{"id":1187384,"date":"2025-01-15T20:04:55","date_gmt":"2025-01-15T12:04:55","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1187384.html"},"modified":"2025-01-15T20:05:00","modified_gmt":"2025-01-15T12:05:00","slug":"python%e5%a6%82%e4%bd%95%e5%88%a4%e6%96%ad%e5%ae%9e%e4%be%8b%e6%98%af%e5%90%a6%e5%ad%98%e5%9c%a8","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1187384.html","title":{"rendered":"python\u5982\u4f55\u5224\u65ad\u5b9e\u4f8b\u662f\u5426\u5b58\u5728"},"content":{"rendered":"

\"python\u5982\u4f55\u5224\u65ad\u5b9e\u4f8b\u662f\u5426\u5b58\u5728\"<\/p>\n

\u5728Python\u4e2d\uff0c\u5224\u65ad\u5b9e\u4f8b\u662f\u5426\u5b58\u5728\u7684\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528isinstance()\u51fd\u6570\u3001type()\u51fd\u6570\u3001try-except\u5757\u7b49\u3002\u4f7f\u7528isinstance()\u51fd\u6570\u662f\u6700\u5e38\u7528\u548c\u63a8\u8350\u7684\u65b9\u6cd5\uff0c\u56e0\u4e3a\u5b83\u4e0d\u4ec5\u53ef\u4ee5\u5224\u65ad\u5b9e\u4f8b\u662f\u5426\u5b58\u5728\uff0c\u8fd8\u53ef\u4ee5\u68c0\u67e5\u5b9e\u4f8b\u7684\u7c7b\u578b\u662f\u5426\u5339\u914d\u3002<\/strong><\/p>\n<\/p>\n

\u4f7f\u7528isinstance()\u51fd\u6570\u53ef\u4ee5\u66f4\u9ad8\u6548\u548c\u51c6\u786e\u5730\u68c0\u67e5\u5b9e\u4f8b\u662f\u5426\u5b58\u5728\u3002\u4f8b\u5982\uff0c\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u81ea\u5b9a\u4e49\u7c7bMyClass\uff0c\u5e76\u4e14\u6211\u4eec\u60f3\u8981\u5224\u65ad\u67d0\u4e2a\u53d8\u91cf\u662f\u5426\u662fMyClass\u7684\u5b9e\u4f8b\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n<\/p>\n

class MyClass:<\/p>\n
    pass<\/p>\n
my_instance = MyClass()<\/p>\n
\u4f7f\u7528isinstance()\u51fd\u6570\u5224\u65ad\u5b9e\u4f8b\u662f\u5426\u5b58\u5728<\/strong><\/h2>\n
if isinstance(my_instance, MyClass):<\/p>\n
    print("\u5b9e\u4f8b\u5b58\u5728\u4e14\u4e3aMyClass\u7c7b\u578b")<\/p>\n
else:<\/p>\n
    print("\u5b9e\u4f8b\u4e0d\u5b58\u5728\u6216\u4e0d\u662fMyClass\u7c7b\u578b")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u9996\u5148\u5b9a\u4e49\u4e86\u4e00\u4e2a\u7c7bMyClass\uff0c\u7136\u540e\u521b\u5efa\u4e86\u4e00\u4e2aMyClass\u7684\u5b9e\u4f8bmy_instance\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u4f7f\u7528isinstance()\u51fd\u6570\u68c0\u67e5my_instance\u662f\u5426\u662fMyClass\u7684\u5b9e\u4f8b\uff0c\u5e76\u6839\u636e\u68c0\u67e5\u7ed3\u679c\u6253\u5370\u76f8\u5e94\u7684\u6d88\u606f\u3002<\/p>\n<\/p>\n
\u4e00\u3001ISINSTANCE()\u51fd\u6570<\/h3>\n<\/p>\n
