![\"python\u4e2d\u5982\u4f55\u5bf9\u6570\u503c\u4fdd\u7559\u56db\u4f4d\u6570\"](\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/24181618\/c8ca6492-29db-4ffa-a1cc-d1deb0307369.webp\")
<\/p>\n<\/p>\n
\u5728Python\u4e2d\uff0c\u5bf9\u6570\u503c\u4fdd\u7559\u56db\u4f4d\u6570\u4e3b\u8981\u53ef\u4ee5\u901a\u8fc7<\/strong>\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u3001\u4f7f\u7528\u5185\u7f6e\u51fd\u6570 \u5176\u4e2d\uff0c\u683c\u5f0f\u5316\u5b57\u7b26\u4e32<\/strong> \u662f\u6700\u5e38\u7528\u4e14\u7075\u6d3b\u7684\u65b9\u6cd5\u3002\u901a\u8fc7\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\uff0c\u53ef\u4ee5\u76f4\u63a5\u6307\u5b9a\u5c0f\u6570\u70b9\u540e\u7684\u4f4d\u6570\uff0c\u5e76\u4e14\u53ef\u4ee5\u63a7\u5236\u8f93\u51fa\u7684\u683c\u5f0f\uff0c\u8fd9\u5bf9\u4e8e\u6570\u636e\u5c55\u793a\u548c\u5bf9\u9f50\u975e\u5e38\u6709\u7528\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u63a2\u8ba8\u8fd9\u4e9b\u65b9\u6cd5\u53ca\u5176\u5b9e\u73b0\u3002<\/p>\n<\/p>\n Python 3.6\u5f15\u5165\u4e86f-string\uff0c\u662f\u4e00\u79cd\u7b80\u6d01\u4e14\u76f4\u89c2\u7684\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u65b9\u5f0f\u3002\u5b83\u5141\u8bb8\u5728\u5b57\u7b26\u4e32\u4e2d\u76f4\u63a5\u5d4c\u5165\u53d8\u91cf\uff0c\u5e76\u4e14\u53ef\u4ee5\u901a\u8fc7\u6307\u5b9a\u683c\u5f0f\u6765\u63a7\u5236\u6570\u503c\u7684\u663e\u793a\u7cbe\u5ea6\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n formatted_num = f"{num:.4f}"<\/p>\n print(formatted_num) # \u8f93\u51fa\uff1a123.4568<\/p>\n <\/code><\/pre>\n<\/p>\n \u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c formatted_num = "{:.4f}".format(num)<\/p>\n print(formatted_num) # \u8f93\u51fa\uff1a123.4568<\/p>\n <\/code><\/pre>\n<\/p>\n \u8fd9\u91cc\u7684 \u8fd9\u662fPython\u8f83\u65e9\u671f\u7684\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u65b9\u6cd5\uff0c\u9002\u7528\u4e8ePython 2\u548cPython 3\u3002\u867d\u7136\u8fd9\u79cd\u65b9\u6cd5\u5728\u73b0\u4ee3Python\u4e2d\u4e0d\u592a\u5e38\u7528\uff0c\u4f46\u4e86\u89e3\u5b83\u4ecd\u7136\u5f88\u6709\u5fc5\u8981\uff1a<\/p>\n<\/p>\n formatted_num = "%.4f" % num<\/p>\n print(formatted_num) # \u8f93\u51fa\uff1a123.4568<\/p>\n <\/code><\/pre>\n<\/p>\n \u8fd9\u91cc\u7684 rounded_num = round(num, 4)<\/p>\n print(rounded_num) # \u8f93\u51fa\uff1a123.4568<\/p>\n <\/code><\/pre>\n<\/p>\n \u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c num = Decimal("123.456789")<\/p>\n