Add code for 2015 advent that I did historically.

day_7/part_1.py

@@ -0,0 +1,81 @@
+from random import randint
+
+target_key = "a"
+values = {}
+
+
+tests = [
+	"123 -> x",
+	"456 -> y",
+	"x AND y -> d",
+	"x OR y -> e",
+	"x LSHIFT 2 -> f",
+	"y RSHIFT 2 -> g",
+	"NOT x -> h",
+	"NOT y -> i"
+]
+
+
+def get_operation(instr):
+	if len(instr) == 3: return "ASSIGNMENT"
+	elif len(instr) == 4: return "INVERT"
+	else: return instr[1]
+
+
+def convert_values(op_type, instr):
+
+	def to_int(key):
+		"""
+		Helper function to convert a single value in an instruction to an int
+		"""
+		try:
+			return int(key)
+		except ValueError:
+			try:
+				return values[key]
+			except KeyError:
+				return None
+
+	if op_type == "INVERT":
+		instr[1] = to_int(instr[1])
+	elif op_type == "ASSIGNMENT":
+		instr[0] = to_int(instr[0])
+	else:
+		instr[0] = to_int(instr[0])
+		instr[2] = to_int(instr[2])
+	return instr
+
+
+def execute_operation(op_type, instr):
+	target = instr[-1]
+
+	if op_type == "ASSIGNMENT": values[target] = instr[0]
+	elif op_type == "INVERT": values[target] = ~instr[1] + 2**16
+	elif op_type == "OR": values[target] = instr[0] | instr[2]
+	elif op_type == "AND": values[target] = instr[0] & instr[2]
+	elif op_type == "LSHIFT": values[target] = instr[0] << instr[2]
+	elif op_type == "RSHIFT": values[target] = instr[0] >> instr[2]
+	else: raise Exception(f"Input Error: Invalid Operation Type: {op_type}")
+
+
+def run_instruction(instr):
+	instr = instr.split(" ")
+	op_type = get_operation(instr)
+	instr = convert_values(op_type, instr)
+
+	# Ensure all operation parameters were found correctly
+	if None in instr: return False
+	execute_operation(op_type, instr)
+	return True
+
+
+with open("input", "r") as data:
+	lines = data.readlines()
+	while "a" not in values:
+
+		random_index = randint(0, len(lines) - 1)
+		success = run_instruction(lines[random_index].strip())
+		if success:
+			del lines[random_index]
+
+print(f"Value of A: {values['a']}")