import pandas as pd df = pd.concat(list_of_dataframes)
train_df = pd.concat(train_class_df_list, ignore_index=True)
>>> s1 = pd.Series(['a', 'b']) >>> s2 = pd.Series(['c', 'd']) >>> pd.concat([s1, s2]) 0 a 1 b 0 c 1 d dtype: object