import pandas as pd
import glob

all_data = pd.DataFrame()
for f in glob.glob("name*.xlsx"):
    df = pd.read_excel(f)
    all_data = all_data.append(df,ignore_index=True)
    all_data = all_data[df.columns]

ndexNames = all_data[ (all_data['Stat 01'] == 90) & (all_data['Stat 01'] == 9) ].index

all_data.drop(indexNames , inplace=True)
all_data.dropna(subset=['Stat 03'], how='any')

all_data.to_excel('done.xlsx', index=False)