{"id":1142527,"date":"2025-01-08T22:40:59","date_gmt":"2025-01-08T14:40:59","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1142527.html"},"modified":"2025-01-08T22:41:01","modified_gmt":"2025-01-08T14:41:01","slug":"python%e5%a6%82%e4%bd%95%e5%9b%9b%e8%88%8d%e4%ba%94%e5%85%a5%e8%be%93%e5%87%ba%e5%9b%9b%e4%bd%8d%e5%b0%8f%e6%95%b0","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1142527.html","title":{"rendered":"python\u5982\u4f55\u56db\u820d\u4e94\u5165\u8f93\u51fa\u56db\u4f4d\u5c0f\u6570"},"content":{"rendered":"

\"python\u5982\u4f55\u56db\u820d\u4e94\u5165\u8f93\u51fa\u56db\u4f4d\u5c0f\u6570\"<\/p>\n

Python\u4e2d\u56db\u820d\u4e94\u5165\u8f93\u51fa\u56db\u4f4d\u5c0f\u6570\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u5185\u7f6e\u51fd\u6570round()\u3001\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u548cDecimal\u6a21\u5757\u6765\u5b9e\u73b0<\/strong>\u3002\u5176\u4e2d\uff0cround()\u51fd\u6570\u7b80\u5355\u6613\u7528\uff0c\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u7075\u6d3b\uff0cDecimal\u6a21\u5757\u63d0\u4f9b\u9ad8\u7cbe\u5ea6\u63a7\u5236<\/strong>\u3002\u4e0b\u9762\u6211\u4eec\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u5e2e\u52a9\u4f60\u5728\u4e0d\u540c\u573a\u666f\u4e0b\u9009\u62e9\u5408\u9002\u7684\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528round()\u51fd\u6570<\/p>\n<\/p>\n

Python\u5185\u7f6e\u7684round()\u51fd\u6570\u662f\u6700\u7b80\u5355\u7684\u56db\u820d\u4e94\u5165\u65b9\u6cd5\u3002\u5b83\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\uff1a\u8981\u5904\u7406\u7684\u6570\u5b57\u548c\u6240\u9700\u7684\u5c0f\u6570\u4f4d\u6570\u3002<\/p>\n<\/p>\n

number = 3.141592653589793<\/p>\n
rounded_number = round(number, 4)<\/p>\n
print(rounded_number)  # \u8f93\u51fa: 3.1416<\/p>\n
<\/code><\/pre>\n<\/p>\n
round()\u51fd\u6570\u7684\u7b80\u5355\u6613\u7528\u4f7f\u5176\u6210\u4e3a\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u7684\u9996\u9009\u3002\u7136\u800c\uff0c\u8fd9\u79cd\u65b9\u6cd5\u5728\u5904\u7406\u67d0\u4e9b\u8fb9\u754c\u60c5\u51b5\u65f6\u53ef\u80fd\u4f1a\u51fa\u73b0\u4e00\u4e9b\u4e0d\u4e00\u81f4\u7684\u95ee\u9898\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528\u683c\u5f0f\u5316\u5b57\u7b26\u4e32<\/p>\n<\/p>\n
\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u63d0\u4f9b\u4e86\u53e6\u4e00\u79cd\u56db\u820d\u4e94\u5165\u7684\u65b9\u6cd5\uff0c\u5b83\u7279\u522b\u9002\u5408\u9700\u8981\u4ee5\u7279\u5b9a\u683c\u5f0f\u8f93\u51fa\u6570\u5b57\u7684\u573a\u666f\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528f-string\uff08Python 3.6\u53ca\u4ee5\u4e0a\u7248\u672c\uff09\u6216format()\u51fd\u6570\u6765\u5b9e\u73b0\u3002<\/p>\n<\/p>\n
