Learn

Good job! You’ve started with little bits, and you’ve built out an entire toolkit of logic gates you now can use to perform more complicated operations. You’re well on your way to creating an entire operating system. Watch out, Unix!

We’ve covered:

  • Bits and current
  • Truth tables
  • NAND gates
  • NOT gates
  • OR gates
  • XOR gates
  • Branching, using:
    • Multiplexers to switch between different inputs
    • Demultiplexers to turn one input into two inputs

You’ve done a great job of creating these gates from scratch in Python! All of the basic gates exist already as bitwise operators in Python. Now that you’ve done the hard work to understand how each works, you can save time by using these built-in operators:

#NOT: ~ x #E.g. ~1 == 0 and ~0 == 1 #AND: x & y #E.g. 1&1 == 1 and 1&0 == 0 #OR: x | y #E.g. 1|1 == 1 and 0|0 == 0 #XOR: x ^ y #E.g. 1^1 == 0 and 1^0 == 1

Instructions

We’ve included all the gates we covered in this lesson in script.py. Feel free to play around with them and try to make a gate of your own!

We like the Yes-And gate, or the YAND gate. It takes all the inputs, turns them into 1, and then ANDs them together.

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