将 Pony ORM 连接到 PostgreSQL 的问题答案

【问题标题】：Problem with connection Pony ORM to PostgreSQL将 Pony ORM 连接到 PostgreSQL 的问题
【发布时间】：2020-03-18 20:00:36
【问题描述】：

尝试使用 Pony ORM 连接到 PostgreSQL 数据库。从已安装软件包 pony 和 psycopg2 的 venv 运行脚本。 screenshot 但还是有例外：

D:\***\venv\Scripts\python.exe D:/***/models.py
Traceback (most recent call last):
  File "D:\***\venv\lib\site-packages\pony\orm\dbproviders\postgres.py", line 9, in <module>
    import psycopg2
  File "D:\***\venv\lib\site-packages\psycopg2\__init__.py", line 50, in <module>
    from psycopg2._psycopg import (                     # noqa
ImportError: DLL load failed while importing _psycopg: Не найден указанный модуль.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "D:\***\venv\lib\site-packages\pony\orm\dbproviders\postgres.py", line 12, in <module>
    from psycopg2cffi import compat
ModuleNotFoundError: No module named 'psycopg2cffi'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "D:/***/models.py", line 6, in <module>
    db.bind(**DB_CONFIG)
  File "D:\***\venv\lib\site-packages\pony\orm\core.py", line 769, in bind
    self._bind(*args, **kwargs)
  File "D:\***\venv\lib\site-packages\pony\orm\core.py", line 788, in _bind
    provider_module = import_module('pony.orm.dbproviders.' + provider)
  File "D:\***\venv\lib\site-packages\pony\utils\utils.py", line 219, in import_module
    mod = __import__(name)
  File "D:\***\venv\lib\site-packages\pony\orm\dbproviders\postgres.py", line 14, in <module>
    raise ImportError('In order to use PonyORM with PostgreSQL please install psycopg2 or psycopg2cffi')
ImportError: In order to use PonyORM with PostgreSQL please install psycopg2 or psycopg2cffi

【问题讨论】：

标签： python-3.x postgresql ponyorm

【解决方案1】：

尝试再次安装 psycopg2，但这次尝试利用预编译的二进制文件：

pip install psycopg2-binary

https://www.psycopg.org/docs/install.html#binary-install-from-pypi

【讨论】：

@sdmnt，您是否在新的虚拟环境中尝试过？如果是，错误信息是相同还是不同？