{"id":1139964,"date":"2025-01-08T22:15:27","date_gmt":"2025-01-08T14:15:27","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1139964.html"},"modified":"2025-01-08T22:15:30","modified_gmt":"2025-01-08T14:15:30","slug":"python%e4%b8%ad%e5%a6%82%e4%bd%95%e5%b0%86%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%bd%ac%e6%8d%a2%e6%95%b0%e5%80%bc%e5%9e%8b","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1139964.html","title":{"rendered":"python\u4e2d\u5982\u4f55\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u6570\u503c\u578b"},"content":{"rendered":"

\"python\u4e2d\u5982\u4f55\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u6570\u503c\u578b\"<\/p>\n

\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u5185\u7f6e\u51fd\u6570\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6570\u503c\u578b\u3002\u5e38\u7528\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u4e3b\u8981\u5305\u62ec\u4f7f\u7528int()<\/code>\u51fd\u6570\u3001float()<\/code>\u51fd\u6570\u548cdecimal.Decimal()<\/code>\u7c7b\u3002<\/strong> \u5176\u4e2d\uff0c\u6700\u5e38\u89c1\u7684\u662f\u4f7f\u7528int()<\/code>\u548cfloat()<\/code>\u51fd\u6570\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u63a2\u8ba8\u5982\u4f55\u5728Python\u4e2d\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6570\u503c\u578b\uff0c\u5e76\u8ba8\u8bba\u5404\u79cd\u65b9\u6cd5\u7684\u4f18\u7f3a\u70b9\u53ca\u9002\u7528\u573a\u666f\u3002<\/p>\n<\/p>\n

\n

\u4e00\u3001\u4f7f\u7528 int()<\/code> \u51fd\u6570\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6574\u6570<\/strong><\/h2>\n

\u4f7f\u7528 int()<\/code> \u51fd\u6570\u662f\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6574\u6570\u7684\u6700\u76f4\u63a5\u65b9\u6cd5\u3002<\/p>\n<\/p>\n

\u57fa\u672c\u7528\u6cd5<\/h2>\n<\/p>\n

int()<\/code> \u51fd\u6570\u53ef\u4ee5\u5c06\u4e00\u4e2a\u8868\u793a\u6574\u6570\u7684\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u4e00\u4e2a\u6574\u6570\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n