formatted_num = num.quantize(Decimal("0.0001"), rounding=ROUND_HALF_UP)<\/p>\n print(formatted_num) # \u8f93\u51fa\uff1a123.4568<\/p>\n <\/code><\/pre>\n<\/p>\n \u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c \u5728\u6570\u636e\u5c55\u793a\u4e2d\uff0c\u5bf9\u6570\u503c\u8fdb\u884c\u683c\u5f0f\u5316\u53ef\u4ee5\u63d0\u5347\u6570\u636e\u7684\u53ef\u8bfb\u6027\u3002\u4f8b\u5982\uff0c\u5728\u91d1\u878d\u62a5\u8868\u4e2d\uff0c\u4fdd\u7559\u56db\u4f4d\u5c0f\u6570\u53ef\u4ee5\u51c6\u786e\u5c55\u793a\u8d27\u5e01\u548c\u5229\u7387\u7b49\u4fe1\u606f\u3002<\/p>\n<\/p>\n formatted_amount = f"${amount:.4f}"<\/p>\n print(formatted_amount) # \u8f93\u51fa\uff1a$1234.5679<\/p>\n <\/code><\/pre>\n<\/p>\n \u5728\u79d1\u5b66\u8ba1\u7b97\u4e2d\uff0c\u5bf9\u6570\u503c\u7684\u7cbe\u5ea6\u8981\u6c42\u8f83\u9ad8\uff0c\u901a\u8fc7\u683c\u5f0f\u5316\u53ef\u4ee5\u786e\u4fdd\u7ed3\u679c\u7684\u51c6\u786e\u6027\u3002\u4f8b\u5982\uff0c\u8ba1\u7b97\u7269\u7406\u5e38\u6570\u65f6\uff0c\u9700\u8981\u4fdd\u7559\u4e00\u5b9a\u7684\u7cbe\u5ea6\u3002<\/p>\n<\/p>\n pi = math.pi<\/p>\n formatted_pi = f"{pi:.4f}"<\/p>\n print(formatted_pi) # \u8f93\u51fa\uff1a3.1416<\/p>\n <\/code><\/pre>\n<\/p>\n \u5728\u6570\u636e\u5b58\u50a8\u4e2d\uff0c\u4fdd\u7559\u4e00\u5b9a\u7684\u5c0f\u6570\u4f4d\u6570\u53ef\u4ee5\u8282\u7701\u5b58\u50a8\u7a7a\u95f4\uff0c\u540c\u65f6\u4fdd\u8bc1\u6570\u636e\u7684\u7cbe\u5ea6\u3002\u4f8b\u5982\uff0c\u5728\u6570\u636e\u5e93\u4e2d\u5b58\u50a8\u6d6e\u70b9\u6570\u65f6\uff0c\u53ef\u4ee5\u9884\u5148\u683c\u5f0f\u5316\u6570\u503c\u3002<\/p>\n<\/p>\n num = 123.456789<\/p>\n formatted_num = f"{num:.4f}"<\/p>\n conn = sqlite3.connect('example.db')<\/p>\n c = conn.cursor()<\/p>\n c.execute('CREATE TABLE IF NOT EXISTS numbers (num REAL)')<\/p>\n c.execute('INSERT INTO numbers (num) VALUES (?)', (formatted_num,))<\/p>\n conn.commit()<\/p>\n conn.close()<\/p>\n <\/code><\/pre>\n<\/p>\n \u5728\u6570\u636e\u5206\u6790\u4e2d\uff0c\u4fdd\u7559\u4e00\u5b9a\u7684\u5c0f\u6570\u4f4d\u6570\u53ef\u4ee5\u63d0\u9ad8\u6570\u636e\u7684\u7cbe\u5ea6\u548c\u5206\u6790\u7ed3\u679c\u7684\u53ef\u4fe1\u5ea6\u3002\u4f8b\u5982\uff0c\u5728\u7edf\u8ba1\u5206\u6790\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u683c\u5f0f\u5316\u6570\u503c\u6765\u5c55\u793a\u5e73\u5747\u503c\u3001\u6807\u51c6\u5dee\u7b49\u7ed3\u679c\u3002<\/p>\n<\/p>\n data = [1.23456789, 2.3456789, 3.456789]<\/p>\n mean = np.mean(data)<\/p>\n