join dataframes pandas code example
Example 1: pd merge on multiple columns
new_df = pd.merge(A_df, B_df, how='left', left_on=['A_c1','c2'], right_on = ['B_c1','c2'])
Example 2: join on column pandas
df1.merge(df2,on='columnName',how='left')
Example 3: pandas left join
df.merge(df2, left_on = "doc_id", right_on = "doc_num", how = "left")
Example 4: joins in pandas
pd.merge(product,customer,left_on='Product_name',right_on='Purchased_Product')
Example 5: append dataframe pandas
>>> df = pd.DataFrame([[1, 2], [3, 4]], columns=list('AB'))
>>> df
A B
0 1 2
1 3 4
>>> df2 = pd.DataFrame([[5, 6], [7, 8]], columns=list('AB'))
>>> df.append(df2)
A B
0 1 2
1 3 4
0 5 6
1 7 8
Example 6: joins in pandas
pd.merge(product,customer,how='inner',left_on=['Product_ID','Seller_City'],right_on=['Product_ID','City'])