num_str = "123"<\/p>\n
num_int = int(num_str)<\/p>\n
print(num_int)  # \u8f93\u51fa\uff1a123<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5904\u7406\u5e26\u7b26\u53f7\u7684\u5b57\u7b26\u4e32<\/h2>\n<\/p>\n
int()<\/code> \u51fd\u6570\u8fd8\u53ef\u4ee5\u5904\u7406\u5e26\u7b26\u53f7\u7684\u5b57\u7b26\u4e32\uff1a<\/p>\n<\/p>\n
num_str = "-123"<\/p>\n
num_int = int(num_str)<\/p>\n
print(num_int)  # \u8f93\u51fa\uff1a-123<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fdb\u5236\u8f6c\u6362<\/h2>\n<\/p>\n
int()<\/code> \u51fd\u6570\u8fd8\u53ef\u4ee5\u5c06\u4e0d\u540c\u8fdb\u5236\u7684\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5341\u8fdb\u5236\u6574\u6570\uff1a<\/p>\n<\/p>\n
num_str = "1010"<\/p>\n
num_int = int(num_str, 2)  # \u5c06\u4e8c\u8fdb\u5236\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5341\u8fdb\u5236\u6574\u6570<\/p>\n
print(num_int)  # \u8f93\u51fa\uff1a10<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f46\u662f\uff0cint()<\/code> \u51fd\u6570\u4e0d\u80fd\u5904\u7406\u5305\u542b\u5c0f\u6570\u70b9\u7684\u5b57\u7b26\u4e32\u3002\u5982\u679c\u5c1d\u8bd5\u8f6c\u6362\u5305\u542b\u5c0f\u6570\u70b9\u7684\u5b57\u7b26\u4e32\uff0c\u4f1a\u629b\u51fa ValueError<\/code> \u5f02\u5e38\u3002<\/p>\n<\/p>\n
\n
\u4e8c\u3001\u4f7f\u7528 float()<\/code> \u51fd\u6570\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6d6e\u70b9\u6570<\/strong><\/h2>\n
float()<\/code> \u51fd\u6570\u53ef\u4ee5\u5c06\u4e00\u4e2a\u8868\u793a\u6d6e\u70b9\u6570\u7684\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6d6e\u70b9\u6570\u3002<\/p>\n<\/p>\n
\u57fa\u672c\u7528\u6cd5<\/h2>\n<\/p>\n
float()<\/code> \u51fd\u6570\u53ef\u4ee5\u5c06\u5305\u542b\u5c0f\u6570\u70b9\u7684\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6d6e\u70b9\u6570\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
num_str = "123.456"<\/p>\n
num_float = float(num_str)<\/p>\n
print(num_float)  # \u8f93\u51fa\uff1a123.456<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5904\u7406\u79d1\u5b66\u8ba1\u6570\u6cd5\u7684\u5b57\u7b26\u4e32<\/h2>\n<\/p>\n
float()<\/code> \u51fd\u6570\u8fd8\u53ef\u4ee5\u5904\u7406\u79d1\u5b66\u8ba1\u6570\u6cd5\u8868\u793a\u7684\u5b57\u7b26\u4e32\uff1a<\/p>\n<\/p>\n
num_str = "1.23e4"<\/p>\n
num_float = float(num_str)<\/p>\n
print(num_float)  # \u8f93\u51fa\uff1a12300.0<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e0e int()<\/code> \u51fd\u6570\u4e0d\u540c\uff0cfloat()<\/code> \u51fd\u6570\u53ef\u4ee5\u5904\u7406\u5305\u542b\u5c0f\u6570\u70b9\u7684\u5b57\u7b26\u4e32\uff0c\u4f46\u540c\u6837\u4e0d\u80fd\u5904\u7406\u4e0d\u5408\u6cd5\u7684\u5b57\u7b26\u4e32\uff0c\u4f8b\u5982\uff1a"123abc"\u3002<\/p>\n<\/p>\n
\n
\u4e09\u3001\u4f7f\u7528 decimal.Decimal()<\/code> \u7c7b\u8fdb\u884c\u9ad8\u7cbe\u5ea6\u8f6c\u6362<\/strong><\/h2>\n
\u5f53\u5904\u7406\u9700\u8981\u9ad8\u7cbe\u5ea6\u7684\u6570\u503c\u8fd0\u7b97\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528 decimal.Decimal()<\/code> \u7c7b\u3002<\/p>\n<\/p>\n
\u57fa\u672c\u7528\u6cd5<\/h2>\n<\/p>\n
decimal.Decimal()<\/code> \u7c7b\u53ef\u4ee5\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u9ad8\u7cbe\u5ea6\u7684 Decimal<\/code> \u5bf9\u8c61\uff1a<\/p>\n<\/p>\n
from decimal import Decimal<\/p>\n
num_str = "123.456"<\/p>\n
num_decimal = Decimal(num_str)<\/p>\n
