rusty-snake · September 23, 2021 08:09 · Sep 23, 2021
diff --git a/truth_table.py b/truth_table.py
@@ -0,0 +1,73 @@
+#!/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
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# 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']))
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