obfuscates python code to only use 8 characters, aside from one pre-defined function

onefunc.py

# 8 characters:  _ ~ + , ( ) [ ] and 1 function
# code.py is the original code
# obf.py is the obfuscated code

def _(s=None,a=0):
	if isinstance(s, str):
		try:
			if a == 0:
				exec(s)
			elif a == 1:
				return eval(s)
		except Exception as e:
			return repr(e)
	elif s == 0:
		return '0'
	elif s == None:
		return True
	elif s == -2:
		return False
	elif s == False:
		return None
	else:
		return str(s)

def nto_(n):
	return ("_()+"*n)[:-1] if n > 0 else "~_()+~~_()+~~_()"

def pnto_(n):
	l = str(n)
	t = []
	
	if n == 1:
		return "_(~(~_()+_())+_())"
	
	for i in range(len(l)):
		t.append("_("+nto_(int(l[i]))+")")
	
	return '+'.join(t)

def sto_(s):
	t = []
	
	for i in s:
		if i in ['(', ')', '[', ']']:
			t.append("_([()])["+nto_(_([()]).index(i))+"]")
		elif i in ['e', 'r']:
			t.append("_(_(_)[_()])["+nto_(_(_(_)[_()]).index(i))+"]")
		elif i in ['a', ' ', 'c', 'f', 'o', 'n', 'i', '_']:
			t.append("_(_)["+nto_(_(_).index(i))+"]")
		elif i in ['g', ',']:
			t.append("_(_(())[_()])["+nto_(_(_(())[_()]).index(i))+"]")
		elif i in "0123456789":
			t.append(pnto_(int(i)))
		elif i == "h":
			t.append("_(_(_)[_()+_()+_()+_()+_()+_()+_()+_()+_()+_()]+_([()])[_()]+_(_)[_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()]+_(_)[_()+_()+_()+_()+_()+_()+_()+_()+_()]+_(_)[_()]+_(_)[_()+_()+_()+_()+_()+_()+_()]+_(_(_)[_()])[_()+_()+_()+_()+_()]+_(_)[_()+_()+_()+_()+_()+_()+_()+_()+_()]+_(_)[_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()]+_(_)[_()+_()+_()+_()+_()+_()+_()+_()+_()]+_(_)[_()+_()+_()+_()+_()+_()]+_(_)[_()+_()+_()]+_(_)[_()+_()+_()+_()+_()+_()+_()+_()+_()]+_([()])[~_()+~~_()+~~_()]+_([()])[_()+_()+_()]+_(_(())[_()])[_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()]+_(_)[_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()]+_([()])[_()+_()])["+nto_(48)+"]")
		else:
			t.append("_(_([()])[~_()+~~_()+~~_()]+_(_)[_()+_()+_()+_()]+_(_(_)[_()+_()+_()+_()+_()+_()+_()+_()+_()+_()]+_([()])[_()]+_(_)[_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()]+_(_)[_()+_()+_()+_()+_()+_()+_()+_()+_()]+_(_)[_()]+_(_)[_()+_()+_()+_()+_()+_()+_()]+_(_(_)[_()])[_()+_()+_()+_()+_()]+_(_)[_()+_()+_()+_()+_()+_()+_()+_()+_()]+_(_)[_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()]+_(_)[_()+_()+_()+_()+_()+_()+_()+_()+_()]+_(_)[_()+_()+_()+_()+_()+_()]+_(_)[_()+_()+_()]+_(_)[_()+_()+_()+_()+_()+_()+_()+_()+_()]+_([()])[~_()+~~_()+~~_()]+_([()])[_()+_()+_()]+_(_(())[_()])[_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()]+_(_)[_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()]+_([()])[_()+_()])[_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()]+_(_(_)[_()])[_()+_()+_()+_()+_()]+_([()])[_()]+_(_)[_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()]+_([()])[_()+_()]+_(_)[_()