python - 为什么 "pip install"在 setup.py 中引发语法错误？

Question

我尝试通过 pip 安装 python 包，这会在 setup.py 中引发语法错误:

$ /usr/bin/pip install dash --user
DEPRECATION: Python 2.6 is no longer supported by the Python core team, please upgrade your Python. A future version of pip will drop support for Python 2.6
Collecting dash
  Using cached https://files.pythonhosted.org/packages/ad/94/c591c1ff695c32e7fc5138525f3a792d289160008f1a7f517860cc744a85/dash-0.26.5.tar.gz
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-ysGuJO/dash/setup.py", line 5, in <module>
        exec(open('dash/version.py').read(), main_ns)  # pylint: disable=exec-used
      File "<string>", line 1
        __version__ = '0.26.5'
                              ^
    SyntaxError: invalid syntax

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-ysGuJO/dash/
You are using pip version 7.1.0, however version 18.0 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

我在这里做错了什么？我想这与太旧的 python 版本有关:

$ python --version
Python 2.6.6

因为响应类似于 this, more specific question on stackoverflow和

pip install urllib3 

工作正常，只需要 >= Python 2.6。

Answer 1

这是一个问题，因为 python 版本较旧。你可能需要升级你的Python。升级后，您将不会遇到任何问题。以下是升级步骤。在您的终端中写下步骤。

    # refreshing the repositories
    sudo apt update
    # its wise to keep the system up to date!
    # you can skip the following line if you not
    # want to update all your software
    sudo apt upgrade
    # installing python 2.7 and pip for it
    sudo apt install python2.7 python-pip
    # installing python-pip for 3.6
    sudo apt install python3-pip