formatted_mean = f"{mean:.4f}"<\/p>\n print(formatted_mean) # \u8f93\u51fa\uff1a2.3457<\/p>\n <\/code><\/pre>\n<\/p>\n \u5728Python\u4e2d\uff0c\u5bf9\u6570\u503c\u4fdd\u7559\u56db\u4f4d\u6570\u7684\u65b9\u6cd5\u591a\u79cd\u591a\u6837\uff0c\u4e3b\u8981\u5305\u62ec\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u3001\u4f7f\u7528\u5185\u7f6e\u51fd\u6570 \u5728Python\u4e2d\uff0c\u5982\u4f55\u4f7f\u7528\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u6765\u4fdd\u7559\u6570\u503c\u7684\u56db\u4f4d\u5c0f\u6570\uff1f<\/strong> Python\u4e2d\u6709\u6ca1\u6709\u5185\u7f6e\u51fd\u6570\u7528\u4e8e\u4fdd\u7559\u56db\u4f4d\u5c0f\u6570\uff1f<\/strong> \u5982\u4f55\u5728Pandas\u4e2d\u5bf9\u6570\u636e\u6846\u7684\u6570\u503c\u5217\u4fdd\u7559\u56db\u4f4d\u5c0f\u6570\uff1f<\/strong>round()<\/code>\u3001\u4ee5\u53ca<\/strong>\u5e93\u51fd\u6570decimal<\/code>\u7b49\u65b9\u5f0f\u5b9e\u73b0\u3002<\/strong> <\/p>\n<\/p>\n\u4e00\u3001\u683c\u5f0f\u5316\u5b57\u7b26\u4e32<\/strong><\/h2>\n
1. \u4f7f\u7528f-string<\/h2>\n<\/p>\n
num = 123.456789<\/p>\n{num:.4f}<\/code>\u8868\u793a\u5c06num<\/code>\u683c\u5f0f\u5316\u4e3a\u5c0f\u6570\u70b9\u540e\u4fdd\u75594\u4f4d\u7684\u5c0f\u6570\u3002<\/p>\n<\/p>\n2. \u4f7f\u7528
format()<\/code>\u65b9\u6cd5<\/h2>\n<\/p>\nformat()<\/code>\u65b9\u6cd5\u662fPython\u5185\u7f6e\u7684\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5e7f\u6cdb\u5e94\u7528\u4e8ePython 2\u548cPython 3\u3002\u5b83\u7684\u4f7f\u7528\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n<\/p>\nnum = 123.456789<\/p>\n{:.4f}<\/code>\u4e0ef-string\u7684\u4f7f\u7528\u65b9\u6cd5\u7c7b\u4f3c\uff0c\u540c\u6837\u662f\u5c06\u6570\u503c\u683c\u5f0f\u5316\u4e3a\u5c0f\u6570\u70b9\u540e\u4fdd\u75594\u4f4d\u7684\u5c0f\u6570\u3002<\/p>\n<\/p>\n3. \u4f7f\u7528\u767e\u5206\u53f7
%<\/code>\u683c\u5f0f\u5316<\/h2>\n<\/p>\nnum = 123.456789<\/p>\n%.4f<\/code>\u8868\u793a\u5c06\u6570\u503c\u683c\u5f0f\u5316\u4e3a\u5c0f\u6570\u70b9\u540e\u4fdd\u75594\u4f4d\u7684\u5c0f\u6570\u3002<\/p>\n<\/p>\n\u4e8c\u3001\u4f7f\u7528
round()<\/code>\u51fd\u6570<\/strong><\/h2>\nround()<\/code>\u662fPython\u5185\u7f6e\u7684\u51fd\u6570\uff0c\u7528\u4e8e\u5bf9\u6d6e\u70b9\u6570\u8fdb\u884c\u56db\u820d\u4e94\u5165\uff0c\u5e76\u53ef\u4ee5\u6307\u5b9a\u4fdd\u7559\u7684\u5c0f\u6570\u4f4d\u6570\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cround()<\/code>\u8fd4\u56de\u7684\u7ed3\u679c\u4ecd\u7136\u662f\u6d6e\u70b9\u6570\uff0c\u4e0d\u4f1a\u81ea\u52a8\u8f6c\u4e3a\u5b57\u7b26\u4e32\u3002<\/p>\n<\/p>\nnum = 123.456789<\/p>\nround(num, 4)<\/code>\u8868\u793a\u5c06num<\/code>\u56db\u820d\u4e94\u5165\u5230\u5c0f\u6570\u70b9\u540e4\u4f4d\u3002<\/p>\n<\/p>\n\u4e09\u3001\u4f7f\u7528
