{"id":1105345,"date":"2025-01-08T16:30:07","date_gmt":"2025-01-08T08:30:07","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1105345.html"},"modified":"2025-01-08T16:30:10","modified_gmt":"2025-01-08T08:30:10","slug":"python%e4%b8%ad%e5%a6%82%e4%bd%95%e4%bd%bffor%e5%be%aa%e7%8e%af%e4%bb%8e%e5%a4%b4%e5%bc%80%e5%a7%8b","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1105345.html","title":{"rendered":"python\u4e2d\u5982\u4f55\u4f7ffor\u5faa\u73af\u4ece\u5934\u5f00\u59cb"},"content":{"rendered":"

\"python\u4e2d\u5982\u4f55\u4f7ffor\u5faa\u73af\u4ece\u5934\u5f00\u59cb\"<\/p>\n

\u5728 Python \u4e2d\u4f7f for \u5faa\u73af\u4ece\u5934\u5f00\u59cb\u7684\u51e0\u79cd\u65b9\u6cd5\u6709\uff1a\u4f7f\u7528\u5faa\u73af\u5d4c\u5957\u3001\u4f7f\u7528\u9012\u5f52\u51fd\u6570\u3001\u4f7f\u7528 while \u5faa\u73af\u3002<\/strong><\/p>\n<\/p>\n

\u5728 Python \u4e2d\uff0cfor \u5faa\u73af\u662f\u4e00\u79cd\u5f3a\u5927\u800c\u7075\u6d3b\u7684\u5de5\u5177\uff0c\u5141\u8bb8\u6211\u4eec\u904d\u5386\u5e8f\u5217\uff08\u5982\u5217\u8868\u3001\u5b57\u7b26\u4e32\u3001\u5143\u7ec4\u7b49\uff09\u4e2d\u7684\u6bcf\u4e00\u4e2a\u5143\u7d20\u3002\u4f46\u662f\uff0c\u5982\u4f55\u4f7f for \u5faa\u73af\u4ece\u5934\u5f00\u59cb\u6267\u884c\u5462\uff1f\u8fd9\u901a\u5e38\u9700\u8981\u5728\u7279\u5b9a\u6761\u4ef6\u4e0b\u91cd\u65b0\u542f\u52a8\u5faa\u73af\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u5728\u9047\u5230\u67d0\u4e2a\u7279\u5b9a\u6761\u4ef6\u65f6\u4ece\u5934\u5f00\u59cb\u904d\u5386\u5217\u8868\u3002\u4e0b\u9762\u8be6\u7ec6\u4ecb\u7ecd\u51e0\u79cd\u5e38\u89c1\u65b9\u6cd5\u53ca\u5176\u5b9e\u73b0\u3002<\/p>\n<\/p>\n

\u4f7f\u7528\u5faa\u73af\u5d4c\u5957<\/strong><\/p>\n<\/p>\n

\u5faa\u73af\u5d4c\u5957\u662f\u4f7f for \u5faa\u73af\u4ece\u5934\u5f00\u59cb\u7684\u4e00\u79cd\u7b80\u5355\u65b9\u6cd5\u3002\u901a\u8fc7\u5728\u5916\u5c42\u5faa\u73af\u4e2d\u63a7\u5236\u5185\u5c42\u5faa\u73af\u7684\u91cd\u542f\uff0c\u6211\u4eec\u53ef\u4ee5\u5b9e\u73b0\u4ece\u5934\u5f00\u59cb\u7684\u6548\u679c\u3002<\/p>\n<\/p>\n

# \u793a\u4f8b\u4ee3\u7801<\/p>\n
data = [1, 2, 3, 4, 5]<\/p>\n
while True:<\/p>\n
    for item in data:<\/p>\n
        print(item)<\/p>\n
        if item == 3:<\/p>\n
            print("Restarting loop...")<\/p>\n
            break<\/p>\n
    else:<\/p>\n
        break<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0cwhile True<\/code> \u5faa\u73af\u4e0d\u65ad\u6267\u884c\uff0c\u76f4\u5230\u5185\u90e8\u7684 for<\/code> \u5faa\u73af\u9047\u5230\u6761\u4ef6 item == 3<\/code>\uff0c\u7136\u540e break<\/code> \u9000\u51fa\u5f53\u524d\u7684 for<\/code> \u5faa\u73af\u3002\u5916\u5c42\u7684 while<\/code> \u5faa\u73af\u4f1a\u91cd\u65b0\u5f00\u59cb\u4e00\u6b21\u65b0\u7684 for<\/code> \u5faa\u73af\uff0c\u4ece\u800c\u5b9e\u73b0\u4e86\u4ece\u5934\u5f00\u59cb\u7684\u6548\u679c\u3002<\/p>\n<\/p>\n
