Created
October 22, 2018 20:32
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pandas_left_join_same_col
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{ | |
"cells": [ | |
{ | |
"cell_type": "code", | |
"execution_count": 1, | |
"metadata": {}, | |
"outputs": [], | |
"source": [ | |
"import pandas as pd" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 2, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"name": "stdout", | |
"output_type": "stream", | |
"text": [ | |
" col1 col2 col3\n", | |
"0 1 2 3\n", | |
"1 2 4 5\n", | |
"2 3 4 5\n", | |
" col1 col2 col3\n", | |
"0 1 2 3\n", | |
"1 2 4 4\n", | |
"2 4 5 6\n" | |
] | |
} | |
], | |
"source": [ | |
"df1 = pd.DataFrame([[1,2,3], [2,4,5], [3,4,5]], columns = ['col1', 'col2', 'col3'])\n", | |
"df2 = pd.DataFrame([[1,2,3], [2,4,4], [4,5,6]], columns = ['col1', 'col2', 'col3'])\n", | |
"print(df1); print(df2)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 4, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/html": [ | |
"<div>\n", | |
"<style scoped>\n", | |
" .dataframe tbody tr th:only-of-type {\n", | |
" vertical-align: middle;\n", | |
" }\n", | |
"\n", | |
" .dataframe tbody tr th {\n", | |
" vertical-align: top;\n", | |
" }\n", | |
"\n", | |
" .dataframe thead th {\n", | |
" text-align: right;\n", | |
" }\n", | |
"</style>\n", | |
"<table border=\"1\" class=\"dataframe\">\n", | |
" <thead>\n", | |
" <tr style=\"text-align: right;\">\n", | |
" <th></th>\n", | |
" <th>col1</th>\n", | |
" <th>col2</th>\n", | |
" <th>col3_x</th>\n", | |
" <th>col3_y</th>\n", | |
" </tr>\n", | |
" </thead>\n", | |
" <tbody>\n", | |
" <tr>\n", | |
" <th>0</th>\n", | |
" <td>1</td>\n", | |
" <td>2</td>\n", | |
" <td>3</td>\n", | |
" <td>3.0</td>\n", | |
" </tr>\n", | |
" <tr>\n", | |
" <th>1</th>\n", | |
" <td>2</td>\n", | |
" <td>4</td>\n", | |
" <td>5</td>\n", | |
" <td>4.0</td>\n", | |
" </tr>\n", | |
" <tr>\n", | |
" <th>2</th>\n", | |
" <td>3</td>\n", | |
" <td>4</td>\n", | |
" <td>5</td>\n", | |
" <td>NaN</td>\n", | |
" </tr>\n", | |
" </tbody>\n", | |
"</table>\n", | |
"</div>" | |
], | |
"text/plain": [ | |
" col1 col2 col3_x col3_y\n", | |
"0 1 2 3 3.0\n", | |
"1 2 4 5 4.0\n", | |
"2 3 4 5 NaN" | |
] | |
}, | |
"execution_count": 4, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"pd.merge(df1, df2, how = 'left', left_on = ['col1', 'col2'], right_on = ['col1', 'col2'])\n", | |
"#how = {'left', 'right', 'outer', 'inner'}, default 'inner'" | |
] | |
} | |
], | |
"metadata": { | |
"kernelspec": { | |
"display_name": "Python 3", | |
"language": "python", | |
"name": "python3" | |
}, | |
"language_info": { | |
"codemirror_mode": { | |
"name": "ipython", | |
"version": 3 | |
}, | |
"file_extension": ".py", | |
"mimetype": "text/x-python", | |
"name": "python", | |
"nbconvert_exporter": "python", | |
"pygments_lexer": "ipython3", | |
"version": "3.6.6" | |
} | |
}, | |
"nbformat": 4, | |
"nbformat_minor": 2 | |
} |
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