import pandas as pd
import glob as glob
files= glob.glob('./*.csv')
final_df = pd.DataFrame(index=index, columns=columns)
for file in files:
df=pd.read_csv(file)
df_filtered=df[df['tagIdent'].str.contains("e1_100")]
pd.concat([final_df, df_filtered] , axis=1)
print (final_df)
df.to_csv('filtered.csv' , sep=",")