pandas-0.19.0rc1: 'global name tempita is not defined'

[jgerardsimcock]

I am running a Travis CI build in a python 2.7 min environment. Not sure why it is pulling from an unreleased version of pandas but it looks like the tempita needs to be imported.

[jreback]

you must have a really really old version of cython (or maybe cython is not installed). you are building from source so you need to have the development requirements. http://pandas.pydata.org/pandas-docs/stable/install.html#installing-from-source

This is not recommended unless you are developing pandas. there are wheels and conda packages available.

[jreback]

acutally this should be a better reported error (meaning setup should fail)

when cython is NOT installed (as is required), we cannot run tempita.
So need to put a check in.

[Sun Sep 11 19:47:16 ~/pandas]$ rm pandas/src/algos_groupby_helper.pxi
[Sun Sep 11 19:47:36 ~/pandas]$ make
python setup.py build_ext --inplace
running build_ext
Traceback (most recent call last):
  File "setup.py", line 94, in <module>
    if cython:
  File "/Users/jreback/miniconda/lib/python2.7/distutils/core.py", line 151, in setup
    dist.run_commands()
  File "/Users/jreback/miniconda/lib/python2.7/distutils/dist.py", line 953, in run_commands
    self.run_command(cmd)
  File "/Users/jreback/miniconda/lib/python2.7/distutils/dist.py", line 972, in run_command
    cmd_obj.run()
  File "/Users/jreback/miniconda/lib/python2.7/distutils/command/build_ext.py", line 339, in run
    self.build_extensions()
  File "setup.py", line 368, in build_extensions
    build_ext.build_extensions(self)
  File "setup.py", line 140, in build_extensions
    pyxcontent = tempita.sub(tmpl)
NameError: global name 'tempita' is not defined
make: *** [tseries] Error 1

[fungi]

It's unclear to me why this was implemented with the equivalent of an assertion in setup.py rather than adding cython to the setup_requires list. Pandas 0.19.0 upgrades via pip on Linux (due to lack of Linux wheels support on PyPI) collapse catastrophically, requiring someone to manually pip install cython into the env first.

[jreback]

@fungi not sure what you are taking about

this issue is fixed on 0.19.0
and wheels are supoorted on linux

[fungi]

Wheels are supported on Linux, but Linux wheels (the manylinux1 platform PEP aside) are not supported on PyPI. Thus, pip install pandas on Linux throws "ImportError: Building pandas requires cython" instead of installing cython automatically. I'm in the process of opening a separate issue now for this and will gladly submit a PR updating setup.py to use setup_requires for cython unless there's a good reason it shouldn't.

[jorisvandenbossche]

@fungi Have a look at PyPI, the linux wheels are definitely there: https://pypi.python.org/pypi/pandas. Maybe you need to update pip to download them?