Pandas concat and Reset Index
train_df = pd.concat(train_class_df_list, ignore_index=True)
Sachin
train_df = pd.concat(train_class_df_list, ignore_index=True)df.merge(df2, left_on = "doc_id", right_on = "doc_num", how = "left")import pandas as pd
df = pd.concat(list_of_dataframes)# Stack the DataFrames on top of each other
#survey_sub and survey_sub_last10 are both dataframes
vertical_stack = pd.concat([survey_sub, survey_sub_last10], axis=0)
# Place the DataFrames side by side
horizontal_stack = pd.concat([survey_sub, survey_sub_last10], axis=1)s1 = pd.Series(['a', 'b'])
s2 = pd.Series(['c', 'd'])
pd.concat([s1, s2])
#GIVEN THAT BOTH HAS SAME INDEX