print(num_decimal)  # \u8f93\u51fa\uff1a123.456<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u9ad8\u7cbe\u5ea6\u8fd0\u7b97<\/h2>\n<\/p>\n
Decimal<\/code> \u5bf9\u8c61\u63d0\u4f9b\u4e86\u9ad8\u7cbe\u5ea6\u7684\u8fd0\u7b97\u80fd\u529b\uff0c\u975e\u5e38\u9002\u5408\u91d1\u878d\u8ba1\u7b97\u7b49\u9700\u8981\u9ad8\u7cbe\u5ea6\u7684\u573a\u666f\uff1a<\/p>\n<\/p>\n
num_str1 = "0.1"<\/p>\n
num_str2 = "0.2"<\/p>\n
num_decimal1 = Decimal(num_str1)<\/p>\n
num_decimal2 = Decimal(num_str2)<\/p>\n
sum_decimal = num_decimal1 + num_decimal2<\/p>\n
print(sum_decimal)  # \u8f93\u51fa\uff1a0.3<\/p>\n
<\/code><\/pre>\n<\/p>\n
\n
\u56db\u3001\u5904\u7406\u5f02\u5e38\u60c5\u51b5<\/strong><\/h2>\n
\u5728\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6570\u503c\u578b\u65f6\uff0c\u7ecf\u5e38\u4f1a\u9047\u5230\u975e\u6cd5\u5b57\u7b26\u4e32\u5bfc\u81f4\u7684\u5f02\u5e38\u3002\u53ef\u4ee5\u4f7f\u7528 try<\/code> \u548c except<\/code> \u8bed\u53e5\u6765\u5904\u7406\u8fd9\u4e9b\u5f02\u5e38\u3002<\/p>\n<\/p>\n
\u5904\u7406 ValueError<\/code> \u5f02\u5e38<\/h2>\n<\/p>\n
\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
num_str = "abc"<\/p>\n
try:<\/p>\n
    num_int = int(num_str)<\/p>\n
except ValueError:<\/p>\n
    print(f"\u65e0\u6cd5\u5c06 '{num_str}' \u8f6c\u6362\u4e3a\u6574\u6570")<\/p>\n
try:<\/p>\n
    num_float = float(num_str)<\/p>\n
except ValueError:<\/p>\n
    print(f"\u65e0\u6cd5\u5c06 '{num_str}' \u8f6c\u6362\u4e3a\u6d6e\u70b9\u6570")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u81ea\u5b9a\u4e49\u51fd\u6570\u5904\u7406\u8f6c\u6362<\/h2>\n<\/p>\n
\u53ef\u4ee5\u5b9a\u4e49\u4e00\u4e2a\u51fd\u6570\u6765\u5904\u7406\u5b57\u7b26\u4e32\u5230\u6574\u6570\u6216\u6d6e\u70b9\u6570\u7684\u8f6c\u6362\uff0c\u5e76\u8fd4\u56de\u9ed8\u8ba4\u503c\u6216\u9519\u8bef\u4fe1\u606f\uff1a<\/p>\n<\/p>\n
def str_to_int(s, default=0):<\/p>\n
    try:<\/p>\n
        return int(s)<\/p>\n
    except ValueError:<\/p>\n
        return default<\/p>\n
def str_to_float(s, default=0.0):<\/p>\n
    try:<\/p>\n
        return float(s)<\/p>\n
    except ValueError:<\/p>\n
        return default<\/p>\n
num_str = "abc"<\/p>\n
print(str_to_int(num_str))  # \u8f93\u51fa\uff1a0<\/p>\n
print(str_to_float(num_str))  # \u8f93\u51fa\uff1a0.0<\/p>\n
<\/code><\/pre>\n<\/p>\n
\n
\u4e94\u3001\u5b57\u7b26\u4e32\u8f6c\u6362\u6570\u503c\u578b\u7684\u5e94\u7528\u573a\u666f<\/strong><\/h2>\n
\u6570\u636e\u5904\u7406<\/h2>\n<\/p>\n
\u5728\u6570\u636e\u5904\u7406\u4e2d\uff0c\u7ecf\u5e38\u9700\u8981\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6570\u503c\u578b\u3002\u4f8b\u5982\uff0c\u4eceCSV\u6587\u4ef6\u4e2d\u8bfb\u53d6\u6570\u636e\u65f6\uff0c\u901a\u5e38\u4f1a\u8bfb\u53d6\u5230\u5b57\u7b26\u4e32\uff0c\u9700\u8981\u5c06\u5176\u8f6c\u6362\u4e3a\u6570\u503c\u578b\u8fdb\u884c\u540e\u7eed\u5904\u7406\u3002<\/p>\n<\/p>\n
\u7528\u6237\u8f93\u5165<\/h2>\n<\/p>\n
\u5728\u5904\u7406\u7528\u6237\u8f93\u5165\u65f6\uff0c\u901a\u5e38\u4f1a\u5f97\u5230\u5b57\u7b26\u4e32\u5f62\u5f0f\u7684\u8f93\u5165\uff0c\u9700\u8981\u5c06\u5176\u8f6c\u6362\u4e3a\u6570\u503c\u578b\u3002\u4f8b\u5982\uff0c\u7528\u6237\u8f93\u5165\u7684\u5e74\u9f84\u6216\u4ef7\u683c\u7b49\u6570\u636e\u3002<\/p>\n<\/p>\n
\u6570\u503c\u8ba1\u7b97<\/h2>\n<\/p>\n
\u5728\u6570\u503c\u8ba1\u7b97\u4e2d\uff0c\u7ecf\u5e38\u9700\u8981\u5904\u7406\u5b57\u7b26\u4e32\u5f62\u5f0f\u7684\u6570\u636e\uff0c\u5c06\u5176\u8f6c\u6362\u4e3a\u6570\u503c\u578b\u8fdb\u884c\u8ba1\u7b97\u3002\u4f8b\u5982\uff0c\u4ece\u914d\u7f6e\u6587\u4ef6\u6216\u7f51\u7edc\u8bf7\u6c42\u4e2d\u83b7\u53d6\u7684\u6570\u636e\u3002<\/p>\n<\/p>\n
