Answers for "df.concat python"

pandas concat and reset index

train_df = pd.concat(train_class_df_list, ignore_index=True)

concat dataframe pandas

# provide list of dataframes 
res = pd.concat([df1, df2])

dataframe concatenate

# Pandas for Python

df['col1 & col2'] = df['col1']+df['col2']

#Output
#col1	col2	col1 & col2
#A1		A2		A1A2
#B1		B2		B1B2