Python Script not executing in Light Table shows error

lighttable, python

Solution

I have no idea about the Light Table part, but the error you show is the one that you'd get if you were to somehow try to execute a Python 3 `print` function call under Python 2 (where `print` is a statement with a quirky syntax rather than a function). Lines 175-176 of `site.py` in the Python 3.4 distribution look like this (modulo leading indentation):

print("Error processing line {:d} of {}:\n".format(n+1, fullname),
      file=sys.stderr)

and sure enough, if you try to execute that in a Python 2 interpreter you'll get a `SyntaxError`, with the cursor pointing to that same `=` sign:

Python 2.7.8 (default, Jul  3 2014, 06:13:58) 
[GCC 4.2.1 Compatible Apple LLVM 5.1 (clang-503.0.40)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> print("Error processing line {:d} of {}:\n".format(n+1, fullname), file=sys.stderr)
  File "<stdin>", line 1
    print("Error processing line {:d} of {}:\n".format(n+1, fullname), file=sys.stderr)
                                                                           ^
SyntaxError: invalid syntax

I'd suggest looking closely at the settings for the Light Table Python plugin to see if anything's awry. You should also check the setting for your `PYTHONPATH` environment variable. If it includes a reference to the `C:\Python34` directory and you're running Python 2, that could be the cause of the problem. Here's an example of the exact same problem on OS X, caused by starting Python 2 with a `PYTHONPATH` that refers to Python 3's library directory:

noether:~ mdickinson$ export PYTHONPATH=/opt/local/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/
noether:~ mdickinson$ python2.7
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site.py", line 176
    file=sys.stderr)
        ^
SyntaxError: invalid syntax

Problem

Original source

Related problems

• Using multiple versions of Python