[Python] Incorrect example for Cython usage

[asfimport]

When blindly pasting the Cython distutils example, one might get the following error:

Traceback (most recent call last):
  File "setup.py", line 20, in <module>
    ext_modules=ext_modules,
  File "/home/antoine/miniconda3/envs/pyarrow/lib/python3.6/distutils/core.py", line 148, in setup
    dist.run_commands()
  File "/home/antoine/miniconda3/envs/pyarrow/lib/python3.6/distutils/dist.py", line 955, in run_commands
    self.run_command(cmd)
  File "/home/antoine/miniconda3/envs/pyarrow/lib/python3.6/distutils/dist.py", line 974, in run_command
    cmd_obj.run()
  File "/home/antoine/miniconda3/envs/pyarrow/lib/python3.6/distutils/command/build_ext.py", line 339, in run
    self.build_extensions()
  File "/home/antoine/miniconda3/envs/pyarrow/lib/python3.6/distutils/command/build_ext.py", line 448, in build_extensions
    self._build_extensions_serial()
  File "/home/antoine/miniconda3/envs/pyarrow/lib/python3.6/distutils/command/build_ext.py", line 473, in _build_extensions_serial
    self.build_extension(ext)
  File "/home/antoine/miniconda3/envs/pyarrow/lib/python3.6/distutils/command/build_ext.py", line 558, in build_extension
    target_lang=language)
  File "/home/antoine/miniconda3/envs/pyarrow/lib/python3.6/distutils/ccompiler.py", line 717, in link_shared_object
    extra_preargs, extra_postargs, build_temp, target_lang)
  File "/home/antoine/miniconda3/envs/pyarrow/lib/python3.6/distutils/unixccompiler.py", line 159, in link
    libraries)
  File "/home/antoine/miniconda3/envs/pyarrow/lib/python3.6/distutils/ccompiler.py", line 1089, in gen_lib_options
    lib_opts.append(compiler.library_dir_option(dir))
  File "/home/antoine/miniconda3/envs/pyarrow/lib/python3.6/distutils/unixccompiler.py", line 207, in library_dir_option
    return "-L" + dir
TypeError: must be str, not list

Reporter: Antoine Pitrou / @pitrou
Assignee: Antoine Pitrou / @pitrou

Related issues:

• [Python] Memory Issue passing table from python to c++ via cython (is superceded by)

_{Note: This issue was originally created as ARROW-2867. Please see the migration documentation for further details.}