isinstance()\u51fd\u6570\u662fPython\u4e2d\u7528\u4e8e\u5224\u65ad\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u662f\u6307\u5b9a\u7c7b\u578b\u6216\u7c7b\u7684\u5b9e\u4f8b\u7684\u5185\u5efa\u51fd\u6570\u3002\u5b83\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\uff1a\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u8981\u68c0\u67e5\u7684\u5bf9\u8c61\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u7c7b\u578b\u6216\u7c7b\u3002<\/strong><\/p>\n<\/p>\n
1\u3001\u7528\u6cd5\u548c\u793a\u4f8b<\/h4>\n<\/p>\n
\u4ee5\u4e0b\u662fisinstance()\u51fd\u6570\u7684\u57fa\u672c\u7528\u6cd5\u548c\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
class MyClass:<\/p>\n
    pass<\/p>\n
my_instance = MyClass()<\/p>\n
if isinstance(my_instance, MyClass):<\/p>\n
    print("my_instance\u662fMyClass\u7684\u5b9e\u4f8b")<\/p>\n
else:<\/p>\n
    print("my_instance\u4e0d\u662fMyClass\u7684\u5b9e\u4f8b")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u7c7bMyClass\uff0c\u5e76\u521b\u5efa\u4e86\u4e00\u4e2aMyClass\u7684\u5b9e\u4f8bmy_instance\u3002\u7136\u540e\u6211\u4eec\u4f7f\u7528isinstance()\u51fd\u6570\u68c0\u67e5my_instance\u662f\u5426\u662fMyClass\u7684\u5b9e\u4f8b\uff0c\u5e76\u6839\u636e\u7ed3\u679c\u6253\u5370\u76f8\u5e94\u7684\u6d88\u606f\u3002<\/p>\n<\/p>\n
2\u3001\u68c0\u67e5\u591a\u4e2a\u7c7b\u578b<\/h4>\n<\/p>\n
isinstance()\u51fd\u6570\u8fd8\u53ef\u4ee5\u68c0\u67e5\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u5c5e\u4e8e\u591a\u4e2a\u7c7b\u578b\u4e2d\u7684\u4e00\u79cd\u3002\u7b2c\u4e8c\u4e2a\u53c2\u6570\u53ef\u4ee5\u662f\u4e00\u4e2a\u7c7b\u578b\u5143\u7ec4\uff1a<\/p>\n<\/p>\n
if isinstance(my_instance, (MyClass, AnotherClass)):<\/p>\n
    print("my_instance\u662fMyClass\u6216AnotherClass\u7684\u5b9e\u4f8b")<\/p>\n
else:<\/p>\n
    print("my_instance\u65e2\u4e0d\u662fMyClass\u4e5f\u4e0d\u662fAnotherClass\u7684\u5b9e\u4f8b")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u6837\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u4e00\u4e2a\u68c0\u67e5\u4e2d\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u5c5e\u4e8e\u591a\u4e2a\u7c7b\u578b\u4e2d\u7684\u4e00\u79cd\u3002<\/p>\n<\/p>\n
\u4e8c\u3001TYPE()\u51fd\u6570<\/h3>\n<\/p>\n
type()\u51fd\u6570\u7528\u4e8e\u83b7\u53d6\u5bf9\u8c61\u7684\u7c7b\u578b\u3002\u867d\u7136\u5b83\u4e0d\u5982isinstance()\u51fd\u6570\u7075\u6d3b\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u4e5f\u53ef\u4ee5\u7528\u6765\u5224\u65ad\u5b9e\u4f8b\u662f\u5426\u5b58\u5728\u3002<\/strong><\/p>\n<\/p>\n
1\u3001\u7528\u6cd5\u548c\u793a\u4f8b<\/h4>\n<\/p>\n
\u4ee5\u4e0b\u662ftype()\u51fd\u6570\u7684\u57fa\u672c\u7528\u6cd5\u548c\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
class MyClass:<\/p>\n
