How it is possible to write obfuscated oneliners in Python?

Yes, it is possible to write obfuscated one-liners in Python using Lambda. Before moving further, let us first understand what are Lambdas in Python.

Python Lambda

The Lambda expressions allow defining anonymous functions. A lambda function is an anonymous function i.e. a function without a name. Let us see the syntax −

lambda arguments: expressions

The keyword lambda defines a lambda function. A lambda expression contains one or more arguments, but it can have only one expression.

Example

Let us see an example −

myStr = "Thisisit!"
(lambda myStr : print(myStr))(myStr)

Output

Thisisit!

Merge Elements in a Python List using Lambda

To merge elements using Lambda, we will use the reduce() method. The reduce() is part of the functools module in Python. Let us first learn to install and use the functools module −

Install the functools module;

pip install functools

Use the functools module −

import functools

Example

Following is the code −

import functools

# List
myList = ['H', 'O', 'W', 'A', 'R', 'E', 'Y', 'O', 'U']

# Display the List
print("List = " + str(myList))

# Merge items using Lambda
myList[0: 3] = [functools.reduce(lambda i, j: i + j, myList[0: 3])]

# Displaying the Result
print("Result = " + str(myList))

Output

List = ['H', 'O', 'W', 'A', 'R', 'E', 'Y', 'O', 'U']
Result = ['HOW', 'A', 'R', 'E', 'Y', 'O', 'U']

The same functools module will now be used to write obfuscated one-liners in Python. With that, the reduce() method of the functools module is also used −

One-Liner Obfuscated code for Prime Numbers

Example

Let us now see an example of one-liner obfuscated code for prime number using the functools module −

from functools import reduce

# Primes < 500
print(list(filter(None,map(lambda y:y*reduce(lambda x,y:x*y!=0,
map(lambda x,y=y:y%x,range(2,int(pow(y,0.5)+1))),1),range(2,500)))))

Output

[2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499]

One-Liner Obfuscated code for Fibonacci

Example

Let us now see an example of one-liner obfuscated code for first 20 Fibonacci numbers using the functools module −

from functools import reduce

# First 20 Fibonacci numbers
print(list(map(lambda x,f=lambda x,f:(f(x-1,f)+f(x-2,f)) if x>1 else 1:
f(x,f), range(20))))

Output

[1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181, 6765]

One-Liner Obfuscated code for Mandelbrot

Example

Let us now see an example of one-liner obfuscated code for Mandelbrot Set using the functools module −

from functools import reduce

# Mandelbrot set
print((lambda Ru,Ro,Iu,Io,IM,Sx,Sy:reduce(lambda x,y:x+y,map(lambda y,
Iu=Iu,Io=Io,Ru=Ru,Ro=Ro,Sy=Sy,L=lambda yc,Iu=Iu,Io=Io,Ru=Ru,Ro=Ro,i=IM,
Sx=Sx,Sy=Sy:reduce(lambda x,y:x+y,map(lambda x,xc=Ru,yc=yc,Ru=Ru,Ro=Ro,
i=i,Sx=Sx,F=lambda xc,yc,x,y,k,f=lambda xc,yc,x,y,k,f:(k<=0)or (x*x+y*y
>=4.0) or 1+f(xc,yc,x*x-y*y+xc,2.0*x*y+yc,k-1,f):f(xc,yc,x,y,k,f):chr(
64+F(Ru+x*(Ro-Ru)/Sx,yc,0,0,i)),range(Sx))):L(Iu+y*(Io-Iu)/Sy),range(Sy
))))(-2.1, 0.7, -1.2, 1.2, 30, 80, 24))

# \___ ___/ \___ ___/ | | |__ lines on screen
# V V | |______ columns on screen
# | | |__________ maximum of "iterations"
# | |_________________ range on y axis
# |____________________________ range on x axis

output

BBBBBBBBBBBBBBBCCCCCCCCCCCCCDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDCCCCCCCCCCCCCCCBBBBBBBBBBBBBCCCCCCCCCDDDDDDDDDDDDDDDDDDDDDDDDEEEEEEFGJJHFFFEEEEEDDDDDCCCCCCCCCCBBBBBBBBBBBCCCCCCCDDDDDDDDDDDDDDDDDDDDDDDEEEEEEEEEFFFGHJPJKL_FEEEEEEDDDDDDDCCCCCBBBBBBBBBCCCCCCDDDDDDDDDDDDDDDDDDDDDDEEEEEEEEEEFFFFGHIJZR_QJIGFFFEEEEEEDDDDDDDCCBBBBBBBBCCCCDDDDDDDDDDDDDDDDDDDDDDEEEEEEEEEEFFFGGGHIKP______SKHGFFFFFEEEEDDDDDDDBBBBBBBCCCDDDDDDDDDDDDDDDDDDDDEEEEEEEEEFFFHHIXIIIIJKLO______NKJJIHGGGHSGFEEDDDDDBBBBBBCCDDDDDDDDDDDDDDDDDDDEEEEEFFFFFFFGGHIM___R_________________PLN[SQXIFEEDDDDBBBBBCDDDDDDDDDDDDDDDDEEEFFFFFFFFFFFGGGHIKMNS_________________________UIGGFEEDDDBBBBBDDDDDDDDDDEEEEEFFGHOIHHHHHHHHHHHHIJLP____________________________RKJPGFEEDDBBBBDDDDEEEEEEEEEFFFFGGHJM___LNW_ONKJJKNY______________________________SKHGFEEEDBBBBDEEEEEEEEEFFFFFFGHHJLOT__________QPZ_________________________________HFFEEEEBBBDEEEEEEEFGGGGHHHJM_QNS______________________________________________[HGFFEEEEBBB_________________________________________________________________QLIHGFFFEEEEBBBDEEEEEEEFGGGGHHHJM_QNS______________________________________________[HGFFEEEEBBBBDEEEEEEEEEFFFFFFGHHJLOT__________QPZ_________________________________HFFEEEEBBBBDDDDEEEEEEEEEFFFFGGHJM___LNW_ONKJJKNY______________________________SKHGFEEEDBBBBBDDDDDDDDDDEEEEEFFGHOIHHHHHHHHHHHHIJLP____________________________RKJPGFEEDDBBBBBCDDDDDDDDDDDDDDDDEEEFFFFFFFFFFFGGGHIKMNS_________________________UIGGFEEDDDBBBBBBCCDDDDDDDDDDDDDDDDDDDEEEEEFFFFFFFGGHIM___R_________________PLN[SQXIFEEDDDDBBBBBBBCCCDDDDDDDDDDDDDDDDDDDDEEEEEEEEEFFFHHIXIIIIJKLO______NKJJIHGGGHSGFEEDDDDDBBBBBBBBCCCCDDDDDDDDDDDDDDDDDDDDDDEEEEEEEEEEFFFGGGHIKP______SKHGFFFFFEEEEDDDDDDDBBBBBBBBBCCCCCCDDDDDDDDDDDDDDDDDDDDDDEEEEEEEEEEFFFFGHIJZR_QJIGFFFEEEEEEDDDDDDDCCBBBBBBBBBBBCCCCCCCDDDDDDDDDDDDDDDDDDDDDDDEEEEEEEEEFFFGHJPJKL_FEEEEEEDDDDDDDCCCCCBBBBBBBBBBBBBCCCCCCCCCDDDDDDDDDDDDDDDDDDDDDDDDEEEEEEFGJJHFFFEEEEEDDDDDCCCCCCCCCC