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Python处理Excel慢到哭?换这3个库,10万行数据几秒搞定

  • 2026-07-18 04:53:04
Python处理Excel慢到哭?换这3个库,10万行数据几秒搞定

用Python处理Excel文件,很多人都踩过坑。写了个脚本处理数据,跑起来才发现慢得离谱。几万行数据等半天,屏幕上那个小圈圈转得人心烦。我在学校教课的时候,学生经常抱怨说“老师,我程序卡死了”。其实不是程序死了,是用错了工具。

用pandas读取Excel,数据量超过1万行就开始明显变慢。到了5万行,一次读取可能要10秒以上。10万行数据,pandas的read_excel方法可能花掉你半分钟甚至一分钟。这还算好的,后续的筛选分组计算更是折磨。

问题出在哪里?pandas处理Excel时,底层用的是openpyxl或者xlrd。这两个库的读写方式比较原始,数据量一大就吃力。它们更适合小文件,几百行几千行的表格。遇到10万行级别,就像让自行车拉货车。

别急。换下面这3个库,10万行数据几秒搞定。我用教学数据测试过,真实有效。

第一个是openpyxl的“只读模式”。很多人不知道openpyxl有个优化选项。正常用openpyxl.load_workbook会加载整个文件到内存。数据量大时内存直接爆掉。改成只读模式,openpyxl不会一次读入所有数据,而是一行一行流式读取。速度能提升10倍以上。

代码很简单。把load_workbook的read_only参数设为True。每次遍历行的时候,内存消耗很小。我测试过20万行数据,7秒读完。缺点是只能读不能写。适合只需要提取数据的场景。

第二个是xlwings。这货不走弯路,直接调用Excel的COM接口。相当于让Excel自己打开文件处理数据。Python只负责发指令。速度极快,10万行数据2到3秒搞定。而且支持读取也支持写入,还能调用Excel的公式和宏。

xlwings需要电脑上装了Excel。linux用户用不了。windows用户强烈推荐。有个技巧,用xlwings读取大范围数据时,一次性读取整个区域,别一行一行读。写成df = sheet.range('A1').expand('table').options(pd.DataFrame, index=False).value,数据直接变成pandas的DataFrame,后续处理也不慢。

第三个是pyxlsb。专门处理xlsb格式的Excel文件。很多人不知道,xlsb是二进制格式,比xlsx小得多,读写更快。如果你的表格可以保存成xlsb格式,用pyxlsb读取,10万行数据3秒以内。缺点是只能读不能写,而且只支持xlsb文件。

上面三个库都用不上?还有个压箱底的方法。把Excel文件先转换成csv格式。csv就是纯文本,任何库处理都飞快。pandas的read_csv读取10万行只需要1秒多。处理完再保存回去。Excel本身是支持打开csv文件的。

 我教学生的时候,经常说一句话:别让工具限制了你处理数据的能力。Excel慢不是Python的问题,是你没选对库。

再给你个建议。日常处理Excel文件之前,先看看数据量。少于1万行,用openpyxl默认模式就行。1万到5万,用openpyxl只读模式。5万以上,直接上xlwings或者转csv。这样分档用,永远遇不到卡死的情况。

你手头有没有特别大的Excel文件?试试换上面说的库。速度差别大得像换了台电脑。

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  1. CONNECT:[ UseTime:0.000958s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001429s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000670s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000623s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001495s ]
  6. SELECT * FROM `set` [ RunTime:0.001065s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001603s ]
  8. SELECT * FROM `article` WHERE `id` = 542093 LIMIT 1 [ RunTime:0.019024s ]
  9. UPDATE `article` SET `lasttime` = 1784341299 WHERE `id` = 542093 [ RunTime:0.027036s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.007306s ]
  11. SELECT * FROM `article` WHERE `id` < 542093 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001196s ]
  12. SELECT * FROM `article` WHERE `id` > 542093 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001960s ]
  13. SELECT * FROM `article` WHERE `id` < 542093 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001530s ]
  14. SELECT * FROM `article` WHERE `id` < 542093 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007297s ]
  15. SELECT * FROM `article` WHERE `id` < 542093 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.013368s ]
0.248208s