\u4f7f\u7528\u9012\u5f52\u51fd\u6570<\/strong><\/p>\n<\/p>\n
\u9012\u5f52\u51fd\u6570\u662f\u4e00\u79cd\u51fd\u6570\u8c03\u7528\u81ea\u8eab\u7684\u6280\u672f\uff0c\u53ef\u4ee5\u7528\u4e8e\u591a\u79cd\u573a\u666f\uff0c\u5305\u62ec\u4f7f for \u5faa\u73af\u4ece\u5934\u5f00\u59cb\u3002<\/p>\n<\/p>\n
# \u793a\u4f8b\u4ee3\u7801<\/p>\n
def recursive_loop(data, index=0):<\/p>\n
    if index < len(data):<\/p>\n
        print(data[index])<\/p>\n
        if data[index] == 3:<\/p>\n
            print("Restarting loop...")<\/p>\n
            return recursive_loop(data)<\/p>\n
        return recursive_loop(data, index + 1)<\/p>\n
data = [1, 2, 3, 4, 5]<\/p>\n
recursive_loop(data)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0crecursive_loop<\/code> \u51fd\u6570\u901a\u8fc7\u9012\u5f52\u8c03\u7528\u5b9e\u73b0\u4e86\u4ece\u5934\u5f00\u59cb\u904d\u5386 data<\/code> \u5217\u8868\u7684\u529f\u80fd\u3002\u5f53\u9047\u5230\u6761\u4ef6 data[index] == 3<\/code> \u65f6\uff0c\u51fd\u6570\u91cd\u65b0\u8c03\u7528\u81ea\u8eab\uff0c\u4ece\u800c\u5b9e\u73b0\u4e86\u4ece\u5934\u5f00\u59cb\u7684\u6548\u679c\u3002<\/p>\n<\/p>\n
\u4f7f\u7528 while \u5faa\u73af<\/strong><\/p>\n<\/p>\n
\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528 while<\/code> \u5faa\u73af\u6765\u63a7\u5236 for \u5faa\u73af\u7684\u91cd\u65b0\u5f00\u59cb\u3002\u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u70b9\u662f\u903b\u8f91\u6e05\u6670\uff0c\u5bb9\u6613\u7406\u89e3\u3002<\/p>\n<\/p>\n
# \u793a\u4f8b\u4ee3\u7801<\/p>\n
data = [1, 2, 3, 4, 5]<\/p>\n
index = 0<\/p>\n
while index < len(data):<\/p>\n
    for item in data:<\/p>\n
        print(item)<\/p>\n
        if item == 3:<\/p>\n
            print("Restarting loop...")<\/p>\n
            index = 0<\/p>\n
            break<\/p>\n
    else:<\/p>\n
        break<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u4f7f\u7528 while<\/code> \u5faa\u73af\u6765\u63a7\u5236 for<\/code> \u5faa\u73af\u7684\u91cd\u65b0\u5f00\u59cb\u3002\u5f53 for<\/code> \u5faa\u73af\u4e2d\u7684\u6761\u4ef6 item == 3<\/code> \u6ee1\u8db3\u65f6\uff0cindex<\/code> \u88ab\u91cd\u7f6e\u4e3a 0\uff0c\u4ece\u800c\u4f7f while<\/code> \u5faa\u73af\u91cd\u65b0\u542f\u52a8 for<\/code> \u5faa\u73af\u3002<\/p>\n<\/p>\n
\u603b\u7ed3<\/strong><\/p>\n<\/p>\n
