Psycopg2 错误：找不到符号_PQbackendPID

Question

我从 psycopg2 收到以下错误：

Traceback (most recent call last):   File "test1.py", line 1, in
<module>
    import psycopg2   File "/Users/xxx/Library/Python/2.7/lib/python/site-packages/psycopg2/__init__.py",
line 50, in <module>
    from psycopg2._psycopg import (                     # noqa ImportError:
dlopen(/Users/xxx/Library/Python/2.7/lib/python/site-packages/psycopg2/_psycopg.so,
2): Symbol not found: _PQbackendPID   Referenced from:
/Users/xxx/Library/Python/2.7/lib/python/site-packages/psycopg2/_psycopg.so
Expected in: flat namespace  in
/Users/eyabadal/Library/Python/2.7/lib/python/site-packages/psycopg2/_psycopg.so

对于如何解决这个问题，有任何的建议吗？

Answer 1

我在 macOS 上遇到了同样的问题，并通过运行以下步骤解决了它：

1. 卸载 psycopg2：pip uninstall psycopg2

2. 重新安装 psycopg2：pip install psycopg2-binary

Answer 2

我遇到了同样的问题，psycopg2-binary使用选项安装--no-cache-dir对我有帮助。

pip install psycopg2-binary --no-cache-dir