combining 2 dataframes pandas
df_3 = pd.concat([df_1, df_2])
how to merge two dataframes
df_merge_col = pd.merge(df_row, df3, on='id')
df_merge_col
pandas merge multiple dataframes
import pandas as pd
from functools import reduce
# compile the list of dataframes you want to merge
data_frames = [df1, df2, df3]
df_merged = reduce(lambda left,right: pd.merge(left,right,on=['key_col'],
how='outer'), data_frames)
python dataframe left join
>>> left.merge(right, on='user_id', how='left')
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