010\u884c\u8bfb\u53d6\u548c\u5904\u7406\u6587\u4ef6\u3002<\/p>\n<\/p>\n
3. \u65e0\u9650\u5e8f\u5217<\/h4>\n<\/p>\n
\u8fed\u4ee3\u5668\u7279\u522b\u9002\u5408\u751f\u6210\u548c\u5904\u7406\u65e0\u9650\u5e8f\u5217\uff0c\u4f8b\u5982\u6570\u5b66\u4e0a\u7684\u65e0\u7a77\u6570\u5217\u6216\u5b9e\u65f6\u751f\u6210\u7684\u6570\u636e\u6d41\u3002<\/p>\n<\/p>\n
def infinite_numbers():<\/p>\n
    num = 0<\/p>\n
    while True:<\/p>\n
        yield num<\/p>\n
        num += 1<\/p>\n
for number in infinite_numbers():<\/p>\n
    if number > 10:<\/p>\n
        break<\/p>\n
    print(number)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cinfinite_numbers\u51fd\u6570\u751f\u6210\u4e00\u4e2a\u65e0\u9650\u7684\u6570\u5b57\u5e8f\u5217\uff0c\u76f4\u5230\u6ee1\u8db3\u7279\u5b9a\u6761\u4ef6\u3002<\/p>\n<\/p>\n
\u5341\u3001\u603b\u7ed3<\/h3>\n<\/p>\n
Python\u4e2d\u7684\u8fed\u4ee3\u662f\u4e00\u4e2a\u5f3a\u5927\u800c\u7075\u6d3b\u7684\u5de5\u5177\uff0c\u5b83\u4e3a\u5904\u7406\u548c\u904d\u5386\u6570\u636e\u63d0\u4f9b\u4e86\u591a\u79cd\u65b9\u5f0f\u3002\u901a\u8fc7\u7406\u89e3for\u5faa\u73af\u3001while\u5faa\u73af\u548c\u751f\u6210\u5668\u7b49\u57fa\u672c\u6982\u5ff5\uff0c\u4ee5\u53ca\u8fed\u4ee3\u5668\u534f\u8bae\u7684\u7ec6\u8282\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u7f16\u5199\u51fa\u66f4\u9ad8\u6548\u548c\u53ef\u7ef4\u62a4\u7684\u4ee3\u7801\u3002\u65e0\u8bba\u662f\u7b80\u5355\u7684\u6570\u636e\u904d\u5386\u8fd8\u662f\u590d\u6742\u7684\u6570\u636e\u5904\u7406\u6d41\u6c34\u7ebf\uff0c\u8fed\u4ee3\u5668\u90fd\u80fd\u63d0\u4f9b\u6709\u6548\u7684\u89e3\u51b3\u65b9\u6848\u3002\u5728\u5b9e\u8df5\u4e2d\uff0c\u9009\u62e9\u5408\u9002\u7684\u8fed\u4ee3\u65b9\u6cd5\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u7a0b\u5e8f\u7684\u6027\u80fd\u548c\u5185\u5b58\u6548\u7387\uff0c\u7279\u522b\u662f\u5728\u5904\u7406\u5927\u89c4\u6a21\u6570\u636e\u6216\u5b9e\u65f6\u6570\u636e\u6d41\u65f6\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 Python\u4e2d\u8fed\u4ee3\u7684\u57fa\u672c\u6982\u5ff5\u662f\u4ec0\u4e48\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u8fed\u4ee3\u662f\u6307\u904d\u5386\u4e00\u4e2a\u53ef\u8fed\u4ee3\u5bf9\u8c61\uff08\u5982\u5217\u8868\u3001\u5143\u7ec4\u3001\u5b57\u5178\u3001\u96c6\u5408\u7b49\uff09\u4e2d\u7684\u5143\u7d20\u7684\u8fc7\u7a0b\u3002Python\u4f7f\u7528\u8fed\u4ee3\u5668\u534f\u8bae\u6765\u5b9e\u73b0\u8fd9\u4e00\u8fc7\u7a0b\uff0c\u4e3b\u8981\u5305\u62ec__iter__()<\/code>\u548c__next__()<\/code>\u4e24\u4e2a\u65b9\u6cd5\u3002\u901a\u8fc7\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u53ef\u4ee5\u9010\u4e2a\u8bbf\u95ee\u53ef\u8fed\u4ee3\u5bf9\u8c61\u4e2d\u7684\u5143\u7d20\uff0c\u800c\u65e0\u9700\u76f4\u63a5\u5904\u7406\u7d22\u5f15\u6216\u5176\u4ed6\u590d\u6742\u903b\u8f91\u3002<\/p>\n