\u5728 Python \u4e2d\uff0c\u4f7f for \u5faa\u73af\u4ece\u5934\u5f00\u59cb\u7684\u65b9\u6cd5\u6709\u5f88\u591a\uff0c\u5e38\u89c1\u7684\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528\u5faa\u73af\u5d4c\u5957\u3001\u4f7f\u7528\u9012\u5f52\u51fd\u6570\u3001\u4ee5\u53ca\u4f7f\u7528 while \u5faa\u73af\u3002\u8fd9\u4e9b\u65b9\u6cd5\u5404\u6709\u4f18\u7f3a\u70b9\uff0c\u5177\u4f53\u9009\u62e9\u53d6\u51b3\u4e8e\u5177\u4f53\u7684\u5e94\u7528\u573a\u666f\u548c\u4ee3\u7801\u9700\u6c42\u3002\u65e0\u8bba\u4f7f\u7528\u54ea\u79cd\u65b9\u6cd5\uff0c\u90fd\u9700\u8981\u6ce8\u610f\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u6548\u7387\uff0c\u4ee5\u4fdd\u8bc1\u7a0b\u5e8f\u7684\u9ad8\u6548\u8fd0\u884c\u3002<\/p>\n<\/p>\n
\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u63a2\u8ba8\u8fd9\u4e9b\u65b9\u6cd5\u7684\u5b9e\u73b0\u7ec6\u8282\u548c\u5e94\u7528\u573a\u666f\u3002<\/p>\n<\/p>\n
\u4e00\u3001\u4f7f\u7528\u5faa\u73af\u5d4c\u5957<\/p>\n<\/p>\n
\u5faa\u73af\u5d4c\u5957\u662f\u6700\u76f4\u89c2\u7684\u4e00\u79cd\u65b9\u6cd5\uff0c\u901a\u8fc7\u5728\u5916\u5c42\u5faa\u73af\u4e2d\u63a7\u5236\u5185\u5c42\u5faa\u73af\u7684\u91cd\u542f\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u5b9e\u73b0\u4ece\u5934\u5f00\u59cb\u7684\u6548\u679c\u3002\u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u70b9\u662f\u4ee3\u7801\u7b80\u6d01\uff0c\u5bb9\u6613\u7406\u89e3\u3002<\/p>\n<\/p>\n
# \u793a\u4f8b\u4ee3\u7801<\/p>\n
data = [1, 2, 3, 4, 5]<\/p>\n
while True:<\/p>\n
    for item in data:<\/p>\n
        print(item)<\/p>\n
        if item == 3:<\/p>\n
            print("Restarting loop...")<\/p>\n
            break<\/p>\n
    else:<\/p>\n
        break<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0cwhile True<\/code> \u5faa\u73af\u4e0d\u65ad\u6267\u884c\uff0c\u76f4\u5230\u5185\u90e8\u7684 for<\/code> \u5faa\u73af\u9047\u5230\u6761\u4ef6 item == 3<\/code>\uff0c\u7136\u540e break<\/code> \u9000\u51fa\u5f53\u524d\u7684 for<\/code> \u5faa\u73af\u3002\u5916\u5c42\u7684 while<\/code> \u5faa\u73af\u4f1a\u91cd\u65b0\u5f00\u59cb\u4e00\u6b21\u65b0\u7684 for<\/code> \u5faa\u73af\uff0c\u4ece\u800c\u5b9e\u73b0\u4e86\u4ece\u5934\u5f00\u59cb\u7684\u6548\u679c\u3002<\/p>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u9700\u8981\u5728\u7279\u5b9a\u6761\u4ef6\u4e0b\u91cd\u65b0\u5f00\u59cb\u5faa\u73af\u7684\u573a\u666f\uff0c\u4f8b\u5982\u5904\u7406\u6570\u636e\u6e05\u5355\u4e2d\u7684\u7279\u6b8a\u9879\uff0c\u6216\u8005\u5728\u6e38\u620f\u5faa\u73af\u4e2d\u91cd\u65b0\u5f00\u59cb\u67d0\u4e2a\u5173\u5361\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528\u9012\u5f52\u51fd\u6570<\/p>\n<\/p>\n
\u9012\u5f52\u51fd\u6570\u662f\u4e00\u79cd\u51fd\u6570\u8c03\u7528\u81ea\u8eab\u7684\u6280\u672f\uff0c\u53ef\u4ee5\u7528\u4e8e\u591a\u79cd\u573a\u666f\uff0c\u5305\u62ec\u4f7f for \u5faa\u73af\u4ece\u5934\u5f00\u59cb\u3002\u9012\u5f52\u51fd\u6570\u7684\u4f18\u70b9\u662f\u4ee3\u7801\u7ed3\u6784\u6e05\u6670\uff0c\u6613\u4e8e\u7ef4\u62a4\u3002<\/p>\n<\/p>\n
# \u793a\u4f8b\u4ee3\u7801<\/p>\n
def recursive_loop(data, index=0):<\/p>\n
    if index < len(data):<\/p>\n
