Can't install pendulum unless locale is set to UTF-8

[joar]

To reproduce, run:

env LC_ALL=C pip install --no-cache -I pendulum==2.0.4

DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7.
Collecting pendulum==2.0.4
  Downloading https://files.pythonhosted.org/packages/5b/57/71fc910edcd937b72aa0ef51c8f5734fbd8c011fa1480fce881433847ec8/pendulum-2.0.4.tar.gz (75kB)
    100% |################################| 81kB 2.5MB/s 
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
  Installing backend dependencies ... done
    Preparing wheel metadata ... error
    Complete output from command /home/joar/.virtualenvs/pendulum/bin/python2.7 /home/joar/.virtualenvs/pendulum/local/lib/python2.7/site-packages/pip/_vendor/pep517/_in_process.py prepare_metadata_for_build_wheel /tmp/tmpyu2VCb:
    Traceback (most recent call last):
      File "/home/joar/.virtualenvs/pendulum/local/lib/python2.7/site-packages/pip/_vendor/pep517/_in_process.py", line 207, in <module>
        main()
      File "/home/joar/.virtualenvs/pendulum/local/lib/python2.7/site-packages/pip/_vendor/pep517/_in_process.py", line 197, in main
        json_out['return_val'] = hook(**hook_input['kwargs'])
      File "/home/joar/.virtualenvs/pendulum/local/lib/python2.7/site-packages/pip/_vendor/pep517/_in_process.py", line 69, in prepare_metadata_for_build_wheel
        return hook(metadata_directory, config_settings)
      File "/tmp/pip-build-env-emNFZt/overlay/lib/python2.7/site-packages/poetry/masonry/api.py", line 49, in prepare_metadata_for_build_wheel
        builder._write_metadata_file(f)
      File "/tmp/pip-build-env-emNFZt/overlay/lib/python2.7/site-packages/poetry/masonry/builders/wheel.py", line 314, in _write_metadata_file
        fp.write(decode(self.get_metadata_content()))
    UnicodeEncodeError: 'ascii' codec can't encode character u'\xe9' in position 178: ordinal not in range(128)
    
    ----------------------------------------
Command "/home/joar/.virtualenvs/pendulum/bin/python2.7 /home/joar/.virtualenvs/pendulum/local/lib/python2.7/site-packages/pip/_vendor/pep517/_in_process.py prepare_metadata_for_build_wheel /tmp/tmpyu2VCb" failed with error code 1 in /tmp/pip-install-gZc9To/pendulum

The root cause seems to be in poetry, I've filed a separate issue there: python-poetry/poetry#1030.

A quick fix for pendulum would be to either change the build-system requirement to poetry==0.12.11 or remove the é in pyproject.toml.

[yaoguoba]

I faced the same.

[andrewschultz]

I have Windows 7 and am seeing the same error.

2.0.4 didn't work, but I was able to get things to work easily enough by installing a slightly older version.

pip install pendulum==2.0.2

So that may help narrow down what is going wrong, since Windows users don't seem to be able to set the locale so easily to UTF8. (Would a link to how to do this in the FAQ be appropriate, in case this is a really tricky bug that is prone to happen again?

[Vaelek]

Rather than install an older version of pendulum, I had 2.0.4 installed on another machine and finally narrowed the magic down to the pip version. If you do easy_install pip==18.1 then you will be able to install the latest version of pendulum, and go back to the current pip if you like afterwards.

[vlcinsky]

Shall be fixed by poetry's PR python-poetry/poetry#1085

Both pendulum versions 2.0.2 as well as 2.0.4 include special character é in there:

authors = [
    "Sébastien Eustace <sebastien@eustace.io>"
]

pendulum==2.0.4 includes [build-system] in pyproject.toml:

[build-system]
requires = ["poetry>=0.12"]
build-backend = "poetry.masonry.api"

pendulum==2.0.2 does not include [build-system] in pyproject.toml

Installing pendulum using a wheel works well as the problem is building the wheel properly and not installing the wheel.

Building pendulum==2.0.4 on Linux can fail, if you set other than UTF-8 console encoding.

Problem is in poetry, which created text files without explicit encoding, thus using default system encoding.

[kamichal]

Exactly the same problem with Debian9, python 2.7. Unable to run tox test suite that has pendulum as a dependency of one of mine deps. Tox fails on installdeps step.

Installing pendulum with explicit command works:

pip install pendulum

but

pip install -r requirements.txt

does not.

      File "/tmp/pip-build-env-ydB1WE/overlay/lib/python2.7/site-packages/poetry/masonry/builders/wheel.py", line 314, in _write_metadata_file
        fp.write(decode(self.get_metadata_content()))
    UnicodeEncodeError: 'ascii' codec can't encode character u'\xe9' in position 178: ordinal not in range(128)

[sdispater]

This is now fixed with the release of the new Poetry version