\u4f7f\u7528\u54ea\u4e9b\u5de5\u5177\u53ef\u4ee5\u5b9e\u73b0Python\u4e2d\u7684\u8fed\u4ee3\uff1f<\/strong>
Python\u63d0\u4f9b\u4e86\u591a\u79cd\u5de5\u5177\u6765\u5b9e\u73b0\u8fed\u4ee3\u3002\u6700\u5e38\u7528\u7684\u65b9\u5f0f\u662f\u4f7f\u7528for<\/code>\u5faa\u73af\uff0c\u5b83\u53ef\u4ee5\u8f7b\u677e\u904d\u5386\u5217\u8868\u3001\u5b57\u5178\u3001\u96c6\u5408\u7b49\u3002\u6b64\u5916\uff0cwhile<\/code>\u5faa\u73af\u4e5f\u53ef\u4ee5\u7528\u4e8e\u8fed\u4ee3\uff0c\u901a\u8fc7\u624b\u52a8\u7ba1\u7406\u7d22\u5f15\u6216\u8fed\u4ee3\u5668\u6765\u5b9e\u73b0\u3002Python\u7684\u5185\u7f6e\u51fd\u6570enumerate()<\/code>\u548czip()<\/code>\u4e5f\u5e38\u7528\u4e8e\u5728\u8fed\u4ee3\u65f6\u540c\u65f6\u83b7\u53d6\u7d22\u5f15\u6216\u591a\u4e2a\u53ef\u8fed\u4ee3\u5bf9\u8c61\u7684\u5143\u7d20\u3002<\/p>\n
\u5982\u4f55\u5904\u7406Python\u8fed\u4ee3\u4e2d\u7684\u5f02\u5e38\u60c5\u51b5\uff1f<\/strong>
\u5728\u8fed\u4ee3\u8fc7\u7a0b\u4e2d\uff0c\u53ef\u80fd\u4f1a\u9047\u5230\u4e00\u4e9b\u5f02\u5e38\u60c5\u51b5\uff0c\u6bd4\u5982\u7a7a\u96c6\u5408\u3001\u7c7b\u578b\u9519\u8bef\u7b49\u3002\u53ef\u4ee5\u4f7f\u7528try-except<\/code>\u8bed\u53e5\u6765\u6355\u83b7\u8fd9\u4e9b\u5f02\u5e38\uff0c\u4ece\u800c\u907f\u514d\u7a0b\u5e8f\u5d29\u6e83\u3002\u901a\u8fc7\u5408\u7406\u7684\u5f02\u5e38\u5904\u7406\uff0c\u786e\u4fdd\u5728\u8fed\u4ee3\u8fc7\u7a0b\u4e2d\u5373\u4f7f\u9047\u5230\u95ee\u9898\uff0c\u7a0b\u5e8f\u4e5f\u80fd\u591f\u7ee7\u7eed\u8fd0\u884c\u6216\u7ed9\u4e88\u7528\u6237\u53cb\u597d\u7684\u63d0\u793a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Python\u4e2d\u7684\u8fed\u4ee3\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u5b9e\u73b0\uff0c\u5305\u62ec\u4f7f\u7528for\u5faa\u73af\u3001while\u5faa\u73af\u548c\u751f\u6210\u5668\u7b49\u3002\u5bf9\u4e8e\u5927\u591a\u6570\u573a\u666f\uff0cfor […]","protected":false},"author":3,"featured_media":925487,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/925481"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=925481"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/925481\/revisions"}],"predecessor-version":[{"id":925488,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/925481\/revisions\/925488"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/925487"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=925481"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=925481"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=925481"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}