将值写入python中pandas中工作表中的特定单元格

Question

我有一张excel表,在某些单元格中已有一些值.

例如: -

        A      B      C      D
1      val1   val2          val3
2             valx   valy        

我想要大熊猫写入特定的细胞而不接触任何其他细胞,薄片等

这是我试过的代码.

import pandas as pd
from openpyxl import load_workbook

df2 = pd.DataFrame({'Data': [13, 24, 35, 46]})
book = load_workbook('b.xlsx')
writer = pd.ExcelWriter('b.xlsx', engine='openpyxl')

df2.to_excel(writer, "Sheet1", startcol=7,startrow=6)

writer.save()

但是,此代码会删除较旧的单元格值.

我已经提到: - 如何写入现有的excel文件而不覆盖数据(使用pandas)？ 但这个解决方案不起作用.

Answer 1

UPDATE2:将数据附加到现有Excel工作表,保留其他(旧)工作表:

import pandas as pd
from openpyxl import load_workbook

fn = r'C:\Temp\.data\doc.xlsx'

df = pd.read_excel(fn, header=None)
df2 = pd.DataFrame({'Data': [13, 24, 35, 46]})

writer = pd.ExcelWriter(fn, engine='openpyxl')
book = load_workbook(fn)
writer.book = book
writer.sheets = dict((ws.title, ws) for ws in book.worksheets)

df.to_excel(writer, sheet_name='Sheet1', header=None, index=False)
df2.to_excel(writer, sheet_name='Sheet1', header=None, index=False,
             startcol=7,startrow=6)

writer.save()

更新:您的Excel文件没有标题,因此您应该相应地处理它:

In [57]: df = pd.read_excel(fn, header=None)

In [58]: df
Out[58]:
     0    1
0  abc  def
1  ghi  lmn

In [59]: df2
Out[59]:
   Data
0    13
1    24
2    35
3    46

In [60]: writer = pd.ExcelWriter(fn)

In [61]: df.to_excel(writer, header=None, index=False)

In [62]: df2.to_excel(writer, startcol=7,startrow=6, header=None, index=False)

In [63]: writer.save()

老答案:

您可以使用以下技巧:

首先将excel文件的现有内容读入新DF:

In [17]: fn = r'C:\Temp\b.xlsx'

In [18]: df = pd.read_excel(fn)

In [19]: df
Out[19]:
       A      B     C      D
0   val1    NaN  val3   val4
1  val11  val22   NaN  val33

现在我们可以把它写回来并添加一个新的DF2:

In [20]: writer = pd.ExcelWriter(fn)

In [21]: df.to_excel(writer, index=False)

In [22]: df2.to_excel(writer, startcol=7,startrow=6, header=None)

In [23]: writer.save()

Answer 2

我无法通过使用熊猫来完成我在问题中提出的问题，但能够通过使用Openpyxl.

我将编写一些有助于实现所要求的代码片段。

import openpyxl

srcfile = openpyxl.load_workbook('docname.xlsx',read_only=False, keep_vba= True)#to open the excel sheet and if it has macros

sheetname = srcfile.get_sheet_by_name('sheetname')#get sheetname from the file
sheetname['B2']= str('write something') #write something in B2 cell of the supplied sheet
sheetname.cell(row=1,column=1).value = "something" #write to row 1,col 1 explicitly, this type of writing is useful to write something in loops

srcfile.save('newfile.xlsm')#save it as a new file, the original file is untouched and here I am saving it as xlsm(m here denotes macros).

所以 Openpyxl 写入一个特定的单元格，而不触及其他工作表、单元格等。它基本上写入一个尊重原始文件属性的新文件