number = 3.141592653589793<\/p>\n
formatted_number = f"{number:.4f}"<\/p>\n
print(formatted_number)  # \u8f93\u51fa: 3.1416<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u6216\u8005\u4f7f\u7528format()\u51fd\u6570\uff1a<\/p>\n<\/p>\n
number = 3.141592653589793<\/p>\n
formatted_number = "{:.4f}".format(number)<\/p>\n
print(formatted_number)  # \u8f93\u51fa: 3.1416<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u4e0d\u4ec5\u80fd\u63a7\u5236\u5c0f\u6570\u4f4d\u6570\uff0c\u8fd8\u80fd\u8f7b\u677e\u5730\u5c06\u6570\u5b57\u5d4c\u5165\u5230\u66f4\u590d\u6742\u7684\u5b57\u7b26\u4e32\u4e2d\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528Decimal\u6a21\u5757<\/p>\n<\/p>\n
\u5bf9\u4e8e\u9700\u8981\u9ad8\u7cbe\u5ea6\u8ba1\u7b97\u7684\u573a\u666f\uff0cDecimal\u6a21\u5757\u662f\u6700\u4f73\u9009\u62e9\u3002\u5b83\u4e0d\u4ec5\u80fd\u7cbe\u786e\u63a7\u5236\u56db\u820d\u4e94\u5165\uff0c\u8fd8\u80fd\u907f\u514d\u6d6e\u70b9\u6570\u8fd0\u7b97\u4e2d\u7684\u8bef\u5dee\u3002<\/p>\n<\/p>\n
from decimal import Decimal, ROUND_HALF_UP<\/p>\n
number = Decimal("3.141592653589793")<\/p>\n
rounded_number = number.quantize(Decimal("1.0000"), rounding=ROUND_HALF_UP)<\/p>\n
print(rounded_number)  # \u8f93\u51fa: 3.1416<\/p>\n
<\/code><\/pre>\n<\/p>\n
Decimal\u6a21\u5757\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u9009\u9879\u6765\u63a7\u5236\u6570\u5b57\u7684\u7cbe\u5ea6\u548c\u820d\u5165\u65b9\u5f0f\uff0c\u975e\u5e38\u9002\u5408\u91d1\u878d\u548c\u79d1\u5b66\u8ba1\u7b97\u7b49\u9700\u8981\u9ad8\u7cbe\u5ea6\u7684\u9886\u57df\u3002<\/p>\n<\/p>\n
\u4e00\u3001ROUND()\u51fd\u6570\u7684\u4f7f\u7528<\/h3>\n<\/p>\n
\u5728Python\u4e2d\uff0cround()\u51fd\u6570\u662f\u6700\u5e38\u7528\u7684\u56db\u820d\u4e94\u5165\u65b9\u6cd5\u4e4b\u4e00\u3002\u5b83\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\uff1a\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u8981\u56db\u820d\u4e94\u5165\u7684\u6570\u5b57\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u8981\u4fdd\u7559\u7684\u5c0f\u6570\u4f4d\u6570\u3002<\/p>\n<\/p>\n
number = 3.141592653589793<\/p>\n
rounded_number = round(number, 4)<\/p>\n
print(rounded_number)  # \u8f93\u51fa: 3.1416<\/p>\n
<\/code><\/pre>\n<\/p>\n
1\u3001\u57fa\u672c\u7528\u6cd5<\/h4>\n<\/p>\n
round()\u51fd\u6570\u7684\u57fa\u672c\u7528\u6cd5\u975e\u5e38\u7b80\u5355\uff0c\u53ea\u9700\u63d0\u4f9b\u8981\u5904\u7406\u7684\u6570\u5b57\u548c\u6240\u9700\u7684\u5c0f\u6570\u4f4d\u6570\u3002\u4ee5\u4e0b\u662f\u51e0\u4e2a\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
print(round(3.141592653589793, 4))  # \u8f93\u51fa: 3.1416<\/p>\n
