ModuleNotFoundError:没有名为“psycopg2”的模块(python3、mac、pip3显示psycopg2已成功安装)

解决方案:了解虚拟环境。

pip install virtualenv

问题:我在python3中得到psycopg2的ModuleNotFoundError,尽管它已通过pip3成功安装。(我在终端上发布了简短的代码进行总结,但这些错误当然会让我在试图运行的.py脚本上感到不安。)

Python3包装:

macs-MacBook-Air-2% pip3 list
Package    Version
---------- -------
pip        19.2.3
psycopg2   2.8.4
setuptools 41.4.0
wheel      0.33.6

Python3 psycopg2错误:

macs-MacBook-Air-2% python3
Python 3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 16:52:21)
[Clang 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.

>>> import psycopg2
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'psycopg2'

我只做了:

pip3 install psycopg2

附加说明:

顺便说一下,当我运行2.7时,一切都很好。(我使用pip安装psycopg2。)

macs-MacBook-Air-2% python
Python 2.7.10 (default, Oct  6 2017, 22:29:07)
[GCC 4.2.1 Compatible Apple LLVM 9.0.0 (clang-900.0.31)] on darwin
Type "help", "copyright", "credits" or "license" for more information.

>>> import psycopg2
>>> psycopg2.__version__
'2.8.4 (dt dec pq3 ext lo64)'
>>>

Python2.7包:

macs-MacBook-Air-2% pip list
DEPRECATION: ...2.7 end of life notice..
Package                                Version
-------------------------------------- -----------
altgraph                               0.10.2
astroid                                1.6.6
...more
psycopg2                               2.8.4
...more
zope.interface                         4.6.0

我对编码很陌生,我搜索了这个错误。但是,我没有找到对我有意义的结果,包括python3错误+成功的python3安装。