        print(data[index])<\/p>\n
        if data[index] == 3:<\/p>\n
            print("Restarting loop...")<\/p>\n
            return recursive_loop(data)<\/p>\n
        return recursive_loop(data, index + 1)<\/p>\n
data = [1, 2, 3, 4, 5]<\/p>\n
recursive_loop(data)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0crecursive_loop<\/code> \u51fd\u6570\u901a\u8fc7\u9012\u5f52\u8c03\u7528\u5b9e\u73b0\u4e86\u4ece\u5934\u5f00\u59cb\u904d\u5386 data<\/code> \u5217\u8868\u7684\u529f\u80fd\u3002\u5f53\u9047\u5230\u6761\u4ef6 data[index] == 3<\/code> \u65f6\uff0c\u51fd\u6570\u91cd\u65b0\u8c03\u7528\u81ea\u8eab\uff0c\u4ece\u800c\u5b9e\u73b0\u4e86\u4ece\u5934\u5f00\u59cb\u7684\u6548\u679c\u3002<\/p>\n<\/p>\n
\u9012\u5f52\u51fd\u6570\u9002\u7528\u4e8e\u9700\u8981\u5728\u590d\u6742\u6761\u4ef6\u4e0b\u91cd\u65b0\u5f00\u59cb\u5faa\u73af\u7684\u573a\u666f\uff0c\u4f8b\u5982\u5904\u7406\u5d4c\u5957\u7ed3\u6784\u6570\u636e\uff0c\u6216\u8005\u5728\u7b97\u6cd5\u5b9e\u73b0\u4e2d\u4f7f\u7528\u9012\u5f52\u601d\u60f3\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528 while \u5faa\u73af<\/p>\n<\/p>\n
\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528 while<\/code> \u5faa\u73af\u6765\u63a7\u5236 for \u5faa\u73af\u7684\u91cd\u65b0\u5f00\u59cb\u3002\u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u70b9\u662f\u903b\u8f91\u6e05\u6670\uff0c\u5bb9\u6613\u7406\u89e3\uff0c\u9002\u7528\u4e8e\u7b80\u5355\u7684\u5faa\u73af\u63a7\u5236\u573a\u666f\u3002<\/p>\n<\/p>\n
# \u793a\u4f8b\u4ee3\u7801<\/p>\n
data = [1, 2, 3, 4, 5]<\/p>\n
index = 0<\/p>\n
while index < len(data):<\/p>\n
    for item in data:<\/p>\n
        print(item)<\/p>\n
        if item == 3:<\/p>\n
            print("Restarting loop...")<\/p>\n
            index = 0<\/p>\n
            break<\/p>\n
    else:<\/p>\n
        break<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u4f7f\u7528 while<\/code> \u5faa\u73af\u6765\u63a7\u5236 for<\/code> \u5faa\u73af\u7684\u91cd\u65b0\u5f00\u59cb\u3002\u5f53 for<\/code> \u5faa\u73af\u4e2d\u7684\u6761\u4ef6 item == 3<\/code> \u6ee1\u8db3\u65f6\uff0cindex<\/code> \u88ab\u91cd\u7f6e\u4e3a 0\uff0c\u4ece\u800c\u4f7f while<\/code> \u5faa\u73af\u91cd\u65b0\u542f\u52a8 for<\/code> \u5faa\u73af\u3002<\/p>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u7b80\u5355\u7684\u5faa\u73af\u63a7\u5236\u573a\u666f\uff0c\u4f8b\u5982\u5728\u6570\u636e\u5904\u7406\u8fc7\u7a0b\u4e2d\u9700\u8981\u91cd\u65b0\u5f00\u59cb\u904d\u5386\u5217\u8868\uff0c\u6216\u8005\u5728\u7528\u6237\u8f93\u5165\u5904\u7406\u8fc7\u7a0b\u4e2d\u9700\u8981\u91cd\u65b0\u5f00\u59cb\u5faa\u73af\u3002<\/p>\n<\/p>\n
\u56db\u3001\u5176\u4ed6\u5b9e\u73b0\u65b9\u6cd5<\/p>\n<\/p>\n
