{"id":1167920,"date":"2025-01-15T15:51:44","date_gmt":"2025-01-15T07:51:44","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1167920.html"},"modified":"2025-01-15T15:51:47","modified_gmt":"2025-01-15T07:51:47","slug":"%e5%a6%82%e4%bd%95%e5%88%a4%e6%96%ad%e5%85%83%e7%b4%a0%e4%b8%ba%e7%a9%bapython","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1167920.html","title":{"rendered":"\u5982\u4f55\u5224\u65ad\u5143\u7d20\u4e3a\u7a7apython"},"content":{"rendered":"

\"\u5982\u4f55\u5224\u65ad\u5143\u7d20\u4e3a\u7a7apython\"<\/p>\n

\u5224\u65ad\u5143\u7d20\u4e3a\u7a7a\u5728Python\u4e2d\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u5b9e\u73b0\uff0c\u5305\u62ec\u4f7f\u7528\u5e03\u5c14\u503c\u5224\u65ad\u3001len()\u51fd\u6570\u3001is None\u5224\u65ad\u7b49\u65b9\u6cd5\u3002<\/strong> <\/p>\n<\/p>\n

\u5e03\u5c14\u503c\u5224\u65ad<\/strong>\u662f\u6700\u5e38\u89c1\u7684\u65b9\u6cd5\u4e4b\u4e00\u3002Python\u4e2d\u7684\u7a7a\u5143\u7d20\uff08\u5982\u7a7a\u5b57\u7b26\u4e32\u3001\u7a7a\u5217\u8868\u3001\u7a7a\u5b57\u5178\u3001\u7a7a\u5143\u7ec4\u7b49\uff09\u5728\u5e03\u5c14\u4e0a\u4e0b\u6587\u4e2d\u90fd\u88ab\u89c6\u4e3aFalse\u3002\u4f8b\u5982\uff0c\u4f60\u53ef\u4ee5\u76f4\u63a5\u5728if\u6761\u4ef6\u8bed\u53e5\u4e2d\u68c0\u67e5\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\uff1aif not element:<\/code>\u3002<\/p>\n<\/p>\n

\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u8be6\u7ec6\u63cf\u8ff0\u5e03\u5c14\u503c\u5224\u65ad<\/strong>\u65b9\u6cd5\u3002\u5e03\u5c14\u503c\u5224\u65ad\u5229\u7528Python\u4e2d\u7a7a\u5143\u7d20\u5728\u5e03\u5c14\u4e0a\u4e0b\u6587\u4e2d\u88ab\u89c6\u4e3aFalse\u7684\u7279\u6027\u3002\u901a\u8fc7if not element<\/code>\u8bed\u53e5\uff0c\u53ef\u4ee5\u5224\u65ad\u53d8\u91cf\u662f\u5426\u4e3a\u7a7a\u3002\u6b64\u65b9\u6cd5\u9002\u7528\u4e8e\u5404\u79cd\u6570\u636e\u7c7b\u578b\uff0c\u5305\u62ec\u5b57\u7b26\u4e32\u3001\u5217\u8868\u3001\u5b57\u5178\u3001\u5143\u7ec4\u7b49\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n

element = ""<\/p>\n
if not element:<\/p>\n
    print("\u5143\u7d20\u4e3a\u7a7a")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u7b80\u5355\u76f4\u63a5\uff0c\u4ee3\u7801\u53ef\u8bfb\u6027\u9ad8\uff0c\u9002\u7528\u4e8e\u5927\u591a\u6570\u60c5\u51b5\u3002<\/p>\n<\/p>\n
\n
\u4e00\u3001\u5e03\u5c14\u503c\u5224\u65ad<\/h3>\n<\/p>\n
\u5e03\u5c14\u503c\u5224\u65ad\u662f\u5224\u65ad\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\u7684\u6700\u76f4\u63a5\u65b9\u5f0f\u3002Python\u4e2d\u7684\u7a7a\u5143\u7d20\uff08\u5982\u7a7a\u5b57\u7b26\u4e32\u3001\u7a7a\u5217\u8868\u3001\u7a7a\u5b57\u5178\u3001\u7a7a\u5143\u7ec4\u7b49\uff09\u5728\u5e03\u5c14\u4e0a\u4e0b\u6587\u4e2d\u90fd\u88ab\u89c6\u4e3aFalse\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528\u5e03\u5c14\u503c\u5224\u65ad\u7684\u4f8b\u5b50\uff1a<\/p>\n<\/p>\n
