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Python 文件操作:Excel 格式(.xlsx)

  • 2026-03-31 20:07:50
Python 文件操作:Excel 格式(.xlsx)

Excel 文件(通常为 .xlsx)是一种基于 XML 的压缩容器格式,用于存储结构化表格数据、工作表、样式、公式与图表等信息。

与 CSV 的“纯文本、单表”不同,Excel 文件支持:

• 多工作表(Sheet)

• 单元格类型(数值、文本、日期、布尔值)

• 公式与格式

• 合并单元格、样式、筛选等结构信息

因此,Excel 更适合结构复杂、需要格式与计算逻辑的表格数据存储。

一、Excel 文件格式基础

1、常见扩展名

.xlsx:现代 Excel 格式(Office 2007+)

.xls:旧版二进制格式

.xlsm:含宏的 Excel 文件

推荐统一使用 .xlsx

2、Excel 文件的结构特征

• 一个文件可包含多个工作表(Sheet)

• 单元格具有明确数据类型

• 支持公式(如 =SUM(A1:A10))

• 支持样式、列宽、冻结窗格等

• 实际上是一个 ZIP 压缩包(包含 XML 文件)

二、在 Python 中表示 Excel 数据

Excel 本质仍然是“二维表格结构”,因此在 Python 中通常以以下结构表示:

1、使用列表与字典表示表格

students = [    {"id"1"姓名""张三""成绩"95},    {"id"2"姓名""李四""成绩"88},    {"id"3"姓名""王五""成绩"90},    {"id"4"姓名""赵六""成绩"70},]

这种结构与 Excel 的“行–列”天然对应。

2、使用二维列表表示单个工作表

table = [    ["id""姓名""成绩"],    [1, "张三", 95],    [2, "李四", 88],    [3, "王五", 90],    [4, "赵六", 70],]

适用于 openpyxl 等库逐单元格写入。

三、使用 openpyxl 操作 Excel 文件

Python 标准库不支持 Excel 文件,需要第三方库。

推荐使用:

• openpyxl(读写 .xlsx)

• pandas(数据分析场景)

1、安装 openpyxl/pandas

pip install openpyxl pandas

2、创建并写入 Excel 文件

from openpyxl import Workbook# 创建工作簿wb = Workbook()ws = wb.activews.title = "Students"# 写入表头ws.append(["id""姓名""成绩"])# 写入数据ws.append([1"张三"95])ws.append([2"李四"88])ws.append([3"王五"90])# 保存文件wb.save("students1.xlsx")print("students1.xlsx 文件已保存。")

说明:

• Workbook() 创建工作簿对象

• ws.append() 按行写入

• wb.save() 保存文件

3、读取 Excel 文件

from openpyxl import load_workbookwb = load_workbook("students1.xlsx")ws = wb["Students"]for row in ws.iter_rows(values_only=True):    print(row)

输出:

('id''姓名''成绩')(1'张三'95)(2'李四'88)(3'王五'90)

values_only=True 表示直接返回单元格值。

4、多工作表操作

wb.create_sheet("Summary")wb.save("students1.xlsx")

一个 Excel 文件可包含多个数据表。

四、使用 pandas 处理 Excel 文件

在数据分析场景中,通常优先使用 pandas。

pandas 在读取 .xlsx 时默认使用 openpyxl 作为后端引擎。

1、读取 Excel 文件

import pandas as pddf = pd.read_excel("students1.xlsx")print(df.head())

输出:

   id  姓名  成绩0   1  张三  951   2  李四  882   3  王五  90

2、指定工作表读取

df = pd.read_excel("students1.xlsx", sheet_name="Students")

3、筛选与统计

top = df[df["成绩"] >= 90]avg = df["成绩"].mean()print(top)print("平均分:", avg)

4、写入 Excel 文件

top.to_excel("top_students1.xlsx"index=False)

与 CSV 相比,Excel 格式具有以下差异

• .xlsx 文件为二进制容器格式,不涉及文本编码参数

• 支持写入多个 Sheet

5、写入多个工作表

with pd.ExcelWriter("report.xlsx"as writer:    df.to_excel(writer, sheet_name="All")    top.to_excel(writer, sheet_name="Top")

ExcelWriter 用于创建多 Sheet 文件。

五、综合案例:完整 Excel 数据流程

流程:构造 → 写入 → 读取 → 筛选 → 输出

import pandas as pd# 1. 构造数据students = [    {"id"1"姓名""张三""成绩"95},    {"id"2"姓名""李四""成绩"88},    {"id"3"姓名""王五""成绩"90},    {"id"4"姓名""赵六""成绩"70},]# 2. 转为 DataFramedf = pd.DataFrame(students)# 3. 保存 Excel 文件df.to_excel("students.xlsx", index=False)# 4. 读取文件df2 = pd.read_excel("students.xlsx")# 5. 筛选top = df2[df2["成绩"] >= 85]# 6. 写入新文件top.to_excel("top_students.xlsx", index=False)print("处理完成。")

六、性能与注意事项

1、Excel 为 XML 结构 + 压缩容器,解析成本高于纯文本 CSV。

2、多 Sheet 文件建议使用 pandas。

3、避免频繁逐单元格写入(性能低)。

4、不建议用 Excel 存储百万级数据。

5、若涉及公式,请确认是否需要保留公式或计算结果。

📘 小结

Excel 文件支持多表、多类型与公式,适合报表与结构化数据管理。Python 中推荐使用 openpyxl 进行底层读写,使用 pandas 进行分析与批量处理。在工程实践中,应根据数据规模与使用场景选择 CSV 或 Excel,以兼顾兼容性、性能与结构表达能力。

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  1. CONNECT:[ UseTime:0.000593s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000866s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000323s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000274s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000600s ]
  6. SELECT * FROM `set` [ RunTime:0.000265s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000689s ]
  8. SELECT * FROM `article` WHERE `id` = 480550 LIMIT 1 [ RunTime:0.010016s ]
  9. UPDATE `article` SET `lasttime` = 1775400224 WHERE `id` = 480550 [ RunTime:0.006569s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000798s ]
  11. SELECT * FROM `article` WHERE `id` < 480550 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001389s ]
  12. SELECT * FROM `article` WHERE `id` > 480550 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000461s ]
  13. SELECT * FROM `article` WHERE `id` < 480550 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001023s ]
  14. SELECT * FROM `article` WHERE `id` < 480550 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000926s ]
  15. SELECT * FROM `article` WHERE `id` < 480550 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002666s ]
0.099039s