I think I might have to reinvent the wheel...

.gitignore

@@ -0,0 +1,2 @@
+
+.dir-locals.el

work.py

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+class nBit:
+    def __init__(self, bitlength):
+        self.bitlength = bitlength
+        self.registers = {"a": 0}
+        self.carry_status = 0
+
+    def create_register(self, name):
+        self.registers[name] = 0
+
+    def set_register(self, name, v):
+        self.check(v)
+        self.registers[name] = v
+
+    def get_register(self, name):
+        return self.registers[name]
+
+    def check(self, n):
+        if n.bitlength > self.bitlength:
+            raise OverflowError
+
+    def maybe_carry(self):
+        if self.registers["a"].bit_length() > self.bitlength:
+            self.registers["a"] &= 1 << self.bitlength - 1
+            self.carry_status
+
+    def add(self, v):
+        self.registers["a"] += v
+        self.maybe_carry()
+
+    def shift_right(self):
+        self.registers["a"] >>= 1
+        if self.carry_status == 1:
+            self.registers["a"] &= 1 << self.carry_status
+
+    def shift_left(self):
+        self.registers["a"] <<= 1
+        self.maybe_carry()