1. \u7a7a\u5b57\u7b26\u4e32<\/h4>\n<\/p>\n
element = ""<\/p>\n
if not element:<\/p>\n
    print("\u5143\u7d20\u4e3a\u7a7a")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u7a7a\u5b57\u7b26\u4e32\u5728\u5e03\u5c14\u4e0a\u4e0b\u6587\u4e2d\u88ab\u89c6\u4e3aFalse\uff0c\u56e0\u6b64if not element<\/code>\u6761\u4ef6\u4e3aTrue\uff0c\u6253\u5370\u201c\u5143\u7d20\u4e3a\u7a7a\u201d\u3002<\/p>\n<\/p>\n
2. \u7a7a\u5217\u8868<\/h4>\n<\/p>\n
element = []<\/p>\n
if not element:<\/p>\n
    print("\u5143\u7d20\u4e3a\u7a7a")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u540c\u7406\uff0c\u7a7a\u5217\u8868\u5728\u5e03\u5c14\u4e0a\u4e0b\u6587\u4e2d\u4e5f\u88ab\u89c6\u4e3aFalse\u3002<\/p>\n<\/p>\n
3. \u7a7a\u5b57\u5178<\/h4>\n<\/p>\n
element = {}<\/p>\n
if not element:<\/p>\n
    print("\u5143\u7d20\u4e3a\u7a7a")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u7a7a\u5b57\u5178\u5728\u5e03\u5c14\u4e0a\u4e0b\u6587\u4e2d\u88ab\u89c6\u4e3aFalse\uff0c\u56e0\u6b64\u53ef\u4ee5\u4f7f\u7528\u76f8\u540c\u7684\u65b9\u6cd5\u8fdb\u884c\u5224\u65ad\u3002<\/p>\n<\/p>\n
4. \u7a7a\u5143\u7ec4<\/h4>\n<\/p>\n
element = ()<\/p>\n
if not element:<\/p>\n
    print("\u5143\u7d20\u4e3a\u7a7a")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u7a7a\u5143\u7ec4\u5728\u5e03\u5c14\u4e0a\u4e0b\u6587\u4e2d\u4e5f\u88ab\u89c6\u4e3aFalse\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528len()\u51fd\u6570<\/h3>\n<\/p>\n
\u901a\u8fc7len()\u51fd\u6570\u5224\u65ad\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\u4e5f\u662f\u4e00\u79cd\u5e38\u89c1\u7684\u65b9\u6cd5\u3002len()\u51fd\u6570\u8fd4\u56de\u5bf9\u8c61\u7684\u957f\u5ea6\uff0c\u5982\u679c\u5bf9\u8c61\u4e3a\u7a7a\uff0c\u5219\u8fd4\u56de0\u3002\u6211\u4eec\u53ef\u4ee5\u5229\u7528\u8fd9\u4e00\u70b9\u6765\u5224\u65ad\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\uff1a<\/p>\n<\/p>\n
1. \u7a7a\u5b57\u7b26\u4e32<\/h4>\n<\/p>\n
element = ""<\/p>\n
if len(element) == 0:<\/p>\n
    print("\u5143\u7d20\u4e3a\u7a7a")<\/p>\n
<\/code><\/pre>\n<\/p>\n
2. \u7a7a\u5217\u8868<\/h4>\n<\/p>\n
element = []<\/p>\n
if len(element) == 0:<\/p>\n
    print("\u5143\u7d20\u4e3a\u7a7a")<\/p>\n
<\/code><\/pre>\n<\/p>\n
3. \u7a7a\u5b57\u5178<\/h4>\n<\/p>\n
element = {}<\/p>\n
if len(element) == 0:<\/p>\n
    print("\u5143\u7d20\u4e3a\u7a7a")<\/p>\n
<\/code><\/pre>\n<\/p>\n
4. \u7a7a\u5143\u7ec4<\/h4>\n<\/p>\n
element = ()<\/p>\n
if len(element) == 0:<\/p>\n
    print("\u5143\u7d20\u4e3a\u7a7a")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e09\u3001is None\u5224\u65ad<\/h3>\n<\/p>\n
