User:Boothby

=Interpreters=

BFP300: Big Python 300
A brainfuck interpreter in 300 bytes, written mostly in python. Will fail catastrophically on brackets left open, uses ints not bytes, array width 30k. python -c "import sys;q='q';s,p=reduce(lambda(s,p),i:(s+('\n'+' '*p+'pass\ qm[p]+=1qm[p]-=1qp+=1qp-=1qm[p]=ord(sys.stdin.read(1))qsys.stdout.write(c\ hr(m[p]))qwhile m[p]:'.split(q)[i])*(i>=0),p+(i>6)-(i==0)),map(']+-><,.['\ .find,open('$1').read),(q,0));m=[p]*30000;exec(compile(s,q,'exec'))"#BFP

PyBrain
A brainfuck interpreter in 333 bytes that doesn't resort to exec. Don't overrun the memory limit, or bad things can happen. from sys import* def f(u,c,k): while(c[-2]>=k)*u: j,u='[]><+-,.'.find(u[0]),u[1:] b=(j>=0)*(1-j%2*2);c[-2]+=b*(j<2) while b*c[c[-1]]and j<1:f(u,c,k+1);c[-2]+=1 b*=c[-2]==k;c-1,c[-1],-3][j/2-1+=b if(j==6)*b:c[c[-1]]=ord(stdin.read(1)) if(j>6)*b:stdout.write(chr(c[c[-1]])) f(open(argv[1]).read,[0]*30003,0)
 * 1) PyBrain