\u9664\u4e86\u4e0a\u8ff0\u4e09\u79cd\u65b9\u6cd5\u5916\uff0c\u8fd8\u53ef\u4ee5\u901a\u8fc7\u5176\u4ed6\u65b9\u5f0f\u5b9e\u73b0 for \u5faa\u73af\u4ece\u5934\u5f00\u59cb\uff0c\u4f8b\u5982\u4f7f\u7528\u751f\u6210\u5668\u3001\u4f7f\u7528\u81ea\u5b9a\u4e49\u8fed\u4ee3\u5668\u7b49\u3002\u8fd9\u4e9b\u65b9\u6cd5\u7684\u5b9e\u73b0\u8f83\u4e3a\u590d\u6742\uff0c\u9002\u7528\u4e8e\u7279\u5b9a\u7684\u9ad8\u7ea7\u5e94\u7528\u573a\u666f\u3002<\/p>\n<\/p>\n
\u4f7f\u7528\u751f\u6210\u5668<\/strong><\/p>\n<\/p>\n
\u751f\u6210\u5668\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u8fed\u4ee3\u5668\uff0c\u5141\u8bb8\u6211\u4eec\u5728\u9700\u8981\u65f6\u751f\u6210\u5e8f\u5217\u4e2d\u7684\u5143\u7d20\u3002\u901a\u8fc7\u81ea\u5b9a\u4e49\u751f\u6210\u5668\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u7075\u6d3b\u63a7\u5236 for \u5faa\u73af\u7684\u91cd\u65b0\u5f00\u59cb\u3002<\/p>\n<\/p>\n
# \u793a\u4f8b\u4ee3\u7801<\/p>\n
def my_generator(data):<\/p>\n
    index = 0<\/p>\n
    while index < len(data):<\/p>\n
        yield data[index]<\/p>\n
        if data[index] == 3:<\/p>\n
            print("Restarting loop...")<\/p>\n
            index = 0<\/p>\n
        else:<\/p>\n
            index += 1<\/p>\n
data = [1, 2, 3, 4, 5]<\/p>\n
for item in my_generator(data):<\/p>\n
    print(item)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u81ea\u5b9a\u4e49\u7684\u751f\u6210\u5668\u51fd\u6570 my_generator<\/code> \u63a7\u5236\u4e86\u5e8f\u5217\u7684\u751f\u6210\u8fc7\u7a0b\u3002\u5f53\u9047\u5230\u6761\u4ef6 data[index] == 3<\/code> \u65f6\uff0c\u751f\u6210\u5668\u91cd\u65b0\u5f00\u59cb\u751f\u6210\u5143\u7d20\uff0c\u4ece\u800c\u5b9e\u73b0\u4e86\u4ece\u5934\u5f00\u59cb\u7684\u6548\u679c\u3002<\/p>\n<\/p>\n
\u751f\u6210\u5668\u9002\u7528\u4e8e\u9700\u8981\u7075\u6d3b\u63a7\u5236\u5e8f\u5217\u751f\u6210\u8fc7\u7a0b\u7684\u573a\u666f\uff0c\u4f8b\u5982\u5728\u6570\u636e\u6d41\u5904\u7406\u8fc7\u7a0b\u4e2d\u9700\u8981\u91cd\u65b0\u5f00\u59cb\u751f\u6210\u6570\u636e\uff0c\u6216\u8005\u5728\u590d\u6742\u7684\u7b97\u6cd5\u5b9e\u73b0\u4e2d\u4f7f\u7528\u751f\u6210\u5668\u601d\u60f3\u3002<\/p>\n<\/p>\n
\u4f7f\u7528\u81ea\u5b9a\u4e49\u8fed\u4ee3\u5668<\/strong><\/p>\n<\/p>\n
\u81ea\u5b9a\u4e49\u8fed\u4ee3\u5668\u662f\u4e00\u79cd\u9ad8\u7ea7\u7684\u5b9e\u73b0\u65b9\u6cd5\uff0c\u901a\u8fc7\u5b9a\u4e49\u4e00\u4e2a\u7c7b\u5b9e\u73b0 __iter__<\/code> \u548c __next__<\/code> \u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u7075\u6d3b\u63a7\u5236\u8fed\u4ee3\u8fc7\u7a0b\uff0c\u4ece\u800c\u5b9e\u73b0 for \u5faa\u73af\u7684\u91cd\u65b0\u5f00\u59cb\u3002<\/p>\n<\/p>\n
# \u793a\u4f8b\u4ee3\u7801<\/p>\n
class MyIterator:<\/p>\n
    def __init__(self, data):<\/p>\n
        self.data = data<\/p>\n
        self.index = 0<\/p>\n
    def __iter__(self):<\/p>\n
