pypmm.py

"""
Python Portable Minsky Machine

Implements a Python version of
https://esolangs.org/wiki/Portable_Minsky_Machine_Notation
"""

counters = {}

def inc(counter):
    counters[counter] = counters.get(counter, 0) + 1


def dec(counter):
    test = bool(counters[counter])
    counters[counter] = max(0, counters.get(counter, 0) - 1)
    return test


## Syntactic sugar
def inc_by(counter, amount):
    counters[counter] = counters.get(counter, 0) + amount


def dec_by(counter, amount):
    test = bool(counters[counter])
    counters[counter] = max(0, counters.get(counter, 0) - amount)
    return test


## I/O Extenstion

def input(counter):
    pass

def output(counter):
    if dec(counter):
        print(chr(counters[counter]))
        counters[counter] = 0


## Helper methods, not part of the original spec:
def show():
    """Shows all set registers."""
    print("Counter Value")
    for k,v in counters.items():
        print(k, v)