truth_table.py

#!/usr/bin/python3

# Copyright © 2020,2021 rusty-snake
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# SOFTWARE.

class Var:
    def __init__(self, flip_at):
        self.val = True
        self._i = 0
        self.flip_at = flip_at

    def __bool__(self):
        return self.val

    def __str__(self):
        return "1" if self.val else "0"

    def inc(self):
        if self._i < self.flip_at:
            self._i += 1
        else:
            self._i = 1
            self.val = not self.val


class TruthTable:
    def __init__(self, n):
        self.n_sq = 2 ** n
        self.vars = {}
        for i in range(1, n + 1):
            name = chr(64 + i)
            self.vars[name] = Var(self.n_sq / 2 ** i)

    def tell_me_the_truth(self, expr):
        for var in self.vars:
            print(var, end=" ")
        print("│ EXPR")
        for _ in range(1, len(self.vars) + 1):
            print("──", end="")
        print("┼─────")

        for _ in range(1, self.n_sq + 1):
            for var in self.vars:
                self.vars[var].inc()
                print(self.vars[var], end=" ")
            print("│", "1" if expr(self.vars) else "0")


def imp(p, q):
    return not p or q

if __name__ == "__main__":
    def expr(v): return (v['A'] or v['B']) and v['C']
    TruthTable(3).tell_me_the_truth(expr)

    TruthTable(4).tell_me_the_truth(lambda v: imp(v['A'], v['B']) or imp(v['C'], v['D']))