writing pandas data frame to existing workbook

Question

I want to save a data frame to the second sheet of a file but I can't do that and I don't know why.

yfile = openpyxl.load_workbook(new_file, data_only=True) 
ws = yfile.worksheets[0] 
sheet2 = yfile.create_sheet() 
ws2 = yfile.get_sheet_by_name("Sheet").title = "Analysis" 
writer = pd.ExcelWriter(yfile, engine='xlsxwriter') 
df3.to_excel(writer, sheet_name='Analysis') 
writer.save()
yfile.save(new_file)                                          

I have created the sheet 'Analysis' but when I save in it I received the following response: "AttributeError: 'Workbook' object has no attribute 'write'"

What I have to modify?

Answer 1

You can use the append_df_to_excel() helper function, which is defined in this answer:

Demo:

In [127]: df = pd.DataFrame(np.random.rand(5, 3), columns=list('abc'))

In [128]: df
Out[128]:
          a         b         c
0  0.597353  0.770586  0.671231
1  0.628605  0.161283  0.397493
2  0.476206  0.701582  0.476809
3  0.045590  0.302834  0.857033
4  0.414820  0.478016  0.563258

In [129]: df.to_excel(filename)

In [130]: append_df_to_excel(filename, df, sheet_name="Sheet2", startrow=1, startcol=1)

In [131]: append_df_to_excel(filename, df, sheet_name="Sheet3", index=False)

In [132]: append_df_to_excel(filename, df, sheet_name="Sheet1", startcol=2, index=False)

---

Result:

Sheet1:

Sheet2:

Sheet3:

PS tested using the following versions:

• python: 3.6.4
• pandas: 0.22.0
• openpyxl: 2.4.10

Answer 2

You can use such way as below. It writes dataframe to an excel-file row by row.

from openpyxl.utils.dataframe import dataframe_to_rows
filename = r'some_file.xlsx'
df = some_dataframe

wb = load_workbook(filename)
if 'sh2' in wb.sheetnames:#to check whether sheet you need already exists
    ws = wb['sh2']
else:
    ws = wb.active
for r in dataframe_to_rows(df, index=False, header=True):
    ws.append(r)
wb.save(filename)