\n
\u516d\u3001\u603b\u7ed3<\/strong><\/h2>\n
\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6570\u503c\u578b\u5728Python\u4e2d\u6709\u591a\u79cd\u65b9\u6cd5\uff0c\u4e3b\u8981\u5305\u62ec\u4f7f\u7528 int()<\/code> \u51fd\u6570\u3001float()<\/code> \u51fd\u6570\u548c decimal.Decimal()<\/code> \u7c7b\u3002\u6bcf\u79cd\u65b9\u6cd5\u90fd\u6709\u5176\u9002\u7528\u573a\u666f\u548c\u4f18\u7f3a\u70b9\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u5e94\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\uff0c\u5e76\u6ce8\u610f\u5904\u7406\u53ef\u80fd\u51fa\u73b0\u7684\u5f02\u5e38\u60c5\u51b5\u3002\u901a\u8fc7\u638c\u63e1\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u53ef\u4ee5\u66f4\u9ad8\u6548\u5730\u5904\u7406\u6570\u636e\u548c\u8fdb\u884c\u6570\u503c\u8ba1\u7b97\u3002<\/p>\n<\/p>\n
\u603b\u4e4b\uff0cint()\u51fd\u6570\u9002\u7528\u4e8e\u6574\u6570\u8f6c\u6362\u3001float()\u51fd\u6570\u9002\u7528\u4e8e\u6d6e\u70b9\u6570\u8f6c\u6362\u3001decimal.Decimal()\u7c7b\u9002\u7528\u4e8e\u9ad8\u7cbe\u5ea6\u6570\u503c\u8fd0\u7b97<\/strong>\u3002\u5728\u5904\u7406\u5b57\u7b26\u4e32\u8f6c\u6362\u6570\u503c\u578b\u65f6\uff0c\u7075\u6d3b\u8fd0\u7528\u8fd9\u4e9b\u65b9\u6cd5\u53ef\u4ee5\u5927\u5927\u63d0\u9ad8\u4ee3\u7801\u7684\u5065\u58ee\u6027\u548c\u53ef\u8bfb\u6027\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5728Python\u4e2d\uff0c\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6570\u503c\u578b\u7684\u5e38\u7528\u65b9\u6cd5\u6709\u54ea\u4e9b\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u6700\u5e38\u7528\u7684\u5b57\u7b26\u4e32\u8f6c\u6570\u503c\u578b\u7684\u65b9\u6cd5\u662f\u4f7f\u7528\u5185\u7f6e\u51fd\u6570int()<\/code>\u548cfloat()<\/code>\u3002int()<\/code>\u51fd\u6570\u53ef\u4ee5\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6574\u6570\uff0c\u800cfloat()<\/code>\u51fd\u6570\u5219\u53ef\u4ee5\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6d6e\u70b9\u6570\u3002\u5982\u679c\u5b57\u7b26\u4e32\u5185\u5bb9\u4e0d\u7b26\u5408\u6570\u503c\u683c\u5f0f\uff0c\u8fd9\u4e9b\u51fd\u6570\u4f1a\u629b\u51faValueError<\/code>\u5f02\u5e38\uff0c\u56e0\u6b64\u5728\u8f6c\u6362\u524d\uff0c\u5efa\u8bae\u4f7f\u7528try...except<\/code>\u7ed3\u6784\u6765\u5904\u7406\u53ef\u80fd\u7684\u9519\u8bef\u3002<\/p>\n
\u5982\u4f55\u5904\u7406\u5b57\u7b26\u4e32\u4e2d\u5305\u542b\u7a7a\u683c\u6216\u5176\u4ed6\u5b57\u7b26\u7684\u60c5\u51b5\uff1f<\/strong>
\u5728\u8f6c\u6362\u5b57\u7b26\u4e32\u4e4b\u524d\uff0c\u53ef\u4ee5\u4f7f\u7528strip()<\/code>\u65b9\u6cd5\u53bb\u9664\u5b57\u7b26\u4e32\u4e24\u7aef\u7684\u7a7a\u683c\u3002\u5bf9\u4e8e\u5305\u542b\u5176\u4ed6\u5b57\u7b26\u7684\u60c5\u51b5\uff0c\u53ef\u4ee5\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u6216\u5b57\u7b26\u4e32\u7684replace()<\/code>\u65b9\u6cd5\u8fdb\u884c\u6e05\u7406\u3002\u4f8b\u5982\uff0c\u82e5\u5b57\u7b26\u4e32\u4e2d\u6709\u9017\u53f7\u53ef\u4ee5\u7528replace(',', '')<\/code>\u5c06\u5176\u79fb\u9664\u3002\u8fd9\u6837\u80fd\u591f\u786e\u4fdd\u8f6c\u6362\u8fc7\u7a0b\u987a\u5229\u8fdb\u884c\u3002<\/p>\n
\u5728\u8f6c\u6362\u8fc7\u7a0b\u4e2d\u9047\u5230\u5f02\u5e38\u8be5\u5982\u4f55\u5904\u7406\uff1f<\/strong>
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