        return self<\/p>\n
    def __next__(self):<\/p>\n
        if self.index >= len(self.data):<\/p>\n
            rAI<\/a>se StopIteration<\/p>\n
        item = self.data[self.index]<\/p>\n
        if item == 3:<\/p>\n
            print("Restarting loop...")<\/p>\n
            self.index = 0<\/p>\n
        else:<\/p>\n
            self.index += 1<\/p>\n
        return item<\/p>\n
data = [1, 2, 3, 4, 5]<\/p>\n
for item in MyIterator(data):<\/p>\n
    print(item)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u81ea\u5b9a\u4e49\u7684\u8fed\u4ee3\u5668\u7c7b MyIterator<\/code> \u63a7\u5236\u4e86\u8fed\u4ee3\u8fc7\u7a0b\u3002\u5f53\u9047\u5230\u6761\u4ef6 item == 3<\/code> \u65f6\uff0c\u8fed\u4ee3\u5668\u91cd\u65b0\u5f00\u59cb\u8fed\u4ee3\uff0c\u4ece\u800c\u5b9e\u73b0\u4e86\u4ece\u5934\u5f00\u59cb\u7684\u6548\u679c\u3002<\/p>\n<\/p>\n
\u81ea\u5b9a\u4e49\u8fed\u4ee3\u5668\u9002\u7528\u4e8e\u9700\u8981\u7cbe\u7ec6\u63a7\u5236\u8fed\u4ee3\u8fc7\u7a0b\u7684\u573a\u666f\uff0c\u4f8b\u5982\u5728\u590d\u6742\u7684\u6570\u636e\u7ed3\u6784\u904d\u5386\u8fc7\u7a0b\u4e2d\u9700\u8981\u91cd\u65b0\u5f00\u59cb\u8fed\u4ee3\uff0c\u6216\u8005\u5728\u9ad8\u7ea7\u7b97\u6cd5\u5b9e\u73b0\u4e2d\u4f7f\u7528\u8fed\u4ee3\u5668\u601d\u60f3\u3002<\/p>\n<\/p>\n
\u603b\u7ed3<\/strong><\/p>\n<\/p>\n
\u5728 Python \u4e2d\uff0c\u4f7f for \u5faa\u73af\u4ece\u5934\u5f00\u59cb\u7684\u65b9\u6cd5\u6709\u5f88\u591a\uff0c\u5e38\u89c1\u7684\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528\u5faa\u73af\u5d4c\u5957\u3001\u4f7f\u7528\u9012\u5f52\u51fd\u6570\u3001\u4f7f\u7528 while \u5faa\u73af\u3001\u4f7f\u7528\u751f\u6210\u5668\u3001\u4ee5\u53ca\u4f7f\u7528\u81ea\u5b9a\u4e49\u8fed\u4ee3\u5668\u3002\u8fd9\u4e9b\u65b9\u6cd5\u5404\u6709\u4f18\u7f3a\u70b9\uff0c\u5177\u4f53\u9009\u62e9\u53d6\u51b3\u4e8e\u5177\u4f53\u7684\u5e94\u7528\u573a\u666f\u548c\u4ee3\u7801\u9700\u6c42\u3002<\/p>\n<\/p>\n
\u65e0\u8bba\u4f7f\u7528\u54ea\u79cd\u65b9\u6cd5\uff0c\u90fd\u9700\u8981\u6ce8\u610f\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u6548\u7387\uff0c\u4ee5\u4fdd\u8bc1\u7a0b\u5e8f\u7684\u9ad8\u6548\u8fd0\u884c\u3002\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\uff0c\u5b9e\u73b0 for \u5faa\u73af\u7684\u91cd\u65b0\u5f00\u59cb\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u5728Python\u4e2d\u91cd\u542ffor\u5faa\u73af\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u5982\u679c\u60f3\u8981\u4ece\u5934\u5f00\u59cb\u6267\u884c\u4e00\u4e2afor\u5faa\u73af\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e2a\u51fd\u6570\u6765\u5c01\u88c5\u5faa\u73af\u4f53\uff0c\u7136\u540e\u5728\u9700\u8981\u7684\u65f6\u5019\u8c03\u7528\u8fd9\u4e2a\u51fd\u6570\u3002\u53e6\u4e00\u79cd\u65b9\u5f0f\u662f\u4f7f\u7528while\u5faa\u73af\u66ff\u4ee3for\u5faa\u73af\uff0c\u8fd9\u6837\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6e\u5faa\u73af\u53d8\u91cf\u6765\u63a7\u5236\u5faa\u73af\u7684\u91cd\u542f\u3002\u5177\u4f53\u5b9e\u73b0\u65b9\u5f0f\u53ef\u4ee5\u6839\u636e\u60a8\u7684\u9700\u6c42\u8fdb\u884c\u9009\u62e9\u3002<\/p>\n