    pass<\/p>\n
my_instance = MyClass()<\/p>\n
if type(my_instance) is MyClass:<\/p>\n
    print("my_instance\u662fMyClass\u7684\u5b9e\u4f8b")<\/p>\n
else:<\/p>\n
    print("my_instance\u4e0d\u662fMyClass\u7684\u5b9e\u4f8b")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528type()\u51fd\u6570\u83b7\u53d6my_instance\u7684\u7c7b\u578b\uff0c\u5e76\u5c06\u5176\u4e0eMyClass\u8fdb\u884c\u6bd4\u8f83\u3002\u5982\u679c\u7c7b\u578b\u5339\u914d\uff0c\u5219\u8bf4\u660e\u5b9e\u4f8b\u5b58\u5728\u5e76\u4e14\u662fMyClass\u7684\u5b9e\u4f8b\u3002<\/p>\n<\/p>\n
2\u3001\u7c7b\u578b\u6bd4\u8f83\u7684\u5c40\u9650\u6027<\/h4>\n<\/p>\n
\u4e0eisinstance()\u51fd\u6570\u4e0d\u540c\uff0ctype()\u51fd\u6570\u4e0d\u80fd\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u5c5e\u4e8e\u5b50\u7c7b\u3002\u4ee5\u4e0b\u793a\u4f8b\u8bf4\u660e\u4e86\u8fd9\u79cd\u5c40\u9650\u6027\uff1a<\/p>\n<\/p>\n
class BaseClass:<\/p>\n
    pass<\/p>\n
class SubClass(BaseClass):<\/p>\n
    pass<\/p>\n
sub_instance = SubClass()<\/p>\n
if type(sub_instance) is BaseClass:<\/p>\n
    print("sub_instance\u662fBaseClass\u7684\u5b9e\u4f8b")<\/p>\n
else:<\/p>\n
    print("sub_instance\u4e0d\u662fBaseClass\u7684\u5b9e\u4f8b")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0ctype(sub_instance) is BaseClass\u7684\u6bd4\u8f83\u7ed3\u679c\u4e3aFalse\uff0c\u56e0\u4e3asub_instance\u7684\u7c7b\u578b\u662fSubClass\uff0c\u800c\u4e0d\u662fBaseClass\u3002\u8fd9\u79cd\u5c40\u9650\u6027\u4f7f\u5f97type()\u51fd\u6570\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u4e0d\u5982isinstance()\u51fd\u6570\u7075\u6d3b\u3002<\/p>\n<\/p>\n
\u4e09\u3001TRY-EXCEPT\u5757<\/h3>\n<\/p>\n
try-except\u5757\u662f\u4e00\u79cd\u5f02\u5e38\u5904\u7406\u673a\u5236\uff0c\u53ef\u4ee5\u7528\u6765\u6355\u83b7\u548c\u5904\u7406\u8fd0\u884c\u65f6\u9519\u8bef\u3002\u867d\u7136\u5b83\u4e0d\u662f\u4e13\u95e8\u7528\u4e8e\u5224\u65ad\u5b9e\u4f8b\u662f\u5426\u5b58\u5728\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u53ef\u4ee5\u7528\u6765\u68c0\u67e5\u5bf9\u8c61\u662f\u5426\u5df2\u5b9a\u4e49\u3002<\/strong><\/p>\n<\/p>\n
1\u3001\u7528\u6cd5\u548c\u793a\u4f8b<\/h4>\n<\/p>\n
\u4ee5\u4e0b\u662ftry-except\u5757\u7684\u57fa\u672c\u7528\u6cd5\u548c\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
try:<\/p>\n
    my_instance<\/p>\n
except NameError:<\/p>\n
    print("my_instance\u672a\u5b9a\u4e49")<\/p>\n
else:<\/p>\n