\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u53d8\u91cf\u53ef\u80fd\u88ab\u8bbe\u7f6e\u4e3aNone\u6765\u8868\u793a\u7a7a\u503c\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528is None\u6765\u5224\u65ad\u53d8\u91cf\u662f\u5426\u4e3a\u7a7a\uff1a<\/p>\n<\/p>\n
element = None<\/p>\n
if element is None:<\/p>\n
    print("\u5143\u7d20\u4e3a\u7a7a")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u90a3\u4e9b\u660e\u786e\u4f7f\u7528None\u6765\u8868\u793a\u7a7a\u503c\u7684\u60c5\u51b5\u3002\u4f8b\u5982\uff0c\u5728\u51fd\u6570\u8fd4\u56de\u503c\u53ef\u80fd\u4e3a\u7a7a\u7684\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u4f7f\u7528is None\u8fdb\u884c\u5224\u65ad\uff1a<\/p>\n<\/p>\n
def get_value():<\/p>\n
    return None<\/p>\n
element = get_value()<\/p>\n
if element is None:<\/p>\n
    print("\u5143\u7d20\u4e3a\u7a7a")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u56db\u3001\u7ed3\u5408\u591a\u79cd\u65b9\u6cd5<\/h3>\n<\/p>\n
\u5728\u5b9e\u9645\u7f16\u7a0b\u4e2d\uff0c\u6709\u65f6\u6211\u4eec\u9700\u8981\u7ed3\u5408\u591a\u79cd\u65b9\u6cd5\u6765\u5224\u65ad\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\u3002\u4f8b\u5982\uff0c\u68c0\u67e5\u53d8\u91cf\u662f\u5426\u4e3aNone\u6216\u7a7a\u5b57\u7b26\u4e32\uff1a<\/p>\n<\/p>\n
element = ""<\/p>\n
if element is None or element == "":<\/p>\n
    print("\u5143\u7d20\u4e3a\u7a7a")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u53c8\u6216\u8005\uff0c\u68c0\u67e5\u53d8\u91cf\u662f\u5426\u4e3aNone\u6216\u7a7a\u5217\u8868\uff1a<\/p>\n<\/p>\n
element = []<\/p>\n
if element is None or len(element) == 0:<\/p>\n
    print("\u5143\u7d20\u4e3a\u7a7a")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u786e\u4fdd\u5728\u4e0d\u540c\u60c5\u51b5\u4e0b\u90fd\u80fd\u6b63\u786e\u5224\u65ad\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u81ea\u5b9a\u4e49\u51fd\u6570<\/h3>\n<\/p>\n
\u4e3a\u4e86\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u590d\u7528\u6027\uff0c\u6211\u4eec\u53ef\u4ee5\u7f16\u5199\u4e00\u4e2a\u81ea\u5b9a\u4e49\u51fd\u6570\u6765\u5224\u65ad\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\uff1a<\/p>\n<\/p>\n
def is_empty(element):<\/p>\n
    if element is None:<\/p>\n
        return True<\/p>\n
    if isinstance(element, (str, list, dict, tuple)):<\/p>\n
        return len(element) == 0<\/p>\n
    return False<\/p>\n
\u4f7f\u7528\u81ea\u5b9a\u4e49\u51fd\u6570<\/strong><\/h2>\n
element = ""<\/p>\n
if is_empty(element):<\/p>\n
    print("\u5143\u7d20\u4e3a\u7a7a")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u4e2a\u81ea\u5b9a\u4e49\u51fd\u6570\u53ef\u4ee5\u5904\u7406\u591a\u79cd\u6570\u636e\u7c7b\u578b\uff0c\u5e76\u6839\u636e\u4e0d\u540c\u7684\u60c5\u51b5\u8fd4\u56de\u662f\u5426\u4e3a\u7a7a\u7684\u5224\u65ad\u7ed3\u679c\u3002<\/p>\n<\/p>\n
\u516d\u3001\u5e94\u7528\u573a\u666f<\/h3>\n<\/p>\n