print(round(2.718281828459045, 4))  # \u8f93\u51fa: 2.7183<\/p>\n
print(round(1.618033988749895, 4))  # \u8f93\u51fa: 1.6180<\/p>\n
<\/code><\/pre>\n<\/p>\n
2\u3001\u8fdb\u9636\u7528\u6cd5<\/h4>\n<\/p>\n
\u867d\u7136round()\u51fd\u6570\u7684\u57fa\u672c\u7528\u6cd5\u5df2\u7ecf\u8986\u76d6\u4e86\u5927\u591a\u6570\u60c5\u51b5\uff0c\u4f46\u5728\u5904\u7406\u67d0\u4e9b\u8fb9\u754c\u60c5\u51b5\u65f6\u53ef\u80fd\u9700\u8981\u989d\u5916\u7684\u6ce8\u610f\u3002\u4f8b\u5982\uff0c\u5f53\u5c0f\u6570\u90e8\u5206\u6070\u597d\u4e3a0.5\u65f6\uff0cround()\u51fd\u6570\u4f1a\u5411\u5076\u6570\u65b9\u5411\u820d\u5165\uff1a<\/p>\n<\/p>\n
print(round(2.5))  # \u8f93\u51fa: 2<\/p>\n
print(round(3.5))  # \u8f93\u51fa: 4<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u820d\u5165\u65b9\u5f0f\u88ab\u79f0\u4e3a"\u94f6\u884c\u5bb6\u820d\u5165"\uff0c\u5b83\u6709\u52a9\u4e8e\u51cf\u5c11\u7d2f\u8ba1\u8bef\u5dee\uff0c\u4f46\u5728\u67d0\u4e9b\u573a\u666f\u4e0b\u53ef\u80fd\u4e0d\u7b26\u5408\u9884\u671f\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u683c\u5f0f\u5316\u5b57\u7b26\u4e32<\/h3>\n<\/p>\n
\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u63d0\u4f9b\u4e86\u53e6\u4e00\u79cd\u56db\u820d\u4e94\u5165\u7684\u65b9\u6cd5\uff0c\u7279\u522b\u9002\u7528\u4e8e\u9700\u8981\u4ee5\u7279\u5b9a\u683c\u5f0f\u8f93\u51fa\u6570\u5b57\u7684\u573a\u666f\u3002Python\u63d0\u4f9b\u4e86\u591a\u79cd\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u7684\u65b9\u6cd5\uff0c\u5305\u62ecf-string\u548cformat()\u51fd\u6570\u3002<\/p>\n<\/p>\n
1\u3001f-string<\/h4>\n<\/p>\n
f-string\u662fPython 3.6\u5f15\u5165\u7684\u4e00\u79cd\u65b0\u7684\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u65b9\u6cd5\uff0c\u5b83\u7b80\u5355\u3001\u76f4\u89c2\uff0c\u975e\u5e38\u9002\u5408\u5d4c\u5165\u53d8\u91cf\u548c\u8868\u8fbe\u5f0f\u3002<\/p>\n<\/p>\n
number = 3.141592653589793<\/p>\n
formatted_number = f"{number:.4f}"<\/p>\n
print(formatted_number)  # \u8f93\u51fa: 3.1416<\/p>\n
<\/code><\/pre>\n<\/p>\n
2\u3001format()\u51fd\u6570<\/h4>\n<\/p>\n
format()\u51fd\u6570\u662f\u53e6\u4e00\u79cd\u5e38\u7528\u7684\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u65b9\u6cd5\uff0c\u5b83\u5728Python 2.7\u548c3.0\u4e2d\u90fd\u53ef\u7528\u3002<\/p>\n<\/p>\n
number = 3.141592653589793<\/p>\n
formatted_number = "{:.4f}".format(number)<\/p>\n
print(formatted_number)  # \u8f93\u51fa: 3.1416<\/p>\n
<\/code><\/pre>\n<\/p>\n
3\u3001\u767e\u5206\u53f7\u683c\u5f0f\u5316<\/h4>\n<\/p>\n
\u867d\u7136\u767e\u5206\u53f7\u683c\u5f0f\u5316\u65b9\u6cd5\u8f83\u4e3a\u53e4\u8001\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u4ecd\u7136\u975e\u5e38\u6709\u7528\u3002<\/p>\n<\/p>\n
