def __init__(self, initialString=[], initialPos=0, blank="_"):
		""" The Tape uses a simple list.  It could easily be changed into a string if
		    need be """
		self.tape = []
		self.pos = initialPos
		self.blank = blank
		self.initialString = initialString
		if len(initialString) > 0:
		    for ch in initialString:
			    self.tape.append(ch)
		else:
		    self.tape.append(blank)
 The Tape uses a simple list.  It could easily be changed into a string if
		    need be 
recipes/Python/252486_Turing_Machine_Simulator/recipe-252486.py