\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\uff0c\u5224\u65ad\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\u662f\u4e00\u4e2a\u5e38\u89c1\u7684\u9700\u6c42\u3002\u4f8b\u5982\uff0c\u5728\u6570\u636e\u5904\u7406\u3001Web\u5f00\u53d1\u3001\u7528\u6237\u8f93\u5165\u9a8c\u8bc1\u7b49\u573a\u666f\u4e2d\uff0c\u90fd\u9700\u8981\u5224\u65ad\u8f93\u5165\u6216\u6570\u636e\u662f\u5426\u4e3a\u7a7a\u3002<\/p>\n<\/p>\n
1. \u6570\u636e\u5904\u7406<\/h4>\n<\/p>\n
\u5728\u6570\u636e\u5904\u7406\u8fc7\u7a0b\u4e2d\uff0c\u9700\u8981\u5224\u65ad\u6570\u636e\u662f\u5426\u4e3a\u7a7a\uff0c\u4ee5\u907f\u514d\u5728\u540e\u7eed\u5904\u7406\u4e2d\u51fa\u73b0\u9519\u8bef\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
data = get_data()<\/p>\n
if not data:<\/p>\n
    print("\u6570\u636e\u4e3a\u7a7a\uff0c\u65e0\u6cd5\u5904\u7406")<\/p>\n
else:<\/p>\n
    process_data(data)<\/p>\n
<\/code><\/pre>\n<\/p>\n
2. Web\u5f00\u53d1<\/h4>\n<\/p>\n
\u5728Web\u5f00\u53d1\u4e2d\uff0c\u9700\u8981\u9a8c\u8bc1\u7528\u6237\u8f93\u5165\u662f\u5426\u4e3a\u7a7a\uff0c\u4ee5\u786e\u4fdd\u7528\u6237\u63d0\u4ea4\u7684\u6570\u636e\u7b26\u5408\u8981\u6c42\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
username = request.form.get("username")<\/p>\n
if not username:<\/p>\n
    return "\u7528\u6237\u540d\u4e0d\u80fd\u4e3a\u7a7a"<\/p>\n
<\/code><\/pre>\n<\/p>\n
3. \u7528\u6237\u8f93\u5165\u9a8c\u8bc1<\/h4>\n<\/p>\n
\u5728\u7528\u6237\u8f93\u5165\u9a8c\u8bc1\u4e2d\uff0c\u9700\u8981\u5224\u65ad\u7528\u6237\u8f93\u5165\u7684\u503c\u662f\u5426\u4e3a\u7a7a\uff0c\u4ee5\u786e\u4fdd\u7528\u6237\u8f93\u5165\u7684\u5185\u5bb9\u7b26\u5408\u8981\u6c42\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
def validate_input(input_value):<\/p>\n
    if not input_value:<\/p>\n
        return False, "\u8f93\u5165\u4e0d\u80fd\u4e3a\u7a7a"<\/p>\n
    return True, "\u8f93\u5165\u6709\u6548"<\/p>\n
input_value = " "<\/p>\n
is_valid, message = validate_input(input_value)<\/p>\n
print(message)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e03\u3001\u5e38\u89c1\u9519\u8bef<\/h3>\n<\/p>\n
\u5728\u5224\u65ad\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\u65f6\uff0c\u6709\u4e00\u4e9b\u5e38\u89c1\u7684\u9519\u8bef\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<\/p>\n
1. \u6df7\u6dc6None\u548c\u7a7a\u503c<\/h4>\n<\/p>\n
None\u548c\u7a7a\u503c\uff08\u5982\u7a7a\u5b57\u7b26\u4e32\u3001\u7a7a\u5217\u8868\u7b49\uff09\u662f\u4e0d\u540c\u7684\u6982\u5ff5\u3002\u5728\u5224\u65ad\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\u65f6\uff0c\u9700\u8981\u660e\u786e\u533a\u5206\u8fd9\u4e24\u8005\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
element = None<\/p>\n
if element is None:<\/p>\n
    print("\u5143\u7d20\u4e3aNone")<\/p>\n
