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Write a program in Python to merge two dataframes based on matching data in a column
Assume, you have two dataframe,
first dataframe is id country 0 1 India 1 2 UK 2 3 US 3 4 China second dataframe is id City 0 1 Chennai 1 11 Cambridge 2 22 Chicago 3 4 Chengdu
And the result for merging based on same column is,
Merging data based on same column - id id country City 0 1 India Chennai 1 4 China Chengdu
Solution
To solve this, we will follow the steps given below −
Define a two dataframes
Merge two dataframes based on the same column id is defined below,
pd.merge(first_df,second_df,how='inner',on='id')
Example
Let us see the following implementation to get a better understanding −
import pandas as pd
import numpy as np
first_df = pd.DataFrame({'id':[1,2,3,4], 'country':['India','UK','US','China']
})
print("first dataframe is\n", first_df)
second_df = pd.DataFrame({'id':[1,11,22,4], 'City' : ['Chennai','Cambridge','Chicago','Chengdu']
})
print("second dataframe is\n", second_df)
print("Merging data based on same column - id")
print(pd.merge(first_df,second_df,how='inner',on='id'))Output
first dataframe is id country 0 1 India 1 2 UK 2 3 US 3 4 China second dataframe is id City 0 1 Chennai 1 11 Cambridge 2 22 Chicago 3 4 Chengdu Merging data based on same column - id id country City 0 1 India Chennai 1 4 China Chengdu
Updated on: 24-Feb-2021
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