number = 3.141592653589793<\/p>\n
formatted_number = "%.4f" % number<\/p>\n
print(formatted_number)  # \u8f93\u51fa: 3.1416<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e09\u3001Decimal\u6a21\u5757<\/h3>\n<\/p>\n
\u5bf9\u4e8e\u9700\u8981\u9ad8\u7cbe\u5ea6\u8ba1\u7b97\u7684\u573a\u666f\uff0cDecimal\u6a21\u5757\u662f\u6700\u4f73\u9009\u62e9\u3002\u5b83\u4e0d\u4ec5\u80fd\u7cbe\u786e\u63a7\u5236\u56db\u820d\u4e94\u5165\uff0c\u8fd8\u80fd\u907f\u514d\u6d6e\u70b9\u6570\u8fd0\u7b97\u4e2d\u7684\u8bef\u5dee\u3002<\/p>\n<\/p>\n
1\u3001\u57fa\u672c\u7528\u6cd5<\/h4>\n<\/p>\n
\u4f7f\u7528Decimal\u6a21\u5757\u9700\u8981\u5148\u5bfc\u5165\u5b83\uff0c\u7136\u540e\u521b\u5efa\u4e00\u4e2aDecimal\u5bf9\u8c61\u3002\u4f60\u53ef\u4ee5\u901a\u8fc7quantize()\u65b9\u6cd5\u6765\u63a7\u5236\u5c0f\u6570\u4f4d\u6570\u548c\u820d\u5165\u65b9\u5f0f\u3002<\/p>\n<\/p>\n
from decimal import Decimal, ROUND_HALF_UP<\/p>\n
number = Decimal("3.141592653589793")<\/p>\n
rounded_number = number.quantize(Decimal("1.0000"), rounding=ROUND_HALF_UP)<\/p>\n
print(rounded_number)  # \u8f93\u51fa: 3.1416<\/p>\n
<\/code><\/pre>\n<\/p>\n
2\u3001\u81ea\u5b9a\u4e49\u820d\u5165\u65b9\u5f0f<\/h4>\n<\/p>\n
Decimal\u6a21\u5757\u63d0\u4f9b\u4e86\u591a\u79cd\u820d\u5165\u65b9\u5f0f\uff0c\u5305\u62ecROUND_CEILING\u3001ROUND_FLOOR\u3001ROUND_DOWN\u3001ROUND_UP\u7b49\u3002\u4f60\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u820d\u5165\u65b9\u5f0f\u3002<\/p>\n<\/p>\n
from decimal import Decimal, ROUND_DOWN<\/p>\n
number = Decimal("3.141592653589793")<\/p>\n
rounded_number = number.quantize(Decimal("1.0000"), rounding=ROUND_DOWN)<\/p>\n
print(rounded_number)  # \u8f93\u51fa: 3.1415<\/p>\n
<\/code><\/pre>\n<\/p>\n
3\u3001\u9ad8\u7cbe\u5ea6\u8ba1\u7b97<\/h4>\n<\/p>\n
Decimal\u6a21\u5757\u975e\u5e38\u9002\u5408\u9700\u8981\u9ad8\u7cbe\u5ea6\u8ba1\u7b97\u7684\u573a\u666f\uff0c\u5982\u91d1\u878d\u548c\u79d1\u5b66\u8ba1\u7b97\u3002\u5b83\u80fd\u907f\u514d\u6d6e\u70b9\u6570\u8fd0\u7b97\u4e2d\u7684\u8bef\u5dee\uff0c\u786e\u4fdd\u8ba1\u7b97\u7ed3\u679c\u7684\u51c6\u786e\u6027\u3002<\/p>\n<\/p>\n
from decimal import Decimal<\/p>\n
\u9ad8\u7cbe\u5ea6\u8ba1\u7b97<\/strong><\/h2>\n
number1 = Decimal("1.0000000000000001")<\/p>\n
number2 = Decimal("2.0000000000000001")<\/p>\n
result = number1 + number2<\/p>\n
print(result)  # \u8f93\u51fa: 3.0000000000000002<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u56db\u3001\u4e0d\u540c\u65b9\u6cd5\u7684\u5bf9\u6bd4\u548c\u9009\u62e9<\/h3>\n<\/p>\n
\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u9009\u62e9\u5408\u9002\u7684\u56db\u820d\u4e94\u5165\u65b9\u6cd5\u53d6\u51b3\u4e8e\u5177\u4f53\u9700\u6c42\u548c\u573a\u666f\u3002\u4e0b\u9762\u5bf9\u4e0a\u8ff0\u65b9\u6cd5\u8fdb\u884c\u5bf9\u6bd4\uff0c\u5e2e\u52a9\u4f60\u505a\u51fa\u6700\u4f73\u9009\u62e9\u3002<\/p>\n<\/p>\n
