brainf*ck interpreter

bfinterpreter.py

from sys import stdin, stdout
# state
class Int(object):
    def __init__(self, v=0): self.val = v
    def set(self, v): self.val = v; return self.val
    def inc(self): self.val += 1; return self.val
    def dec(self): self.val -= 1; return self.val
mem = [Int() for i in range(255)]
stk = []
ptr = Int()
idx = Int(-1)
# procedure
proc = {
    '+': lambda: mem[ptr.val].inc(),
    '-': lambda: mem[ptr.val].dec(),
    '>': lambda: ptr.inc(),
    '<': lambda: ptr.dec(),
    ',': lambda: mem[ptr.val].set(ord(stdin.read(1))),
    '.': lambda: stdout.write(chr(mem[ptr.val].val)),
    '[': lambda: stk.append(idx.val),
    ']': lambda: mem[ptr.val].val != 0 and idx.set(stk[-1]) or stk.pop(),
}
# interpret
bfprog = stdin.read()
while len(bfprog) != idx.inc():
    proc.get(bfprog[idx.val], lambda:1)()