setup on Python 2.7 is starting to break

traceback と記載された pdfminer==20140328 の回避策を使って、Python 2.7 のインストール失敗を再現します。pdfminer がどのように選択されるかを確認するため、プロジェクトの依存関係と setup の設定を調査します。手動で依存関係をインストールしなくても Python 2.7 でインストールが失敗しなくなり、サポート対象の動作が検証されれば完了です。

Latest versions of pdfminer are no longer compatible with Python 2.7, which results in the install of pattern failing as well because pdfminer expects Python 3.6 or higher, but does not check for this.

Traceback (most recent call last):

  File "<string>", line 1, in <module>
  File "/tmp/pip-install-6LDKdm/pdfminer/setup.py", line 71, in <module>
    'Topic :: Text Processing',
  File "pattern-test/.env/local/lib/python2.7/site-packages/setuptools/__init__.py", line 145, in setup
    return distutils.core.setup(**attrs)
  File "/usr/lib/python2.7/distutils/core.py", line 151, in setup
    dist.run_commands()
  File "/usr/lib/python2.7/distutils/dist.py", line 953, in run_commands
    self.run_command(cmd)
  File "/usr/lib/python2.7/distutils/dist.py", line 972, in run_command
    cmd_obj.run()
  File "/tmp/pip-install-6LDKdm/pdfminer/setup.py", line 11, in run
    from pdfminer.cmapdb import convert_cmap
  File "/tmp/pip-install-6LDKdm/pdfminer/pdfminer/cmapdb.py", line 22, in <module>
    from .psparser import PSStackParser
  File "/tmp/pip-install-6LDKdm/pdfminer/pdfminer/psparser.py", line 4, in <module>
    from .utils import choplist
  File "/tmp/pip-install-6LDKdm/pdfminer/pdfminer/utils.py", line 219, in <module>
    0x00f8, 0x00f9, 0x00fa, 0x00fb, 0x00fc, 0x00fd, 0x00fe, 0x00ff,
  File "/tmp/pip-install-6LDKdm/pdfminer/pdfminer/utils.py", line 187, in <genexpr>
    PDFDocEncoding = ''.join(chr(x) for x in (
ValueError: chr() arg not in range(256)

Can be solved by installing pdfminer==20140328 first.