    print("my_instance\u5df2\u5b9a\u4e49")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5c1d\u8bd5\u8bbf\u95eemy_instance\u53d8\u91cf\u3002\u5982\u679cmy_instance\u672a\u5b9a\u4e49\uff0c\u5219\u4f1a\u5f15\u53d1NameError\u5f02\u5e38\uff0c\u6211\u4eec\u5728except\u5757\u4e2d\u6355\u83b7\u8be5\u5f02\u5e38\u5e76\u6253\u5370\u76f8\u5e94\u7684\u6d88\u606f\u3002\u5982\u679cmy_instance\u5df2\u5b9a\u4e49\uff0c\u5219\u4e0d\u4f1a\u5f15\u53d1\u5f02\u5e38\uff0c\u6211\u4eec\u5728else\u5757\u4e2d\u6253\u5370\u76f8\u5e94\u7684\u6d88\u606f\u3002<\/p>\n<\/p>\n
2\u3001\u68c0\u67e5\u591a\u4e2a\u53d8\u91cf<\/h4>\n<\/p>\n
\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528try-except\u5757\u68c0\u67e5\u591a\u4e2a\u53d8\u91cf\u662f\u5426\u5df2\u5b9a\u4e49\uff1a<\/p>\n<\/p>\n
try:<\/p>\n
    my_instance<\/p>\n
    another_instance<\/p>\n
except NameError as e:<\/p>\n
    print(f"{e}\u672a\u5b9a\u4e49")<\/p>\n
else:<\/p>\n
    print("\u6240\u6709\u53d8\u91cf\u5747\u5df2\u5b9a\u4e49")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5c1d\u8bd5\u8bbf\u95eemy_instance\u548canother_instance\u53d8\u91cf\u3002\u5982\u679c\u5176\u4e2d\u4efb\u4f55\u4e00\u4e2a\u672a\u5b9a\u4e49\uff0c\u5219\u4f1a\u5f15\u53d1NameError\u5f02\u5e38\uff0c\u6211\u4eec\u5728except\u5757\u4e2d\u6355\u83b7\u8be5\u5f02\u5e38\u5e76\u6253\u5370\u76f8\u5e94\u7684\u6d88\u606f\u3002\u5982\u679c\u6240\u6709\u53d8\u91cf\u5747\u5df2\u5b9a\u4e49\uff0c\u5219\u4e0d\u4f1a\u5f15\u53d1\u5f02\u5e38\uff0c\u6211\u4eec\u5728else\u5757\u4e2d\u6253\u5370\u76f8\u5e94\u7684\u6d88\u606f\u3002<\/p>\n<\/p>\n
\u56db\u3001\u5e38\u89c1\u7528\u4f8b\u548c\u6ce8\u610f\u4e8b\u9879<\/h3>\n<\/p>\n
\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u5224\u65ad\u5b9e\u4f8b\u662f\u5426\u5b58\u5728\u7684\u9700\u6c42\u53ef\u80fd\u4f1a\u51fa\u73b0\u5728\u5404\u79cd\u573a\u666f\u4e2d\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u89c1\u7684\u7528\u4f8b\u548c\u6ce8\u610f\u4e8b\u9879\uff1a<\/strong><\/p>\n<\/p>\n
1\u3001\u52a8\u6001\u521b\u5efa\u5b9e\u4f8b<\/h4>\n<\/p>\n
\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u5b9e\u4f8b\u53ef\u80fd\u662f\u52a8\u6001\u521b\u5efa\u7684\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528isinstance()\u51fd\u6570\u6216type()\u51fd\u6570\u6765\u68c0\u67e5\u8fd9\u4e9b\u5b9e\u4f8b\u662f\u5426\u5b58\u5728\uff0c\u5e76\u6267\u884c\u76f8\u5e94\u7684\u64cd\u4f5c\uff1a<\/p>\n<\/p>\n
class MyClass:<\/p>\n
    pass<\/p>\n
instances = {}<\/p>\n
\u52a8\u6001\u521b\u5efa\u5b9e\u4f8b<\/strong><\/h2>\n
for i in range(5):<\/p>\n
    instances[f"instance_{i}"] = MyClass()<\/p>\n
\u68c0\u67e5\u5b9e\u4f8b\u662f\u5426\u5b58\u5728<\/strong><\/h2>\n
for key, instance in instances.items():<\/p>\n
    if isinstance(instance, MyClass):<\/p>\n
        print(f"{key}\u662fMyClass\u7684\u5b9e\u4f8b")<\/p>\n
