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leetcode/problem/method-chaining.html

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+<pre>
+DataFrame <code>animals</code>
++-------------+--------+
+| Column Name | Type   |
++-------------+--------+
+| name        | object |
+| species     | object |
+| age         | int    |
+| weight      | int    |
++-------------+--------+
+</pre>
+
+<p>Write a solution to list the names of animals that weigh <strong>strictly more than</strong> <code>100</code> kilograms.</p>
+
+<p>Return the&nbsp;animals sorted by weight in <strong>descending order</strong>.</p>
+
+<p>The result format is in the following example.</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> 
+DataFrame animals:
++----------+---------+-----+--------+
+| name     | species | age | weight |
++----------+---------+-----+--------+
+| Tatiana  | Snake   | 98  | 464    |
+| Khaled   | Giraffe | 50  | 41     |
+| Alex     | Leopard | 6   | 328    |
+| Jonathan | Monkey  | 45  | 463    |
+| Stefan   | Bear    | 100 | 50     |
+| Tommy    | Panda   | 26  | 349    |
++----------+---------+-----+--------+
+<strong>Output:</strong> 
++----------+
+| name     |
++----------+
+| Tatiana  |
+| Jonathan |
+| Tommy    |
+| Alex     |
++----------+
+<strong>Explanation:</strong> 
+All animals weighing more than 100 should be included in the results table.
+Tatiana&#39;s weight is 464, Jonathan&#39;s weight is 463, Tommy&#39;s weight is 349, and Alex&#39;s weight is 328.
+The results should be sorted in descending order of weight.</pre>
+
+<p>&nbsp;</p>
+<p>In Pandas, <strong>method chaining</strong> enables us to&nbsp;perform operations on a DataFrame without breaking up each operation into a separate line or creating multiple temporary variables.&nbsp;</p>
+
+<p>Can you complete this&nbsp;task in just <strong>one line </strong>of code using method chaining?</p>