element = ""<\/p>\n
if not element:<\/p>\n
    print("\u5143\u7d20\u4e3a\u7a7a")<\/p>\n
<\/code><\/pre>\n<\/p>\n
2. \u8bef\u7528len()\u51fd\u6570<\/h4>\n<\/p>\n
len()\u51fd\u6570\u53ea\u80fd\u7528\u4e8e\u5177\u6709\u957f\u5ea6\u5c5e\u6027\u7684\u5bf9\u8c61\uff0c\u5982\u5b57\u7b26\u4e32\u3001\u5217\u8868\u3001\u5b57\u5178\u3001\u5143\u7ec4\u7b49\u3002\u5982\u679c\u8bef\u7528len()\u51fd\u6570\u5224\u65ad\u5176\u4ed6\u7c7b\u578b\u7684\u5bf9\u8c61\uff0c\u4f1a\u5bfc\u81f4\u9519\u8bef\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
element = 123<\/p>\n
if len(element) == 0:  # \u4f1a\u5bfc\u81f4TypeError<\/p>\n
    print("\u5143\u7d20\u4e3a\u7a7a")<\/p>\n
<\/code><\/pre>\n<\/p>\n
3. \u5ffd\u7565\u7a7a\u767d\u5b57\u7b26\u4e32<\/h4>\n<\/p>\n
\u5728\u5224\u65ad\u5b57\u7b26\u4e32\u662f\u5426\u4e3a\u7a7a\u65f6\uff0c\u9700\u8981\u8003\u8651\u7a7a\u767d\u5b57\u7b26\u4e32\u7684\u60c5\u51b5\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
element = " "<\/p>\n
if not element.strip():<\/p>\n
    print("\u5143\u7d20\u4e3a\u7a7a")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u516b\u3001\u603b\u7ed3<\/h3>\n<\/p>\n
\u5224\u65ad\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\u662fPython\u7f16\u7a0b\u4e2d\u7684\u4e00\u4e2a\u57fa\u672c\u4e14\u91cd\u8981\u7684\u64cd\u4f5c\u3002\u53ef\u4ee5\u901a\u8fc7\u5e03\u5c14\u503c\u5224\u65ad\u3001len()\u51fd\u6570\u3001is None\u5224\u65ad\u7b49\u65b9\u6cd5\u6765\u5b9e\u73b0\u8fd9\u4e00\u64cd\u4f5c\u3002\u4e3a\u4e86\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u590d\u7528\u6027\uff0c\u53ef\u4ee5\u7f16\u5199\u81ea\u5b9a\u4e49\u51fd\u6570\u6765\u5904\u7406\u4e0d\u540c\u7684\u6570\u636e\u7c7b\u578b\u548c\u60c5\u51b5\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u9700\u8981\u6839\u636e\u5177\u4f53\u60c5\u51b5\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\uff0c\u5e76\u6ce8\u610f\u907f\u514d\u5e38\u89c1\u7684\u9519\u8bef\u3002<\/p>\n<\/p>\n
\u901a\u8fc7\u638c\u63e1\u8fd9\u4e9b\u65b9\u6cd5\u548c\u6280\u5de7\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u5224\u65ad\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\uff0c\u786e\u4fdd\u4ee3\u7801\u7684\u6b63\u786e\u6027\u548c\u9c81\u68d2\u6027\u3002\u5e0c\u671b\u8fd9\u7bc7\u6587\u7ae0\u80fd\u5bf9\u4f60\u5728Python\u7f16\u7a0b\u4e2d\u5224\u65ad\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\u6709\u6240\u5e2e\u52a9\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u5728Python\u4e2d\u68c0\u67e5\u5217\u8868\u6216\u5b57\u5178\u662f\u5426\u4e3a\u7a7a\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u7b80\u5355\u7684\u6761\u4ef6\u8bed\u53e5\u6765\u68c0\u67e5\u5217\u8868\u6216\u5b57\u5178\u662f\u5426\u4e3a\u7a7a\u3002\u5bf9\u4e8e\u5217\u8868\uff0c\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528if not my_list:<\/code>\u6765\u5224\u65ad\uff1b\u5bf9\u4e8e\u5b57\u5178\uff0c\u4f7f\u7528if not my_dict:<\/code>\u662f\u4e00\u4e2a\u6709\u6548\u7684\u65b9\u6cd5\u3002\u5982\u679c\u8fd9\u4e9b\u7ed3\u6784\u4e3a\u7a7a\uff0c\u6761\u4ef6\u5c06\u4e3a\u771f\u3002<\/p>\n