decimal<\/code>\u6a21\u5757<\/strong><\/h2>\ndecimal<\/code>\u6a21\u5757\u63d0\u4f9b\u4e86\u66f4\u9ad8\u7cbe\u5ea6\u7684\u6d6e\u70b9\u8fd0\u7b97\uff0c\u9002\u7528\u4e8e\u5bf9\u7cbe\u5ea6\u8981\u6c42\u8f83\u9ad8\u7684\u573a\u666f\u3002\u901a\u8fc7decimal<\/code>\u6a21\u5757\uff0c\u53ef\u4ee5\u7cbe\u786e\u63a7\u5236\u6570\u503c\u7684\u8fd0\u7b97\u548c\u683c\u5f0f\u5316\u3002<\/p>\n<\/p>\nfrom decimal import Decimal, ROUND_HALF_UP<\/p>\nDecimal("123.456789")<\/code>\u5c06\u6570\u503c\u8f6c\u6362\u4e3aDecimal<\/code>\u5bf9\u8c61\uff0cnum.quantize(Decimal("0.0001"), rounding=ROUND_HALF_UP)<\/code>\u5c06\u6570\u503c\u683c\u5f0f\u5316\u4e3a\u5c0f\u6570\u70b9\u540e\u4fdd\u75594\u4f4d\u7684\u5c0f\u6570\uff0c\u5e76\u91c7\u7528\u56db\u820d\u4e94\u5165\u7684\u65b9\u5f0f\u3002<\/p>\n<\/p>\n\u56db\u3001\u5e94\u7528\u573a\u666f\u8be6\u89e3<\/strong><\/h2>\n
1. \u6570\u636e\u5c55\u793a<\/h2>\n<\/p>\n
amount = 1234.56789<\/p>\n2. \u79d1\u5b66\u8ba1\u7b97<\/h2>\n<\/p>\n
import math<\/p>\n3. \u6570\u636e\u5b58\u50a8<\/h2>\n<\/p>\n
import sqlite3<\/p>\n\u5b58\u50a8\u5230\u6570\u636e\u5e93<\/strong><\/h2>\n
4. \u6570\u636e\u5206\u6790<\/h2>\n<\/p>\n
import numpy as np<\/p>\n\u4e94\u3001\u603b\u7ed3<\/strong><\/h2>\n
round()<\/code>\u3001\u4ee5\u53ca\u5e93\u51fd\u6570decimal<\/code>\u7b49\u3002<\/strong>\u5176\u4e2d\uff0c\u683c\u5f0f\u5316\u5b57\u7b26\u4e32<\/strong> \u662f\u6700\u5e38\u7528\u4e14\u7075\u6d3b\u7684\u65b9\u6cd5\uff0c\u7279\u522b\u662ff-string\u548cformat()<\/code>\u65b9\u6cd5\u3002\u6b64\u5916\uff0cround()<\/code>\u51fd\u6570\u548cdecimal<\/code>\u6a21\u5757\u4e5f\u63d0\u4f9b\u4e86\u4e0d\u540c\u573a\u666f\u4e0b\u7684\u89e3\u51b3\u65b9\u6848\u3002\u6839\u636e\u4e0d\u540c\u7684\u5e94\u7528\u573a\u666f\uff0c\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u53ef\u4ee5\u6709\u6548\u5730\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u6570\u636e\u7684\u51c6\u786e\u6027\u3002<\/p>\n<\/p>\n\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
