Puzzle 7 A Delicious Div Sum

Pandas Brain Teasers — by Miki Tebeka (15 / 34)

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divsum.py

​ ​import​ ​pandas​ ​as​ ​pd​
​ 
​ v1 = pd.Series([0, 2, 4])
​ v2 = pd.Series([0, 1, 2])
​ out = v1 // v2
​ ​print​(out.sum())

Guess the Output

IMPORTANT

Try to guess what the output is before moving to the next page.

This code will print: 4.0

There are a few things going on in this teaser. The first is the // operator in out = v1 // v2. This is the floordiv operator in Python. Unlike the regular division, it returns an int.

​ In [1]: 7/2
​ Out[1]: 3.5
​ In [2]: 7//2
​ Out[2]: 3

The // operator is useful when you want to calculate indices (e.g., in a binary search).

The next odd thing is that we managed to divide by 0. If you try to divide by 0 in the Python shell, it’ll fail:

​ In [3]: 1/0
​ ...
​ ZeroDivisionError: division by zero