Turing Machine to accept the language {0^m1^m: m >= 1}

Turing.py

print "Enter string"
inp = list(raw_input()) + [' ']

R, L = lambda f:f+1, lambda f:f-1

state, i = 0, 0
machine = [{'0':[1,'X',R], 'Y':[3,'Y',R]}, {'0':[1,'0',R], 'Y':[1,'Y',R], '1':[2,'Y',L]}, {'Y':[2,'Y',L], '0':[2,'0',L], 'X':[0,'X',R]},{'Y':[3,'Y',R], ' ':[4,' ',R]},{}]

while state != 4:
    print inp[i],': State = ',state,
    try:
        state,inp[i],i = machine[state].get(inp[i])[0], machine[state].get(inp[i])[1], machine[state].get(inp[i])[2](i)
        print '->',state, "".join(inp)
    except TypeError:
        break

if state == 4:
    print "\nString accepted"
else:
    print "\nString not accepted"