    else:<\/p>\n
        print(f"{key}\u4e0d\u662fMyClass\u7684\u5b9e\u4f8b")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u52a8\u6001\u521b\u5efa\u4e865\u4e2aMyClass\u7684\u5b9e\u4f8b\uff0c\u5e76\u5b58\u50a8\u5728\u4e00\u4e2a\u5b57\u5178\u4e2d\u3002\u7136\u540e\u6211\u4eec\u4f7f\u7528isinstance()\u51fd\u6570\u68c0\u67e5\u8fd9\u4e9b\u5b9e\u4f8b\u662f\u5426\u5b58\u5728\uff0c\u5e76\u6839\u636e\u68c0\u67e5\u7ed3\u679c\u6253\u5370\u76f8\u5e94\u7684\u6d88\u606f\u3002<\/p>\n<\/p>\n
2\u3001\u5904\u7406\u4e0d\u540c\u7c7b\u578b\u7684\u5bf9\u8c61<\/h4>\n<\/p>\n
\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u5904\u7406\u4e0d\u540c\u7c7b\u578b\u7684\u5bf9\u8c61\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528isinstance()\u51fd\u6570\u68c0\u67e5\u5bf9\u8c61\u7684\u7c7b\u578b\uff0c\u5e76\u6267\u884c\u76f8\u5e94\u7684\u64cd\u4f5c\uff1a<\/p>\n<\/p>\n
class MyClass:<\/p>\n
    pass<\/p>\n
class AnotherClass:<\/p>\n
    pass<\/p>\n
instances = [MyClass(), AnotherClass(), "string", 123]<\/p>\n
\u5904\u7406\u4e0d\u540c\u7c7b\u578b\u7684\u5bf9\u8c61<\/strong><\/h2>\n
for instance in instances:<\/p>\n
    if isinstance(instance, MyClass):<\/p>\n
        print("\u8fd9\u662fMyClass\u7684\u5b9e\u4f8b")<\/p>\n
    elif isinstance(instance, AnotherClass):<\/p>\n
        print("\u8fd9\u662fAnotherClass\u7684\u5b9e\u4f8b")<\/p>\n
    else:<\/p>\n
        print("\u8fd9\u662f\u5176\u4ed6\u7c7b\u578b\u7684\u5bf9\u8c61")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a\u5305\u542b\u4e0d\u540c\u7c7b\u578b\u5bf9\u8c61\u7684\u5217\u8868\uff0c\u5e76\u4f7f\u7528isinstance()\u51fd\u6570\u68c0\u67e5\u6bcf\u4e2a\u5bf9\u8c61\u7684\u7c7b\u578b\uff0c\u7136\u540e\u6839\u636e\u7c7b\u578b\u6267\u884c\u76f8\u5e94\u7684\u64cd\u4f5c\u3002<\/p>\n<\/p>\n
3\u3001\u6ce8\u610f\u4e8b\u9879<\/h4>\n<\/p>\n
\u5728\u4f7f\u7528isinstance()\u51fd\u6570\u548ctype()\u51fd\u6570\u65f6\uff0c\u6709\u4e00\u4e9b\u6ce8\u610f\u4e8b\u9879\u9700\u8981\u8bb0\u4f4f\uff1a<\/p>\n<\/p>\n
    \n
  • isinstance()\u51fd\u6570\u53ef\u4ee5\u68c0\u67e5\u5b50\u7c7b\uff0c\u800ctype()\u51fd\u6570\u4e0d\u80fd\u3002<\/strong> \u56e0\u6b64\uff0c\u5728\u9700\u8981\u68c0\u67e5\u5b50\u7c7b\u7684\u60c5\u51b5\u4e0b\uff0c\u5e94\u8be5\u4f7f\u7528isinstance()\u51fd\u6570\u3002<\/li>\n
  • type()\u51fd\u6570\u8fd4\u56de\u7684\u662f\u5bf9\u8c61\u7684\u5b9e\u9645\u7c7b\u578b\uff0c\u800cisinstance()\u51fd\u6570\u68c0\u67e5\u7684\u662f\u5bf9\u8c61\u662f\u5426\u5c5e\u4e8e\u6307\u5b9a\u7c7b\u578b\u6216\u5176\u5b50\u7c7b\u3002<\/strong> \u8fd9\u4f7f\u5f97isinstance()\u51fd\u6570\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u66f4\u52a0\u7075\u6d3b\u548c\u9002\u7528\u3002<\/li>\n
