如何使用pandas python附加for循环的所有输出

Question

I have an excel file (df2) and i have used for loop to it to get multiple outputs and then i want to append all the multiple outputs obtained for that file so that i can get it into one single excel. Please find my code below and suggest some ideas so that i can complete my code.

import os
from os import path
import pandas as pd

src = "C:\\ASPAIN-ORANGE\\test_wind3\\udc\\folder\\"

df = pd.read_excel('check_.xlsx',sheet_name='Align_pivot')
files = [i for i in os.listdir(src) if i.startswith("_Verification_") and path.isfile(path.join(src, i))]
for f in files:
    slice1 = 19
    file_slice = f[slice1:].replace(".csv", "")
    df1 = pd.read_csv(f)
    total_rows_df1 = len(df1.axes[0])
    df2 = df[df['MO'] == (file_slice)]
    total_rows_df2 = sum(df2.To_Align)
    print("filename : "+str(file_slice))
    print("Number of Rows_df1: "+str(total_rows_df1))
    print("Number of Rows_df2: "+str(total_rows_df2))
    if total_rows_df1 == total_rows_df2:
        print('True')
    else:
        print('False')
    df2.to_excel('output.xlsx', index=False, na_rep = 'NA', header = True)

1st Iteration output

2nd Iteration output

3rd Iteration output

and so on

Final appended Output

Your kind help would really be appreciated.

Answer 1

You can use DataFrame.append method (Append rows of other to the end of caller, returning a new object):

df = df.append(sheet, ignore_index=True)

Once all rows are added you can call to_excel method to write the excel.

https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.append.html