1\u3001round()\u51fd\u6570 vs. \u683c\u5f0f\u5316\u5b57\u7b26\u4e32<\/h4>\n<\/p>\n
round()\u51fd\u6570\u7b80\u5355\u6613\u7528\uff0c\u9002\u5408\u5927\u591a\u6570\u60c5\u51b5\u3002\u7136\u800c\uff0c\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u63d0\u4f9b\u4e86\u66f4\u591a\u7684\u7075\u6d3b\u6027\uff0c\u7279\u522b\u662f\u5728\u9700\u8981\u4ee5\u7279\u5b9a\u683c\u5f0f\u8f93\u51fa\u6570\u5b57\u65f6\u3002<\/p>\n<\/p>\n
number = 3.141592653589793<\/p>\n
rounded_number = round(number, 4)<\/p>\n
formatted_number = f"{number:.4f}"<\/p>\n
print(rounded_number)  # \u8f93\u51fa: 3.1416<\/p>\n
print(formatted_number)  # \u8f93\u51fa: 3.1416<\/p>\n
<\/code><\/pre>\n<\/p>\n
2\u3001round()\u51fd\u6570 vs. Decimal\u6a21\u5757<\/h4>\n<\/p>\n
\u5bf9\u4e8e\u5927\u591a\u6570\u7b80\u5355\u7684\u56db\u820d\u4e94\u5165\u4efb\u52a1\uff0cround()\u51fd\u6570\u5df2\u7ecf\u8db3\u591f\u3002\u7136\u800c\uff0c\u5f53\u9700\u8981\u9ad8\u7cbe\u5ea6\u8ba1\u7b97\u65f6\uff0cDecimal\u6a21\u5757\u662f\u66f4\u597d\u7684\u9009\u62e9\u3002<\/p>\n<\/p>\n
from decimal import Decimal, ROUND_HALF_UP<\/p>\n
number = Decimal("3.141592653589793")<\/p>\n
rounded_number = number.quantize(Decimal("1.0000"), rounding=ROUND_HALF_UP)<\/p>\n
print(rounded_number)  # \u8f93\u51fa: 3.1416<\/p>\n
<\/code><\/pre>\n<\/p>\n
3\u3001\u683c\u5f0f\u5316\u5b57\u7b26\u4e32 vs. Decimal\u6a21\u5757<\/h4>\n<\/p>\n
\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u9002\u5408\u9700\u8981\u4ee5\u7279\u5b9a\u683c\u5f0f\u8f93\u51fa\u6570\u5b57\u7684\u573a\u666f\uff0c\u800cDecimal\u6a21\u5757\u66f4\u9002\u5408\u9700\u8981\u9ad8\u7cbe\u5ea6\u8ba1\u7b97\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n
from decimal import Decimal, ROUND_HALF_UP<\/p>\n
number = Decimal("3.141592653589793")<\/p>\n
rounded_number = number.quantize(Decimal("1.0000"), rounding=ROUND_HALF_UP)<\/p>\n
formatted_number = f"{rounded_number:.4f}"<\/p>\n
print(formatted_number)  # \u8f93\u51fa: 3.1416<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e94\u3001\u5b9e\u9645\u5e94\u7528\u573a\u666f<\/h3>\n<\/p>\n
\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u4e0d\u540c\u7684\u56db\u820d\u4e94\u5165\u65b9\u6cd5\u9002\u7528\u4e8e\u4e0d\u540c\u7684\u573a\u666f\u3002\u4e0b\u9762\u5217\u4e3e\u51e0\u4e2a\u5e38\u89c1\u7684\u5e94\u7528\u573a\u666f\uff0c\u5e2e\u52a9\u4f60\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
1\u3001\u8d22\u52a1\u8ba1\u7b97<\/h4>\n<\/p>\n
