How to Write Multiple Data Frames in an Excel Sheet

Question

How to Write Multiple Data Frames in an Excel Sheet

Della

2021年8月2日 07:23

I have multiple data frames with same column names. I want to write them together to an excel sheet stacked vertically on top of each other. And between each, there will be a text occupying a row. This is what I have in mind.

I tried the pandas.ExcelWriter() method, but each dataframe overwrites the previous frame in the sheet, instead of appending.

Note that, I still need multiple sheets for different dataframe, but also multiple dataframes on each sheet. Is it possible? Or any other python library which can dynamically generate the excel sheet from pandas dataframes?

Topic data-table dataframe excel pandas

Category Data Science

Frenchy · Accepted Answer · 2021年8月2日 07:23

an example to write in same sheet:

import pandas as pd

data1 = """
class    precision   recall 
<18      0.0125         12           
18-24    0.0250         16 
25-34    0.00350         4
"""
data2 = """
class    precision   recall 
<18      0               0           
18-24    0.25            6 
25-34    0.35            5
"""

#create 2 df for sample
df1 = pd.read_csv(pd.compat.StringIO(data1), sep='\s+')
df1.name = "Dataframe1"
df2 = pd.read_csv(pd.compat.StringIO(data2), sep='\s+')
df2.name = "Dataframe2"
print(df1);print(df2)

writer = pd.ExcelWriter('e:\\test.xlsx',engine='xlsxwriter')
workbook=writer.book
worksheet=workbook.add_worksheet('Result')
writer.sheets['Result'] = worksheet
worksheet.write_string(0, 0, df1.name)

df1.to_excel(writer,sheet_name='Result',startrow=1 , startcol=0)
worksheet.write_string(df1.shape[0] + 4, 0, df2.name)
df2.to_excel(writer,sheet_name='Result',startrow=df1.shape[0] + 5, startcol=0)
writer.save()

output:

if you want to write in different sheets:

import pandas as pd

# Create a Pandas Excel writer using XlsxWriter as the engine.
writer = pd.ExcelWriter('e:\\test.xlsx', engine='xlsxwriter')

# Write each dataframe to a different worksheet. you could write different string like above if you want
df1.to_excel(writer, sheet_name='Sheet1')
df2.to_excel(writer, sheet_name='Sheet2')

# Close the Pandas Excel writer and output the Excel file.
writer.save()

m_ocean · Accepted Answer · 2020年7月8日 09:48

Here's a universal function for writing any amount of Pandas dataframes to a single Excel sheet:

import pandas as pd

def write_dataframes_to_excel_sheet(dataframes, dir, name):
    with pd.ExcelWriter(f'{dir}/{name}.xlsx', engine='xlsxwriter') as writer:
        workbook = writer.book
        worksheet = workbook.add_worksheet('Result')
        writer.sheets['Result'] = worksheet

        COLUMN = 0
        row = 0

        for df in dataframes:
            worksheet.write_string(row, COLUMN, df.name)
            row += 1
            df.to_excel(writer, sheet_name='Result',
                        startrow=row, startcol=COLUMN)
            row += df.shape[0] + 2

Here's an example of use:

# Create sample dataframes
df1 = pd.DataFrame([(1, 2, 3), (4, 5, 6)], columns=('A', 'B', 'C'))
df1.name = "Dataframe1"
df2 = pd.DataFrame([(7, 8, 9), (10, 11, 12)], columns=('A', 'B', 'C'))
df2.name = "Dataframe2"
dataframes = (df1, df2)

write_dataframes_to_excel_sheet(dataframes, '/Users/foo/Documents', 'bar')

chacid · Accepted Answer · 2019年10月10日 06:38

Several dataframes to same sheet from here and here with selected sheet:

writer = pd.ExcelWriter('pandas_multiple.xlsx', engine='xlsxwriter')

# Position the dataframes in the worksheet.
df1.to_excel(writer, sheet_name='Sheet1')  # Default position, cell A1.
df2.to_excel(writer, sheet_name='Sheet1', startcol=3)
df3.to_excel(writer, sheet_name='Sheet1', startrow=6)

writer.save()

Itachi · Accepted Answer · 2019年3月1日 09:21

You can open the excel editor and write to it and then save

writer = pd.ExcelWriter('test.xlsx', engine='xlsxwriter')
data.to_excel(writer, sheet_name='Sheet1',
                  encoding='utf-8', index=False)
writer.save()

Please refer this answer https://stackoverflow.com/questions/34744863/python-how-to-use-excelwriter-to-write-into-an-existing-worksheet

How to Write Multiple Data Frames in an Excel Sheet

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