Pyfuck -- Esoteric Python using only exc'=()%+.

How few distinct characters can we use to write and execute any python program?

We can at least do 13! [(+travels')]
We can now do it in 9! exc'=()%+ and doesn't include any numbers and only the letters required for "exec"

Inspired by:

• jsfuck
• the original pyfuck repo
• this Stackoverflow post

Usage

import pyfuck
code = pyfuck.encode_code('print("Hello World!")')

Encoding Process

TLDR: To execute any python3 string, we convert it into a sequence of chars converted from ints using the %c format string, concatenate and wrap the entire thing in exec()

Obtaining Numbers

First, we notice that ()==() evaluates to True and ()=='' evalutes to False. This allows us to build up the integers using

0: ((()=='')+(()==''))           # False+False,
1: ((()=='')+(()==()))           # False+True
2: ((()==())+(()==()))           # True+True
3: ((()==())+(()==())+(()==()))  # True+True+True

Obtaining Strings

Once we have any non-negative integer we are able to build the strings using a concatenation of single charater format strings. Ie the byte string '\x00\x01\x02' can be represented by:

'%c'%0 + '%c'%1 + '%c'%2

When we expand digits and remove spaces we get:

'%c'%((()=='')+(()==''))+'%c'%((()=='')+(()==()))+'%c'%((()==())+(()==()))

Putting it all together

Once we can encode strings we can wrap the string in exec() and execute.

To encode the simpliest python3 program '12' the following steps are taken:

1. Convert to a list of chars: ['1', '2']
2. Convert to a list of ints: [49, 50]
3. Convert to a concatenation of format strings: '%c'%49+'%c'%50
4. Expand numbers and wrap with exec():

   exec('%c'%((()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==()))+'%c'%((()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())+(()==())))

Examples

See the generate_examples.py file for the original source code

hello_world.py

print("Hello World!")

fizzbuzz.py

for fizzbuzz in range(31):
    if fizzbuzz % 3 == 0 and fizzbuzz % 5 == 0:
        print("fizzbuzz")
    elif fizzbuzz % 3 == 0:
        print("fizz")
    elif fizzbuzz % 5 == 0:
        print("buzz")
    else:
        print(fizzbuzz)