SyntaxError: unexpected character after line continuation character

[hbknjr]

That's some fun script.

To understand the problem you should print variable c.You'll see that i = 0\nwhile True:\n\tprint(i)\n\ti += 1 is printed which implies that the backslash has already been escaped. So your real string actually is i = 0\\nwhile True:\\n\\tprint(i)\\n\\ti += 1.

To solve the problem convert string to bytes and decode with unicode-escape

c = (decode(code))
c = c.encode('ascii').decode('unicode-escape')
exec(c)

More on problem:

>>> a = 'hello \nThis is newline \n\tThis is horizontal tab'
>>> print(a)
hello
This is newline
        This is horizontal tab
>>> a = 'hello \\nThis is not a newline \\n\\tThis is not a horizontal tab'
>>> print(a)
hello \nThis is not a newline \n\tThis is not a horizontal tab