PythonSnippets.Dev
A curated list of good to know Python Snippets. Visit PythonSnippets.dev.
Advertise with us
python-tips   0   16118
Python easter egg - import this and the joke

Python has an easter egg. If you run import this on python interpreter, the Zen of Python is printed.

rana@brahma:~$ python3.9
Python 3.9.7 (default, Sep  9 2021, 23:20:13) 
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import this
The Zen of Python, by Tim Peters

Beautiful is better than ugly.
Explicit is better than implicit.
Simple is better than complex.
Complex is better than complicated.
Flat is better than nested.
Sparse is better than dense.
Readability counts.
Special cases aren't special enough to break the rules.
Although practicality beats purity.
Errors should never pass silently.
Unless explicitly silenced.
In the face of ambiguity, refuse the temptation to guess.
There should be one-- and preferably only one --obvious way to do it.
Although that way may not be obvious at first unless you're Dutch.
Now is better than never.
Although never is often better than *right* now.
If the implementation is hard to explain, it's a bad idea.
If the implementation is easy to explain, it may be a good idea.
Namespaces are one honking great idea -- let's do more of those!
>>> 


The Zen of Python is a collection of 19 "guiding principles" for writing computer programs that influence the design of the Python programming language. Software engineer Tim Peters wrote this set of principles and posted it on the Python mailing list in 1999.


Now if you see the source code of this.py file, which you can locate in directory /usr/lib/python on your Linux machine, you will find that the source code disobeys all the guiding principles mentioned in the Zen of Python.


Source Code (python3.9):

s = """Gur Mra bs Clguba, ol Gvz Crgref

Ornhgvshy vf orggre guna htyl.
Rkcyvpvg vf orggre guna vzcyvpvg.
Fvzcyr vf orggre guna pbzcyrk.
Pbzcyrk vf orggre guna pbzcyvpngrq.
Syng vf orggre guna arfgrq.
Fcnefr vf orggre guna qrafr.
Ernqnovyvgl pbhagf.
Fcrpvny pnfrf nera'g fcrpvny rabhtu gb oernx gur ehyrf.
Nygubhtu cenpgvpnyvgl orngf chevgl.
Reebef fubhyq arire cnff fvyragyl.
Hayrff rkcyvpvgyl fvyraprq.
Va gur snpr bs nzovthvgl, ershfr gur grzcgngvba gb thrff.
Gurer fubhyq or bar-- naq cersrenoyl bayl bar --boivbhf jnl gb qb vg.
Nygubhtu gung jnl znl abg or boivbhf ng svefg hayrff lbh'er Qhgpu.
Abj vf orggre guna arire.
Nygubhtu arire vf bsgra orggre guna *evtug* abj.
Vs gur vzcyrzragngvba vf uneq gb rkcynva, vg'f n onq vqrn.
Vs gur vzcyrzragngvba vf rnfl gb rkcynva, vg znl or n tbbq vqrn.
Anzrfcnprf ner bar ubaxvat terng vqrn -- yrg'f qb zber bs gubfr!"""

d = {}
for c in (65, 97):
    for i in range(26):
        d[chr(i+c)] = chr((i+13) % 26 + c)

print("".join([d.get(c, c) for c in s]))

This code is ugly, complex, unreadable, and impractical. Also duplicating the built-in rot13 codec.

Everything the module does, from obfuscating the source code to implementing rot13 from scratch even though it's built into the stdlib, directly violates the Zen of Python





python-tips   0   16118

Related Articles:
Difference between list, set and tuples in Python and more such comparisons
Difference between tuples and lists, raw_input and input, shallow and deep copy, args and kwargs and other different terms explained in python...
5 common mistakes made by beginner python programmers
Most common mistakes made by beginner python programmers, Things to avoid by python programmers, Most common pitfalls/ gotchas in python, Bitten by python scenarios, tips for beginner python programmers, python beginner programmers should avoud these mistakes...
Print statement in Python vs other programming languages
print statement in Python vs Other programming languages, comparing python simplicity with other programming languages, how to print a string in python, print statement in python, comparing python with other languages, python vs java, python vs c++...
Solving Python Error- KeyError: 'key_name'
Solving KeyError in python, How to handle KeyError in python dictionary, Safely accessing and deleting keys from python dictionary, try except Key error in Python...

SUBSCRIBE
Please subscribe to get the latest articles in your mailbox.





DigitalOcean Referral Badge

Get a .COM for just $5.98!


© 2021-2022 Python Circle   Contact   Sponsor   Archive   Sitemap   Partner Sites: PythonSnippets.Dev  99Dev.Tools