没有名为psycopg2和请求的模块

Question

我正在Mac(塞拉利昂)中运行QGIS，但由于以下错误，我无法加载处理插件：

>>> Couldn't load plugin 'processing' 
ImportError: No module named psycopg2 
Traceback (most recent call last):
  File .     "/usr/local/Cellar/qgis2/2.18.21/QGIS.app/Contents/MacOS/../Resources/python/qgis/utils.py", line 308, in loadPlugin
__import__(packageName)
  File "/usr/local/Cellar/qgis2/2.18.21/QGIS.app/Contents/MacOS/../Resources/python/qgis/utils.py", line 607, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
  File "/usr/local/Cellar/qgis2/2.18.21/QGIS.app/Contents/MacOS/../Resources/python/plugins/processing/__init__.py", line 29, in 
from processing.tools.general import *              # NOQA
  File "/usr/local/Cellar/qgis2/2.18.21/QGIS.app/Contents/MacOS/../Resources/python/qgis/utils.py", line 607, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
  File "/usr/local/Cellar/qgis2/2.18.21/QGIS.app/Contents/MacOS/../Resources/python/plugins/processing/tools/general.py", line 31, in 
from processing.core.Processing import Processing
  File "/usr/local/Cellar/qgis2/2.18.21/QGIS.app/Contents/MacOS/../Resources/python/qgis/utils.py", line 607, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
  File "/usr/local/Cellar/qgis2/2.18.21/QGIS.app/Contents/MacOS/../Resources/python/plugins/processing/core/Processing.py", line 42, in 
from processing.script.ScriptUtils import ScriptUtils
  File "/usr/local/Cellar/qgis2/2.18.21/QGIS.app/Contents/MacOS/../Resources/python/qgis/utils.py", line 607, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
  File "/usr/local/Cellar/qgis2/2.18.21/QGIS.app/Contents/MacOS/../Resources/python/plugins/processing/script/ScriptUtils.py", line 30, in 
from processing.script.ScriptAlgorithm import ScriptAlgorithm
  File "/usr/local/Cellar/qgis2/2.18.21/QGIS.app/Contents/MacOS/../Resources/python/qgis/utils.py", line 607, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
  File "/usr/local/Cellar/qgis2/2.18.21/QGIS.app/Contents/MacOS/../Resources/python/plugins/processing/script/ScriptAlgorithm.py", line 33, in 
from processing.core.GeoAlgorithm import GeoAlgorithm
  File "/usr/local/Cellar/qgis2/2.18.21/QGIS.app/Contents/MacOS/../Resources/python/qgis/utils.py", line 607, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
  File "/usr/local/Cellar/qgis2/2.18.21/QGIS.app/Contents/MacOS/../Resources/python/plugins/processing/core/GeoAlgorithm.py", line 41, in 
from processing.core.parameters import ParameterRaster, ParameterVector, ParameterMultipleInput, ParameterTable, Parameter
  File "/usr/local/Cellar/qgis2/2.18.21/QGIS.app/Contents/MacOS/../Resources/python/qgis/utils.py", line 607, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
  File "/usr/local/Cellar/qgis2/2.18.21/QGIS.app/Contents/MacOS/../Resources/python/plugins/processing/core/parameters.py", line 32, in 
from processing.tools.vector import resolveFieldIndex
  File "/usr/local/Cellar/qgis2/2.18.21/QGIS.app/Contents/MacOS/../Resources/python/qgis/utils.py", line 607, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
  File "/usr/local/Cellar/qgis2/2.18.21/QGIS.app/Contents/MacOS/../Resources/python/plugins/processing/tools/vector.py", line 35, in 
import psycopg2
  File "/usr/local/Cellar/qgis2/2.18.21/QGIS.app/Contents/MacOS/../Resources/python/qgis/utils.py", line 607, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
ImportError: No module named psycopg2
Python version: 2.7.15 (default, Jul  2 2018, 01:42:08) [GCC 4.2.1 
Compatible Apple LLVM 9.1.0 (clang-902.0.39.2)] 
QGIS version: 2.18.21 Las Palmas, exported 

A从这个链接中找到了一个类似的帖子：

链接到上一篇文章

当我在python窗口上键入import requests和import psycopg2时，不会收到任何错误：

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知道为什么会发生这种事吗？我很感激你的帮助。

Answer 1

由于您可以在计算机上安装不同版本的Python，所以要确保pip install psycopg2-binary requests真的应用于QGIS环境并不总是那么简单。

您可能更喜欢从QGIS Python控制台安装软件包，执行以下操作：

from pip._internal import main as pipmain

pipmain(['install', 'psycopg2-binary', 'requests'])

Answer 2

试着安装那些软件包

pip install psycopg2-binary requests