Python Syntax Error on Bit Literal

Question

I have inherited this python program and, being sort of a noob with bits and such I can't figure out what the problem is. I am getting a syntax error on the first line of the following function:

def tileKey(self, z, x, y):
    zBits = z & 0xFFL
    #  8bits, 256 levels. normally [0,21]
    xBits = x & 0xFFFFFFFL
    #  28 bits
    yBits = y & 0xFFFFFFFL
    #  28 bits
    key = (zBits << 56) | (xBits << 28) | (yBits << 0)
    #  return the key value integer 720576213915009588
    return key

Please edit your post to include the full traceback/error-message. Thank you. — mechanical_meat, Feb 22 '13 at 18:41
sorry, the cutting pasting error, whitespace is corrected. Also this is inside a class, hence the self arg. — Frank Conry, Feb 22 '13 at 18:42
what actually is 0xFFL for a number? There is no `L` in hex?! — El Hocko, Feb 22 '13 at 18:45
@cIph3r `L` stands for `Long` (unrelated but interesting → [link](http://stackoverflow.com/a/2104947/1376657)). — Nadir Sampaoli, Feb 22 '13 at 18:45
ahh ok, I use python3.2, the `L` does not exist here anymore — El Hocko, Feb 22 '13 at 18:49
@cIph3r I've already taken a guess that is the error :) Short of confirmation though - we're still waiting to see what the real error message is — Jon Clements, Feb 22 '13 at 18:49
I checked Jon Clements Answer, thanks to everybody. I was running it in the GUI that came with Python on windows, IDLE. So it was literally just a message box that said "syntax error." Thanks again. — Frank Conry, Feb 22 '13 at 19:16

score 12 · Accepted Answer · answered Feb 22 '13 at 18:47

12

If you're using Python 3.x, then you can't use the 'L' suffix anymore as it's no longer required and not part of the syntax:

yBits = y & 0xFFFFFFFL
Original exception was:
  File "<stdin>", line 1
    0xFFL
        ^
SyntaxError: invalid syntax

answered Feb 22 '13 at 18:47

Jon Clements

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so... just remove the '`L`'? – cryanbhu Sep 07 '19 at 16:42
1

@cryanbhu yup - that's the one... – Jon Clements Sep 07 '19 at 17:56

piokuc · Answer 2 · 2013-02-22T18:44:43.763

It's because of the wrong indentation, you have to indent body of the function. Your function should be indented like this:

def tileKey(self, z, x, y):
    zBits = z & 0xFFL
    #  8bits, 256 levels. normally [0,21]
    xBits = x & 0xFFFFFFFL
    #  28 bits
    yBits = y & 0xFFFFFFFL
    #  28 bits
    key = (zBits << 56) | (xBits << 28) | (yBits << 0)
    #  return the key value integer 720576213915009588
    return key

It looks like it is a method in a class, so the whole definition of the method should be indented after the line with class keyword, for example:

class YourClass:
    def tileKey(self, z, x, y):
        zBits = z & 0xFFL
        #  8bits, 256 levels. normally [0,21]
        xBits = x & 0xFFFFFFFL
        #  28 bits
        yBits = y & 0xFFFFFFFL
        #  28 bits
        key = (zBits << 56) | (xBits << 28) | (yBits << 0)
        #  return the key value integer 720576213915009588
        return key

sorry my bad, the indentation was corrrect, the cutting and pasting wasn't, should be fixed now. — Frank Conry, Feb 22 '13 at 18:40

Python Syntax Error on Bit Literal

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