import pandas as pd
df1 = pd.read_excel('777.xlsx')
df2 = pd.read_excel('666.xlsx')
df = pd.concat([df1, df2])
df.to_excel('999.xlsx')
import pandas as pd
df1 = pd.read_excel('777.xlsx')
df2 = pd.read_excel('666.xlsx')
df = pd.concat([df1, df2])
df.to_excel('999.xlsx')