Puzzle 12 Attention Seeker

Python Brain Teasers — by Miki Tebeka (21 / 40)

👈 Click the Button | TOC | Identity Crisis 👉

seeker.py

​1: ​class​ Seeker:
​2:     ​def​ ​__getattribute__​(self, name):
​3:         ​if​ name ​not​ ​in​ self.__dict__:  
​4:             ​return​ ​'<not found>'​
​5:         ​return​ self.__dict__[name]
​6: 
​7: 
​8: s = Seeker()
​9: ​print​(s.id)

Guess the Output

IMPORTANT

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

This code will raise a RecursionError exception.

When you write s.id, Python does an attribute lookup (see puzzle 1, Puzzle 1, ​Ready Player One​). Python defines several hooks to bypass the usual attribute lookup algorithm. The two main options are __getattr__ and __getattribute__.

Other Options

INFORMATION

There are several other ways to modify attribute access such as staticmethod, classmethod, properties, descriptors, and more.