\u5728\u8d22\u52a1\u8ba1\u7b97\u4e2d\uff0c\u51c6\u786e\u6027\u81f3\u5173\u91cd\u8981\u3002\u6b64\u65f6\uff0cDecimal\u6a21\u5757\u662f\u6700\u4f73\u9009\u62e9\u3002<\/p>\n<\/p>\n
from decimal import Decimal, ROUND_HALF_UP<\/p>\n
\u8d22\u52a1\u8ba1\u7b97<\/strong><\/h2>\n
amount = Decimal("1234.56789")<\/p>\n
rounded_amount = amount.quantize(Decimal("1.0000"), rounding=ROUND_HALF_UP)<\/p>\n
print(rounded_amount)  # \u8f93\u51fa: 1234.5679<\/p>\n
<\/code><\/pre>\n<\/p>\n
2\u3001\u79d1\u5b66\u8ba1\u7b97<\/h4>\n<\/p>\n
\u5728\u79d1\u5b66\u8ba1\u7b97\u4e2d\uff0c\u7cbe\u5ea6\u540c\u6837\u975e\u5e38\u91cd\u8981\u3002Decimal\u6a21\u5757\u4f9d\u7136\u662f\u6700\u4f73\u9009\u62e9\u3002<\/p>\n<\/p>\n
from decimal import Decimal<\/p>\n
\u79d1\u5b66\u8ba1\u7b97<\/strong><\/h2>\n
value = Decimal("3.141592653589793")<\/p>\n
result = value * Decimal("2.718281828459045")<\/p>\n
print(result)  # \u8f93\u51fa: 8.539734222673566<\/p>\n
<\/code><\/pre>\n<\/p>\n
3\u3001\u6570\u636e\u5c55\u793a<\/h4>\n<\/p>\n
\u5728\u6570\u636e\u5c55\u793a\u4e2d\uff0c\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u63d0\u4f9b\u4e86\u66f4\u591a\u7684\u7075\u6d3b\u6027\uff0c\u4f7f\u4f60\u53ef\u4ee5\u4ee5\u7279\u5b9a\u683c\u5f0f\u8f93\u51fa\u6570\u5b57\u3002<\/p>\n<\/p>\n
number = 3.141592653589793<\/p>\n
formatted_number = f"{number:.4f}"<\/p>\n
print(f"The value of pi is approximately {formatted_number}.")<\/p>\n
\u8f93\u51fa: The value of pi is approximately 3.1416.<\/strong><\/h2>\n
<\/code><\/pre>\n<\/p>\n
\u516d\u3001\u5e38\u89c1\u95ee\u9898\u548c\u89e3\u51b3\u65b9\u6848<\/h3>\n<\/p>\n
\u5728\u5b9e\u9645\u4f7f\u7528\u4e2d\uff0c\u4f60\u53ef\u80fd\u4f1a\u9047\u5230\u4e00\u4e9b\u5e38\u89c1\u95ee\u9898\u3002\u4e0b\u9762\u5217\u4e3e\u51e0\u4e2a\u5e38\u89c1\u95ee\u9898\u53ca\u5176\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<\/p>\n
1\u3001\u6d6e\u70b9\u6570\u7cbe\u5ea6\u95ee\u9898<\/h4>\n<\/p>\n
\u6d6e\u70b9\u6570\u7cbe\u5ea6\u95ee\u9898\u662fPython\u4e2d\u4e00\u4e2a\u5e38\u89c1\u7684\u56f0\u6270\u3002\u4f7f\u7528Decimal\u6a21\u5757\u53ef\u4ee5\u6709\u6548\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n<\/p>\n
from decimal import Decimal<\/p>\n
\u6d6e\u70b9\u6570\u7cbe\u5ea6\u95ee\u9898<\/strong><\/h2>\n
number1 = Decimal("1.0000000000000001")<\/p>\n
number2 = Decimal("2.0000000000000001")<\/p>\n
result = number1 + number2<\/p>\n
print(result)  # \u8f93\u51fa: 3.0000000000000002<\/p>\n
<\/code><\/pre>\n<\/p>\n
2\u3001\u820d\u5165\u65b9\u5f0f\u4e0d\u7b26\u5408\u9884\u671f<\/h4>\n<\/p>\n
\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0cround()\u51fd\u6570\u7684\u820d\u5165\u65b9\u5f0f\u53ef\u80fd\u4e0d\u7b26\u5408\u9884\u671f\u3002\u6b64\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528Decimal\u6a21\u5757\u5e76\u6307\u5b9a\u820d\u5165\u65b9\u5f0f\u3002<\/p>\n<\/p>\n