+_()+_()+_()+_()+_()+_()+_()+_()]+_(_)[_()]+_(_)[_()+_()+_()+_()+_()+_()+_()]+_(_(_)[_()])[_()+_()+_()+_()+_()]+_(_)[_()+_()+_()+_()+_()+_()+_()+_()+_()]+_(_)[_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()]+_(_)[_()+_()+_()+_()+_()+_()+_()+_()+_()]+_(_)[_()+_()+_()+_()+_()+_()]+_(_)[_()+_()+_()]+_(_)[_()+_()+_()+_()+_()+_()+_()+_()+_()]+_(_(_)[_()])[_()+_()+_()+_()+_()]+_(_)[_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()]+_(_)[_()+_()+_()]+_(_(())[_()])[_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()+_()]+_(_(_)[_()])[_()+_()+_()]+_([()])[_()]+_(_()+_())+_(_()+_()+_()+_()+_())+_(_()+_()+_()+_()+_()+_())+_([()])[_()+_()]+_([()])[_()+_()+_()],_())["+nto_(['\x00', '\x01', '\x02', '\x03', '\x04', '\x05', '\x06', '\x07', '\x08', '\t', '\n', '\x0b', '\x0c', '\r', '\x0e', '\x0f', '\x10', '\x11', '\x12', '\x13', '\x14', '\x15', '\x16', '\x17', '\x18', '\x19', '\x1a', '\x1b', '\x1c', '\x1d', '\x1e', '\x1f', ' ', '!', '"', '#', '$', '%', '&', "'", '(', ')', '*', '+', ',', '-', '.', '/', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', ':', ';', '<', '=', '>', '?', '@', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '[', '\\', ']', '^', '_', '`', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '{', '|', '}', '~', '\x7f', '\x80', '\x81', '\x82', '\x83', '\x84', '\x85', '\x86', '\x87', '\x88', '\x89', '\x8a', '\x8b', '\x8c', '\x8d', '\x8e', '\x8f', '\x90', '\x91', '\x92', '\x93', '\x94', '\x95', '\x96', '\x97', '\x98', '\x99', '\x9a', '\x9b', '\x9c', '\x9d', '\x9e', '\x9f', '\xa0', '\xa1', '\xa2', '\xa3', '\xa4', '\xa5', '\xa6', '\xa7', '\xa8', '\xa9', '\xaa', '\xab', '\xac', '\xad', '\xae', '\xaf', '\xb0', '\xb1', '\xb2', '\xb3', '\xb4', '\xb5', '\xb6', '\xb7', '\xb8', '\xb9', '\xba', '\xbb', '\xbc', '\xbd', '\xbe', '\xbf', '\xc0', '\xc1', '\xc2', '\xc3', '\xc4', '\xc5', '\xc6', '\xc7', '\xc8', '\xc9', '\xca', '\xcb', '\xcc', '\xcd', '\xce', '\xcf', '\xd0', '\xd1', '\xd2', '\xd3', '\xd4', '\xd5', '\xd6', '\xd7', '\xd8', '\xd9', '\xda', '\xdb', '\xdc', '\xdd', '\xde', '\xdf', '\xe0', '\xe1', '\xe2', '\xe3', '\xe4', '\xe5', '\xe6', '\xe7', '\xe8', '\xe9', '\xea', '\xeb', '\xec', '\xed', '\xee', '\xef', '\xf0', '\xf1', '\xf2', '\xf3', '\xf4', '\xf5', '\xf6', '\xf7', '\xf8', '\xf9', '\xfa', '\xfb', '\xfc', '\xfd', '\xfe', '\xff'].index(i))+"]")
	
	return "("+'+'.join(t)+")"

def cgen(s):
	
	r = """def _(s=None,a=0):
	if isinstance(s, str):
		try:
			if a == 0:
				exec(s)
			elif a == 1:
				return eval(s)
		except Exception as e:
			return repr(e)
	elif s == 0:
		return '0'
	elif s == None:
		return True
	elif s == -2:
		return False
	elif s == False:
		return None
	else:
		return str(s)
	
	"""
	
	r += "\n_("+sto_(s)+")\n"
	
	return r

inf = open("code.py","r").read()
out = open("obf.py","w")

out.write(cgen(inf))

raw_input("Press enter to run obfuscated code.")
exec(cgen(inf))