在 macOS 上通过 Python 2.7 创建与 PostgreSQL 的连接时安装“psycopg2”python 模块时出错

Question

也尝试安装 psycopg2-binary 但同样的错误（不知道我在这里错过了什么，PostgreSQL 和 PyCharm 的新手）

pip install psycopg2
pip install psycopg2-binary

错误信息

Traceback (most recent call last):
  File "/usr/local/bin/pip", line 9, in <module>
    load_entry_point('pip==7.1.0', 'console_scripts', 'pip')()
  File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 558, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2682, in load_entry_point
    return ep.load()
  File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2355, in load
    return self.resolve()
  File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2365, in resolve
    raise ImportError(str(exc))
ImportError: 'module' object has no attribute 'main'

Answer 1

1. 首先运行easy_install --upgrade pip命令来升级你的 pip。

2. 然后输入并运行这个

from pip._internal import main
main(['install', 'psycopg2'])

3. 之后运行这个

main(['install', 'psycopg2-binary'])