\u53ef\u4ee5\u4f7f\u7528\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\uff08f-string\uff09\u6765\u8f7b\u677e\u5730\u63a7\u5236\u5c0f\u6570\u4f4d\u6570\u3002\u901a\u8fc7\u5728\u82b1\u62ec\u53f7\u5185\u6307\u5b9a\u683c\u5f0f\uff0c\u53ef\u4ee5\u5b9e\u73b0\u5bf9\u6570\u503c\u7684\u7cbe\u786e\u63a7\u5236\u3002\u4f8b\u5982\uff0cvalue = 3.14159265<\/code>\uff0c\u4f7f\u7528formatted_value = f"{value:.4f}"<\/code>\u53ef\u4ee5\u5f97\u52303.1416<\/code>\uff0c\u8fd9\u6837\u5c31\u80fd\u4fdd\u7559\u56db\u4f4d\u5c0f\u6570\u3002<\/p>\n
\u662f\u7684\uff0cPython\u63d0\u4f9b\u4e86round()<\/code>\u51fd\u6570\uff0c\u53ef\u4ee5\u7528\u6765\u5bf9\u6570\u503c\u8fdb\u884c\u56db\u820d\u4e94\u5165\u3002\u4f7f\u7528\u65b9\u6cd5\u4e3arounded_value = round(value, 4)<\/code>\uff0c\u8fd9\u5c06\u8fd4\u56de\u4e00\u4e2a\u4fdd\u7559\u56db\u4f4d\u5c0f\u6570\u7684\u6570\u503c\u3002\u4f8b\u5982\uff0cround(2.718281828, 4)<\/code>\u7684\u7ed3\u679c\u4e3a2.7183<\/code>\u3002<\/p>\n
\u5728Pandas\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528DataFrame<\/code>\u7684round()<\/code>\u65b9\u6cd5\u6765\u5bf9\u7279\u5b9a\u5217\u6216\u6574\u4e2a\u6570\u636e\u6846\u8fdb\u884c\u56db\u4f4d\u5c0f\u6570\u7684\u4fdd\u7559\u3002\u53ef\u4ee5\u8fd9\u6837\u505a\uff1adf['column_name'] = df['column_name'].round(4)<\/code>\uff0c\u8fd9\u6837\u53ef\u4ee5\u786e\u4fdd\u6570\u636e\u6846\u4e2d\u6307\u5b9a\u5217\u7684\u6240\u6709\u6570\u503c\u90fd\u4fdd\u7559\u56db\u4f4d\u5c0f\u6570\u3002\u5982\u679c\u9700\u8981\u5bf9\u6574\u4e2a\u6570\u636e\u6846\u56db\u820d\u4e94\u5165\uff0c\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528df.round(4)<\/code>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\uff0c\u5bf9\u6570\u503c\u4fdd\u7559\u56db\u4f4d\u6570\u4e3b\u8981\u53ef\u4ee5\u901a\u8fc7\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u3001\u4f7f\u7528\u5185\u7f6e\u51fd\u6570round()\u3001\u4ee5\u53ca\u5e93\u51fd\u6570decima […]","protected":false},"author":3,"featured_media":1144601,"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\/1144592"}],"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=1144592"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1144592\/revisions"}],"predecessor-version":[{"id":1144603,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1144592\/revisions\/1144603"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1144601"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1144592"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1144592"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1144592"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}