def interpret(source):
brackets = getBrackets(source)
inv_brackets = {v:k for k, v in brackets.items()}
t = Tape()
ind = 0
while ind < len(source):
if source[ind] == '>':
t.right()
ind += 1
elif source[ind] == '<':
t.left()
ind += 1
elif source[ind] == '+':
t.inc()
ind += 1
elif source[ind] == '-':
t.dec()
ind += 1
elif source[ind] == '.':
sys.stdout.write(t.getChar())
ind += 1
elif source[ind] == ',':
t.putChar()
ind += 1
elif source[ind] == '[':
if t.getNum() == 0:
ind = brackets[ind]
ind += 1
elif source[ind] == ']':
ind = inv_brackets[ind]