  • \u4f7f\u7528try-except\u5757\u68c0\u67e5\u53d8\u91cf\u662f\u5426\u5df2\u5b9a\u4e49\u65f6\uff0c\u5e94\u8be5\u5c3d\u91cf\u907f\u514d\u5728except\u5757\u4e2d\u6267\u884c\u8fc7\u591a\u64cd\u4f5c\u3002<\/strong> \u8fd9\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4ee3\u7801\u96be\u4ee5\u7ef4\u62a4\u548c\u8c03\u8bd5\u3002\u6700\u597d\u5728except\u5757\u4e2d\u53ea\u5904\u7406\u53d8\u91cf\u672a\u5b9a\u4e49\u7684\u60c5\u51b5\uff0c\u5e76\u5728else\u5757\u4e2d\u6267\u884c\u4e3b\u8981\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n
    \u4e94\u3001\u603b\u7ed3<\/h3>\n<\/p>\n
    \u5728Python\u4e2d\uff0c\u5224\u65ad\u5b9e\u4f8b\u662f\u5426\u5b58\u5728\u7684\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528isinstance()\u51fd\u6570\u3001type()\u51fd\u6570\u548ctry-except\u5757\u3002\u4f7f\u7528isinstance()\u51fd\u6570\u662f\u6700\u5e38\u7528\u548c\u63a8\u8350\u7684\u65b9\u6cd5\uff0c\u56e0\u4e3a\u5b83\u4e0d\u4ec5\u53ef\u4ee5\u5224\u65ad\u5b9e\u4f8b\u662f\u5426\u5b58\u5728\uff0c\u8fd8\u53ef\u4ee5\u68c0\u67e5\u5b9e\u4f8b\u7684\u7c7b\u578b\u662f\u5426\u5339\u914d\u3002<\/strong> type()\u51fd\u6570\u53ef\u4ee5\u7528\u6765\u83b7\u53d6\u5bf9\u8c61\u7684\u5b9e\u9645\u7c7b\u578b\uff0c\u4f46\u5728\u68c0\u67e5\u5b50\u7c7b\u65f6\u4e0d\u5982isinstance()\u51fd\u6570\u7075\u6d3b\u3002try-except\u5757\u53ef\u4ee5\u7528\u6765\u68c0\u67e5\u53d8\u91cf\u662f\u5426\u5df2\u5b9a\u4e49\uff0c\u4f46\u5e94\u5c3d\u91cf\u907f\u514d\u5728except\u5757\u4e2d\u6267\u884c\u8fc7\u591a\u64cd\u4f5c\u3002<\/p>\n<\/p>\n
    \u901a\u8fc7\u4e86\u89e3\u8fd9\u4e9b\u65b9\u6cd5\u7684\u7528\u6cd5\u548c\u6ce8\u610f\u4e8b\u9879\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u7075\u6d3b\u5730\u5224\u65ad\u5b9e\u4f8b\u662f\u5426\u5b58\u5728\uff0c\u5e76\u6839\u636e\u9700\u8981\u6267\u884c\u76f8\u5e94\u7684\u64cd\u4f5c\u3002\u8fd9\u5c06\u6709\u52a9\u4e8e\u63d0\u9ad8\u4ee3\u7801\u7684\u5065\u58ee\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n<\/p>\n
    \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
     \u5982\u4f55\u5728Python\u4e2d\u68c0\u67e5\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u5b58\u5728\uff1f<\/strong>