Python\u4e2d\u662f\u5426\u6709\u5faa\u73af\u91cd\u542f\u7684\u5185\u5efa\u65b9\u6cd5\uff1f<\/strong>
Python\u6ca1\u6709\u5185\u5efa\u7684\u65b9\u6cd5\u6765\u76f4\u63a5\u91cd\u542ffor\u5faa\u73af\uff0c\u4f46\u53ef\u4ee5\u901a\u8fc7\u5b9a\u4e49\u4e00\u4e2a\u63a7\u5236\u7ed3\u6784\uff0c\u5982\u51fd\u6570\u6216while\u5faa\u73af\uff0c\u6765\u5b9e\u73b0\u7c7b\u4f3c\u7684\u6548\u679c\u3002\u4f7f\u7528\u51fd\u6570\u53ef\u4ee5\u5c06\u5faa\u73af\u903b\u8f91\u5c01\u88c5\u8d77\u6765\uff0c\u4fbf\u4e8e\u5728\u9700\u8981\u65f6\u8c03\u7528\u3002\u901a\u8fc7while\u5faa\u73af\uff0c\u60a8\u53ef\u4ee5\u7075\u6d3b\u63a7\u5236\u5faa\u73af\u7684\u5f00\u59cb\u548c\u7ed3\u675f\u6761\u4ef6\uff0c\u4ece\u800c\u5b9e\u73b0\u91cd\u542f\u3002<\/p>\n
\u5728Python\u4e2d\u5982\u4f55\u5904\u7406\u5faa\u73af\u4e2d\u7684\u5f02\u5e38\uff0c\u786e\u4fdd\u53ef\u4ee5\u91cd\u65b0\u5f00\u59cb\uff1f<\/strong>
\u5904\u7406\u5faa\u73af\u4e2d\u7684\u5f02\u5e38\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528try-except\u8bed\u53e5\u6765\u6355\u83b7\u5f02\u5e38\u3002\u5728except\u5757\u4e2d\uff0c\u60a8\u53ef\u4ee5\u9009\u62e9\u91cd\u542f\u5faa\u73af\u3002\u4e3a\u4e86\u66f4\u597d\u5730\u7ba1\u7406\u5faa\u73af\u72b6\u6001\uff0c\u53ef\u4ee5\u5c06\u5faa\u73af\u903b\u8f91\u653e\u5728\u4e00\u4e2a\u51fd\u6570\u5185\uff0c\u4ece\u800c\u5728\u51fa\u73b0\u5f02\u5e38\u65f6\u65b9\u4fbf\u5730\u8c03\u7528\u8be5\u51fd\u6570\u6765\u91cd\u542f\u5faa\u73af\u3002\u8fd9\u6837\u505a\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728 Python \u4e2d\u4f7f for \u5faa\u73af\u4ece\u5934\u5f00\u59cb\u7684\u51e0\u79cd\u65b9\u6cd5\u6709\uff1a\u4f7f\u7528\u5faa\u73af\u5d4c\u5957\u3001\u4f7f\u7528\u9012\u5f52\u51fd\u6570\u3001\u4f7f\u7528 while \u5faa\u73af\u3002 […]","protected":false},"author":3,"featured_media":1105354,"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\/1105345"}],"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=1105345"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1105345\/revisions"}],"predecessor-version":[{"id":1105357,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1105345\/revisions\/1105357"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1105354"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1105345"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1105345"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1105345"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}