Dependency that is only compatible/needed with/in python 2 in setup.py

[prometheanfire]

this causes pip install to fail (at least with my py3.4 system)

[colonelpanic8]

This is working for me on my OSX yosemite machines, and it has not caused in the travis linux (debian, i think) builds. Can you give me some more details about your system?

[colonelpanic8]

also, can you clarify what the of this issue means?

[prometheanfire]

 pip install --user --install-option="--install-scripts=/home/mthode/bin" vcrpy
Downloading/unpacking vcrpy
  Downloading vcrpy-1.4.0.tar.gz
  Running setup.py (path:/tmp/pip_build_mthode/vcrpy/setup.py) egg_info for package vcrpy

Requirement already satisfied (use --upgrade to upgrade): PyYAML in /usr/lib64/python3.4/site-packages (from vcrpy)
Requirement already satisfied (use --upgrade to upgrade): mock in /usr/lib64/python3.4/site-packages (from vcrpy)
Requirement already satisfied (use --upgrade to upgrade): six in /usr/lib64/python3.4/site-packages (from vcrpy)
Requirement already satisfied (use --upgrade to upgrade): contextlib2 in /usr/lib64/python3.4/site-    packages (from vcrpy)
Downloading/unpacking wrapt (from vcrpy)
  Downloading wrapt-1.10.4.tar.gz
  Running setup.py (path:/tmp/pip_build_mthode/wrapt/setup.py) egg_info for package wrapt

Downloading/unpacking backport-collections (from vcrpy)
  Downloading backport_collections-0.1.tar.gz
  Running setup.py (path:/tmp/pip_build_mthode/backport-collections/setup.py) egg_info for     package backport-collections

Installing collected packages: vcrpy, wrapt, backport-collections
  Running setup.py install for vcrpy

  Running setup.py install for wrapt
    building 'wrapt._wrappers' extension
    x86_64-pc-linux-gnu-gcc -pthread -fPIC -I/usr/include/python3.4 -c src/_wrappers.c -o build/temp.linux-x86_64-3.4/src/_wrappers.o
    x86_64-pc-linux-gnu-gcc -pthread -shared build/temp.linux-x86_64-3.4/src/_wrappers.o -L/usr/lib64 -lpython3.4 -o build/lib.linux-x86_64-3.4/wrapt/_wrappers.cpython-34.so

  Running setup.py install for backport-collections
      File "/home/mthode/.local/lib64/python3.4/site-packages/backport_collections.py", line 368
        print class_definition
                             ^
    SyntaxError: invalid syntax


Successfully installed vcrpy wrapt backport-collections
Cleaning up...

[kevin1024]

ah, probably just needs something like this:

# setup.py

install_requires = ['somelib1', 'somelib2']

try:
    import collections
except ImportError:
    install_requires.append('backport-collections')

setup(
    ...
    install_requires=install_requires,
    ...
)

[prometheanfire]

Ya, something like that could work. Either that or checking the python version and using that to append.

[colonelpanic8]

yeah but then the question is: why isn't this failing in travis?

[prometheanfire]

The install technically succeeds, I'm guessing other protections protect the tests from importing this lib.

[kevin1024]

Maybe travis's pip has a #!/bin/python2 at the start.

[graingert]

you should use:

extras_require = {
    ':python_version<=2.4': ['contextlib2',],
    ':python_version<=2.6': ['backport_collections',],
    ':python_version<=3.2': ['mock'],
}

in the setup.py

[colonelpanic8]

ah nice didnt know that you could do that.

Why ':python_versioin<=3.3': ['mock'] ?

I just used mock in python 3.4

 imalison  ~  Projects  dispatch  python3.4                                                                                                                                                                                                                                                                                                                       mf
Python 3.4.3 (default, Apr  7 2015, 08:05:21)
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import mock
>>> mock.Mock().test
<Mock name='mock.test' id='4436658048'>

And things worked fine.

[graingert]

You're supposed to use unittest.mock on python 3.3+