Python 2.7 compatibility

[rxseger]

Adds an import for (the beginning of) Python 2.7 compatibility. Without this change, Python 2 fails with:

TLCS-900 $ python -V
Python 2.7.12
TLCS-900 $ python dis.py 
  File "dis.py", line 77
    clear = lambda: print("\n" * 120)
                        ^
SyntaxError: invalid syntax

with this change, python dis.py runs successfully and shows the help usage, although attempting to disassemble with Python 2 fails with a different error:

TLCS-900 $ python dis.py -i /tmp/in -o /tmp/x
Traceback (most recent call last):
  File "dis.py", line 281, in <module>
    ib = InputBuffer(f, file_len, bounds)
  File "dis.py", line 116, in __init__
    self.access = bytearray(math.ceil(available / 8))
TypeError: 'float' object is not iterable

Haven't investigated this second error yet, I went ahead and installed Python 3.5.2 instead and was able to disassemble successfully, but this print_function import is a start towards Python 2 compatibility, hopefully it may be useful.

[Victorious3]

I'll pull if you manage to fix the other incompatibilities, although, I'm curious, what are you planning to use this for? It never quite got all the functionality I wanted it to have and then I eventually abandoned it because I got stuck on something else. If this has a legitimate use I might want to come back to it.

[rxseger]

Added a fix for the float not iterable error (bytearray(float) fails in both Python 3 and 2 but 2 was passing an int), but there's still more errors not ready to pull yet, next is:

Traceback (most recent call last):
  File "dis.py", line 284, in <module>
    insn = Insn(executor, ib, ob, ENTRY_POINT)
  File "dis.py", line 203, in __init__
    threading.Thread.__init__(self, daemon = True)
TypeError: __init__() got an unexpected keyword argument 'daemon'

---

although, I'm curious, what are you planning to use this for?

I pulled a chip from an old DVD player which has a Toshiba TMP91C219F (16-bit TLCS-900/L1 series) micro, just was curious to see what the firmware looked like. Ran into difficulties dumping the complete ROM because of the cumbersome parallel interface, but I did manage to read the first few bytes, if you're curious it disassembles to:

Instructions: 
    Section at 0: 
        0 : 06 07          | EI 7
        2 : 47 00 12 C2 00 | LD XSP, 12718592
        7 : 42 80 00 80 00 | LD XDE, 8388736
        12: 41 24 48 FF 80 | LD XBC, 2164213796
        17: 07             | RETI 
Done in 0.0 seconds.

(which I think seems to be reasonably correct, modulo my dumping errors). Thanks for making this disassembler, couldn't find any free alternatives (IDA Pro has Toshiba TLCS 900 support but it is quite expensive)