funky recursive lambda from https://gist.github.com/ooliver1/f92f6a1dd8373b2e3911fdc5eca708b6

recursive_lambda.py

(lambda a: lambda v: a(a, v))(lambda f, value: f(f, value * 2))(initial)

recursive_lambda_example.py

print(int(((lambda a: lambda v: a(a, v))(lambda f, stuff: f(f, [[digits for digits in stuff[0] if digits[stuff[1]] == (max({v[stuff[1]] for v in stuff[0]}, key=[v[stuff[1]] for v in stuff[0]].count) if [v[stuff[1]] for v in stuff[0]].count("0") != [v[stuff[1]] for v in stuff[0]].count("1") else "1")], stuff[1] + 1]) if len([digits for digits in stuff[0]if digits[stuff[1]] == (max({v[stuff[1]] for v in stuff[0]}, key=[v[stuff[1]] for v in stuff[0]].count) if [v[stuff[1]] for v in stuff[0]].count("0") != [v[stuff[1]] for v in stuff[0]].count("1") else "1")]) != 0 and stuff[1] < 12 else stuff[0]))([list(open("input3.txt").readlines()), 0])[0], base=2) * int(((lambda a: lambda v: a(a, v))(lambda f, stuff: f(f, [[digits for digits in stuff[0] if digits[stuff[1]] == (min({v[stuff[1]] for v in stuff[0]}, key=[v[stuff[1]] for v in stuff[0]].count) if [v[stuff[1]] for v in stuff[0]].count("0") != [v[stuff[1]] for v in stuff[0]].count("1") else "0")], stuff[1] + 1]) if len([digits for digits in stuff[0] if digits[stuff[1]] == (min({v[stuff[1]] for v in stuff[0]}, key=[v[stuff[1]] for v in stuff[0]].count) if [v[stuff[1]] for v in stuff[0]].count("0") != [v[stuff[1]] for v in stuff[0]].count("1") else "0")]) != 0 and stuff[1] < 12 else stuff[0]))([list(open("input3.txt").readlines()), 0])[0], base=2))
# https://adventofcode.com/2021/day/3 i think

recursive_lambda_multiple_inputs.py

(lambda a: lambda *v: a(a, v))(lambda f, value, value2: f(f, value * 2 + value2, value2))(initial)

recursive_lambda_multiple_inputs_example.py

print((lambda a: lambda *v: a(a, *v))(lambda f, a, b: a if b == 1 else a ** f(f, a, b - 1))(3, 3))
# https://en.wikipedia.org/wiki/Knuth%27s_up-arrow_notation#Introduction

slightly_more_verbose.py

(   # 1 - called with the 2nd part then 3rd to call 2nd with itself and 3rd
    lambda function: lambda value: function(function, value)
)(  # 2 - called with itself and the 3rd part and returns calling itself
    lambda function, value: function(function, value * 2)
)(  # 3 - the actual initial value
    value
)