from decimal import Decimal, ROUND_DOWN<\/p>\n
\u81ea\u5b9a\u4e49\u820d\u5165\u65b9\u5f0f<\/strong><\/h2>\n
number = Decimal("3.141592653589793")<\/p>\n
rounded_number = number.quantize(Decimal("1.0000"), rounding=ROUND_DOWN)<\/p>\n
print(rounded_number)  # \u8f93\u51fa: 3.1415<\/p>\n
<\/code><\/pre>\n<\/p>\n
3\u3001\u9700\u8981\u5728\u5b57\u7b26\u4e32\u4e2d\u5d4c\u5165\u56db\u820d\u4e94\u5165\u540e\u7684\u6570\u5b57<\/h4>\n<\/p>\n
\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u975e\u5e38\u9002\u5408\u8fd9\u79cd\u60c5\u51b5\u3002<\/p>\n<\/p>\n
number = 3.141592653589793<\/p>\n
formatted_number = f"{number:.4f}"<\/p>\n
print(f"The value of pi is approximately {formatted_number}.")<\/p>\n
\u8f93\u51fa: The value of pi is approximately 3.1416.<\/strong><\/h2>\n
<\/code><\/pre>\n<\/p>\n
\u4e03\u3001\u603b\u7ed3<\/h3>\n<\/p>\n
Python\u63d0\u4f9b\u4e86\u591a\u79cd\u56db\u820d\u4e94\u5165\u7684\u65b9\u6cd5\uff0c\u6bcf\u79cd\u65b9\u6cd5\u90fd\u6709\u5176\u9002\u7528\u7684\u573a\u666f\u3002round()\u51fd\u6570\u7b80\u5355\u6613\u7528\uff0c\u9002\u5408\u5927\u591a\u6570\u60c5\u51b5\uff1b\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u7075\u6d3b\uff0c\u9002\u5408\u9700\u8981\u4ee5\u7279\u5b9a\u683c\u5f0f\u8f93\u51fa\u6570\u5b57\u7684\u573a\u666f\uff1bDecimal\u6a21\u5757\u63d0\u4f9b\u9ad8\u7cbe\u5ea6\u63a7\u5236\uff0c\u9002\u5408\u9700\u8981\u7cbe\u786e\u8ba1\u7b97\u7684\u573a\u666f<\/strong>\u3002\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6709\u6548\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u9760\u6027\u548c\u53ef\u8bfb\u6027\u3002\u5e0c\u671b\u672c\u6587\u80fd\u5e2e\u52a9\u4f60\u66f4\u597d\u5730\u7406\u89e3\u548c\u5e94\u7528Python\u4e2d\u7684\u56db\u820d\u4e94\u5165\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u638c\u63e1\u8fd9\u4e9b\u65b9\u6cd5\u4e0d\u4ec5\u80fd\u63d0\u9ad8\u4ee3\u7801\u7684\u51c6\u786e\u6027\uff0c\u8fd8\u80fd\u4f7f\u4f60\u5728\u5904\u7406\u4e0d\u540c\u7684\u6570\u503c\u8ba1\u7b97\u4efb\u52a1\u65f6\u6e38\u5203\u6709\u4f59\u3002\u5982\u679c\u4f60\u5728\u4f7f\u7528\u8fc7\u7a0b\u4e2d\u9047\u5230\u95ee\u9898\uff0c\u4e0d\u59a8\u56de\u987e\u672c\u6587\uff0c\u627e\u5230\u5408\u9002\u7684\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u5728Python\u4e2d\u5b9e\u73b0\u56db\u820d\u4e94\u5165\u5230\u56db\u4f4d\u5c0f\u6570\u7684\u529f\u80fd\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u5185\u7f6e\u7684round()<\/code>\u51fd\u6570\u6765\u5b9e\u73b0\u56db\u820d\u4e94\u5165\u3002\u53ea\u9700\u5c06\u9700\u8981\u5904\u7406\u7684\u6570\u5b57\u548c\u5e0c\u671b\u4fdd\u7559\u7684\u5c0f\u6570\u4f4d\u6570\u4f5c\u4e3a\u53c2\u6570\u4f20\u5165\u3002\u4f8b\u5982\uff0cround(3.1415926535, 4)<\/code>\u5c06\u8fd4\u56de3.1416<\/code>\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u8f7b\u677e\u5730\u5f97\u5230\u56db\u4f4d\u5c0f\u6570\u7684\u7ed3\u679c\u3002<\/p>\n
