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118 lines
2.3 KiB
Markdown
118 lines
2.3 KiB
Markdown
Title: Iterating over a DataFrame
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Slug: Iterating_over_a_dataframe
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Summary: Iterating over a Pandas DataFrame with a generator
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Date: 2017-10-14 20:33
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Category: Python
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Tags: Data Wrangling
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Authors: Guillaume Redoulès
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### Create a sample dataframe
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```python
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# Import modules
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import pandas as pd
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```
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```python
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# Example dataframe
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raw_data = {'fruit': ['Banana', 'Orange', 'Apple', 'lemon', "lime", "plum"],
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'color': ['yellow', 'orange', 'red', 'yellow', "green", "purple"],
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'kcal': [89, 47, 52, 15, 30, 28]
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}
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df = pd.DataFrame(raw_data, columns = ['fruit', 'color', 'kcal'])
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df
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```
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<div>
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<style>
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.dataframe thead tr:only-child th {
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text-align: right;
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}
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.dataframe thead th {
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text-align: left;
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}
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.dataframe tbody tr th {
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vertical-align: top;
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}
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</style>
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<table border="1" class="dataframe">
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<thead>
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<tr style="text-align: right;">
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<th></th>
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<th>fruit</th>
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<th>color</th>
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<th>kcal</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<th>0</th>
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<td>Banana</td>
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<td>yellow</td>
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<td>89</td>
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</tr>
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<tr>
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<th>1</th>
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<td>Orange</td>
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<td>orange</td>
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<td>47</td>
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</tr>
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<tr>
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<th>2</th>
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<td>Apple</td>
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<td>red</td>
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<td>52</td>
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</tr>
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<tr>
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<th>3</th>
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<td>lemon</td>
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<td>yellow</td>
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<td>15</td>
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</tr>
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<tr>
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<th>4</th>
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<td>lime</td>
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<td>green</td>
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<td>30</td>
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</tr>
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<tr>
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<th>5</th>
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<td>plum</td>
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<td>purple</td>
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<td>28</td>
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</tr>
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</tbody>
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</table>
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</div>
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### Using the iterrows method
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Pandas DataFrames can return a generator with the iterrrows method. It can then be used to loop over the rows of the DataFrame
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```python
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for index, row in df.iterrows():
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print("At line {0} there is a {1} which is {2} and contains {3} kcal".format(index, row["fruit"], row["color"], row["kcal"]))
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```
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At line 0 there is a Banana which is yellow and contains 89 kcal
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At line 1 there is a Orange which is orange and contains 47 kcal
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At line 2 there is a Apple which is red and contains 52 kcal
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At line 3 there is a lemon which is yellow and contains 15 kcal
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At line 4 there is a lime which is green and contains 30 kcal
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At line 5 there is a plum which is purple and contains 28 kcal
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