    \u5728Python\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528isinstance()<\/code>\u51fd\u6570\u6765\u5224\u65ad\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u5b58\u5728\u5e76\u4e14\u662f\u67d0\u4e2a\u7279\u5b9a\u7c7b\u578b\u7684\u5b9e\u4f8b\u3002\u4f8b\u5982\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528isinstance(obj, YourClass)<\/code>\u6765\u68c0\u67e5obj<\/code>\u662f\u5426\u662fYourClass<\/code>\u7c7b\u7684\u5b9e\u4f8b\u3002\u5982\u679c\u5bf9\u8c61\u4e3aNone<\/code>\uff0c\u5219\u53ef\u4ee5\u76f4\u63a5\u901a\u8fc7if obj is not None:<\/code>\u8bed\u53e5\u6765\u5224\u65ad\u5176\u5b58\u5728\u6027\u3002<\/p>\n
    Python\u4e2d\u5982\u4f55\u5904\u7406\u672a\u5b9a\u4e49\u7684\u5b9e\u4f8b\uff1f<\/strong>
    \u5728Python\u4e2d\uff0c\u672a\u5b9a\u4e49\u7684\u5b9e\u4f8b\u901a\u5e38\u4f1a\u5bfc\u81f4NameError<\/code>\u3002\u4e3a\u4e86\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528try...except<\/code>\u8bed\u53e5\u6765\u6355\u83b7\u5f02\u5e38\u3002\u5982\u679c\u60a8\u60f3\u8981\u68c0\u67e5\u4e00\u4e2a\u53ef\u80fd\u672a\u5b9a\u4e49\u7684\u53d8\u91cf\uff0c\u53ef\u4ee5\u4f7f\u7528locals()<\/code>\u6216globals()<\/code>\u51fd\u6570\u6765\u786e\u8ba4\u5b83\u662f\u5426\u5728\u5f53\u524d\u4f5c\u7528\u57df\u4e2d\u5b9a\u4e49\u3002<\/p>\n
    \u80fd\u5426\u901a\u8fc7\u5c5e\u6027\u68c0\u67e5\u6765\u5224\u65ad\u5b9e\u4f8b\u662f\u5426\u5b58\u5728\uff1f<\/strong>
    \u662f\u7684\uff0c\u60a8\u53ef\u4ee5\u901a\u8fc7\u68c0\u67e5\u5b9e\u4f8b\u7684\u67d0\u4e2a\u7279\u5b9a\u5c5e\u6027\u662f\u5426\u5b58\u5728\u6765\u5224\u65ad\u5b9e\u4f8b\u662f\u5426\u53ef\u7528\u3002\u4f8b\u5982\uff0c\u4f7f\u7528hasattr(instance, 'attribute_name')<\/code>\u53ef\u4ee5\u68c0\u67e5instance<\/code>\u662f\u5426\u5305\u542battribute_name<\/code>\u5c5e\u6027\u3002\u5982\u679c\u5c5e\u6027\u5b58\u5728\uff0c\u5219\u5b9e\u4f8b\u88ab\u8ba4\u4e3a\u662f\u6709\u6548\u7684\uff0c\u53cd\u4e4b\u5219\u53ef\u80fd\u662f\u672a\u5b9a\u4e49\u6216\u4e0d\u5b58\u5728\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\uff0c\u5224\u65ad\u5b9e\u4f8b\u662f\u5426\u5b58\u5728\u7684\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528isinstance()\u51fd\u6570\u3001type()\u51fd\u6570\u3001try-exc […]","protected":false},"author":3,"featured_media":1187398,"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\/1187384"}],"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=1187384"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1187384\/revisions"}],"predecessor-version":[{"id":1187399,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1187384\/revisions\/1187399"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1187398"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1187384"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1187384"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1187384"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}