\u4f7f\u7528\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u8f93\u51fa\u56db\u4f4d\u5c0f\u6570\u6709\u4ec0\u4e48\u65b9\u6cd5\uff1f<\/strong>
\u9664\u4e86\u4f7f\u7528round()<\/code>\u51fd\u6570\uff0cPython\u8fd8\u652f\u6301\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u6765\u63a7\u5236\u8f93\u51fa\u7684\u7cbe\u5ea6\u3002\u53ef\u4ee5\u4f7f\u7528f-string<\/code>\u6216str.format()<\/code>\u65b9\u6cd5\u3002\u4f8b\u5982\uff0c\u901a\u8fc7f"{value:.4f}"<\/code>\u6216"{:.4f}".format(value)<\/code>\uff0c\u90fd\u53ef\u4ee5\u5c06\u6570\u5b57\u683c\u5f0f\u5316\u4e3a\u56db\u4f4d\u5c0f\u6570\uff0c\u786e\u4fdd\u8f93\u51fa\u7684\u7ed3\u679c\u7b26\u5408\u8981\u6c42\u3002<\/p>\n
Python\u4e2d\u5982\u4f55\u5904\u7406\u8d1f\u6570\u7684\u56db\u820d\u4e94\u5165\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u8d1f\u6570\u7684\u56db\u820d\u4e94\u5165\u4e0e\u6b63\u6570\u76f8\u540c\u3002\u65e0\u8bba\u662f\u4f7f\u7528round()<\/code>\u51fd\u6570\u8fd8\u662f\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\uff0c\u8d1f\u6570\u90fd\u4f1a\u6309\u7167\u76f8\u540c\u7684\u89c4\u5219\u5904\u7406\u3002\u4f8b\u5982\uff0cround(-3.1415926535, 4)<\/code>\u4f1a\u8fd4\u56de-3.1416<\/code>\u3002\u56e0\u6b64\uff0c\u4f7f\u7528\u8fd9\u4e9b\u65b9\u6cd5\u65f6\uff0c\u786e\u4fdd\u8d1f\u6570\u7684\u5904\u7406\u4e0d\u4f1a\u4ea7\u751f\u610f\u5916\u7684\u7ed3\u679c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Python\u4e2d\u56db\u820d\u4e94\u5165\u8f93\u51fa\u56db\u4f4d\u5c0f\u6570\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u5185\u7f6e\u51fd\u6570round()\u3001\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u548cDecimal\u6a21\u5757\u6765\u5b9e\u73b0\u3002 […]","protected":false},"author":3,"featured_media":1142531,"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\/1142527"}],"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=1142527"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1142527\/revisions"}],"predecessor-version":[{"id":1142532,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1142527\/revisions\/1142532"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1142531"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1142527"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1142527"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1142527"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}