\u5728Python\u4e2d\uff0c\u7a7a\u5b57\u7b26\u4e32\u548cNone\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/strong>
\u7a7a\u5b57\u7b26\u4e32\uff08""<\/code>\uff09\u8868\u793a\u4e00\u4e2a\u957f\u5ea6\u4e3a\u96f6\u7684\u5b57\u7b26\u4e32\uff0c\u800cNone<\/code>\u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u5bf9\u8c61\uff0c\u8868\u793a\u6ca1\u6709\u503c\u3002\u53ef\u4ee5\u4f7f\u7528if my_string == "":<\/code>\u6765\u5224\u65ad\u5b57\u7b26\u4e32\u662f\u5426\u4e3a\u7a7a\uff0c\u4f7f\u7528if my_variable is None:<\/code>\u6765\u68c0\u67e5\u53d8\u91cf\u662f\u5426\u4e3aNone\u3002\u4e86\u89e3\u8fd9\u4e24\u8005\u7684\u533a\u522b\u6709\u52a9\u4e8e\u5728\u7f16\u7a0b\u65f6\u505a\u51fa\u66f4\u51c6\u786e\u7684\u5224\u65ad\u3002<\/p>\n
\u5982\u4f55\u5728Python\u4e2d\u5904\u7406\u7a7a\u503c\u4ee5\u907f\u514d\u9519\u8bef\uff1f<\/strong>
\u5904\u7406\u7a7a\u503c\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u5f02\u5e38\u5904\u7406\u673a\u5236\u6765\u6355\u83b7\u6f5c\u5728\u7684\u9519\u8bef\u3002\u4f8b\u5982\uff0c\u4f7f\u7528try-except<\/code>\u8bed\u53e5\u5757\u6765\u6355\u83b7\u56e0\u7a7a\u503c\u5f15\u53d1\u7684TypeError<\/code>\u6216ValueError<\/code>\u3002\u6b64\u5916\uff0c\u63d0\u4f9b\u9ed8\u8ba4\u503c\u4e5f\u662f\u4e00\u4e2a\u597d\u65b9\u6cd5\uff0c\u53ef\u4ee5\u901a\u8fc7value = my_variable if my_variable is not None else default_value<\/code>\u6765\u786e\u4fdd\u53d8\u91cf\u5728\u4f7f\u7528\u65f6\u4e0d\u4f1a\u5f15\u53d1\u9519\u8bef\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5224\u65ad\u5143\u7d20\u4e3a\u7a7a\u5728Python\u4e2d\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u5b9e\u73b0\uff0c\u5305\u62ec\u4f7f\u7528\u5e03\u5c14\u503c\u5224\u65ad\u3001len()\u51fd\u6570\u3001is None\u5224\u65ad\u7b49\u65b9\u6cd5 […]","protected":false},"author":3,"featured_media":1167930,"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\/1167920"}],"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=1167920"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1167920\/revisions"}],"predecessor-version":[{"id":1167932,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1167920\/revisions\/1167932"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1167930"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1167920"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1167920"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1167920"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}