Hello.

I could use some help with some cython issues building pandas for EL8. First attempt:

https://koji.fedoraproject.org/koji/taskinfo?taskID=37887295

running build_ext
pandas._libs.algos: -> [['pandas/_libs/algos.c']]
Traceback (most recent call last):
  File "setup.py", line 838, in <module>
    **setuptools_kwargs
  File "/usr/lib/python3.6/site-packages/setuptools/__init__.py", line 129, in setup
    return distutils.core.setup(**attrs)
  File "/usr/lib64/python3.6/distutils/core.py", line 148, in setup
    dist.run_commands()
  File "/usr/lib64/python3.6/distutils/dist.py", line 955, in run_commands
    self.run_command(cmd)
  File "/usr/lib64/python3.6/distutils/dist.py", line 974, in run_command
    cmd_obj.run()
  File "/usr/lib64/python3.6/distutils/command/build.py", line 135, in run
    self.run_command(cmd_name)
  File "/usr/lib64/python3.6/distutils/cmd.py", line 313, in run_command
    self.distribution.run_command(command)
  File "/usr/lib64/python3.6/distutils/dist.py", line 974, in run_command
    cmd_obj.run()
  File "/usr/lib64/python3.6/distutils/command/build_ext.py", line 339, in run
    self.build_extensions()
  File "setup.py", line 407, in build_extensions
    self.check_cython_extensions(self.extensions)
  File "setup.py", line 402, in check_cython_extensions
    src=src
Exception: Cython-generated file 'pandas/_libs/algos.c' not found.
                Cython is required to compile pandas from a development branch.
                Please install Cython or download a release package of pandas.

Compared to a rawhide build, it seems like the cython c files are not being automatically regenerated at the start of the build.  What component is supposed to handle this?

Second attempt to run cython by hand generates another error:

https://koji.fedoraproject.org/koji/taskinfo?taskID=37887587

+ cython ./pandas/_libs/missing.pyx ./pandas/_libs/testing.pyx ./pandas/_libs/interval.pyx ./pandas/_libs/window.pyx ./pandas/_libs/internals.pyx ./pandas/_libs/join.pyx ./pandas/_libs/index.pyx ./pandas/_libs/writers.pyx ./pandas/_libs/groupby.pyx ./pandas/_libs/reduction.pyx ./pandas/_libs/hashtable.pyx ./pandas/_libs/parsers.pyx ./pandas/_libs/tslibs/conversion.pyx ./pandas/_libs/tslibs/np_datetime.pyx ./pandas/_libs/tslibs/period.pyx ./pandas/_libs/tslibs/timedeltas.pyx ./pandas/_libs/tslibs/ccalendar.pyx ./pandas/_libs/tslibs/strptime.pyx ./pandas/_libs/tslibs/resolution.pyx ./pandas/_libs/tslibs/fields.pyx ./pandas/_libs/tslibs/c_timestamp.pyx ./pandas/_libs/tslibs/offsets.pyx ./pandas/_libs/tslibs/timestamps.pyx ./pandas/_libs/tslibs/parsing.pyx ./pandas/_libs/tslibs/tzconversion.pyx ./pandas/_libs/tslibs/timezones.pyx ./pandas/_libs/tslibs/frequencies.pyx ./pandas/_libs/tslibs/nattype.pyx ./pandas/_libs/hashing.pyx ./pandas/_libs/tslib.pyx ./pandas/_libs/indexing.pyx ./pandas/_libs/sparse.pyx ./pandas/_libs/algos.pyx ./pandas/_libs/skiplist.pyx ./pandas/_libs/ops.pyx ./pandas/_libs/reshape.pyx ./pandas/_libs/lib.pyx ./pandas/_libs/properties.pyx ./pandas/io/sas/sas.pyx ./pandas/io/msgpack/_packer.pyx ./pandas/io/msgpack/_unpacker.pyx
Error compiling Cython file:
------------------------------------------------------------
...
        cdef int status
        with nogil:
            status = tokenize_nrows(self.parser, nrows)
        if self.parser.warn_msg != NULL:
            print(self.parser.warn_msg, file=sys.stderr)
                                           ^
------------------------------------------------------------
pandas/_libs/parsers.pyx:932:44: Expected ')', found '='

It this because cython is too old in EL8?

This might be caused by the fact that Cython treats prints as Python 2 statement instead of Python 3 function by default. This can be solved by either import print_function from __future__ or add a comment "#cython: language_level=3" or without touching the source files using cython -3 command.

Lumír

TIA,

  Orion

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