python - 提高配置不当的psycopg2(postgresql)

Question

我是 django 的新手。我曾尝试用我的项目配置 postgresql。 我遵循的步骤:

1) sudo apt-get install psycopg2

2) 改变settings.py

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': 'dbname',
        'USER': 'postgres',
        'PASSWORD': 'postgres',
        'HOST': '',
        'PORT': '',
    }
}

3) 运行 python manage.py makemigrations

但是我得到了错误

Traceback (most recent call last):
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/backends/postgresql_psycopg2/base.py", line 20, in <module>
    import psycopg2 as Database
ImportError: No module named 'psycopg2'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/core/management/__init__.py", line 338, in execute_from_command_line
    utility.execute()
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/core/management/__init__.py", line 312, in execute
    django.setup()
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/__init__.py", line 18, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/apps/registry.py", line 108, in populate
    app_config.import_models(all_models)
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/apps/config.py", line 198, in import_models
    self.models_module = import_module(models_module_name)
  File "/home/vivekpradhan/joker/basket/lib/python3.4/importlib/__init__.py", line 109, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 2231, in _gcd_import
  File "<frozen importlib._bootstrap>", line 2214, in _find_and_load
  File "<frozen importlib._bootstrap>", line 2203, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 1200, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 1129, in _exec
  File "<frozen importlib._bootstrap>", line 1448, in exec_module
  File "<frozen importlib._bootstrap>", line 321, in _call_with_frames_removed
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/contrib/auth/models.py", line 41, in <module>
    class Permission(models.Model):
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/models/base.py", line 139, in __new__
    new_class.add_to_class('_meta', Options(meta, **kwargs))
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/models/base.py", line 324, in add_to_class
    value.contribute_to_class(cls, name)
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/models/options.py", line 250, in contribute_to_class
    self.db_table = truncate_name(self.db_table, connection.ops.max_name_length())
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/__init__.py", line 36, in __getattr__
    return getattr(connections[DEFAULT_DB_ALIAS], item)
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/utils.py", line 240, in __getitem__
    backend = load_backend(db['ENGINE'])
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/utils.py", line 111, in load_backend
    return import_module('%s.base' % backend_name)
  File "/home/vivekpradhan/joker/basket/lib/python3.4/importlib/__init__.py", line 109, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 2231, in _gcd_import
  File "<frozen importlib._bootstrap>", line 2214, in _find_and_load
  File "<frozen importlib._bootstrap>", line 2203, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 1200, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 1129, in _exec
  File "<frozen importlib._bootstrap>", line 1448, in exec_module
  File "<frozen importlib._bootstrap>", line 321, in _call_with_frames_removed
  File "/home/vivekpradhan/joker/basket/local/lib/python3.4/site-packages/django/db/backends/postgresql_psycopg2/base.py", line 24, in <module>
    raise ImproperlyConfigured("Error loading psycopg2 module: %s" % e)
django.core.exceptions.ImproperlyConfigured: Error loading psycopg2 module: No module named 'psycopg2'

Answer 1

当我遇到这个问题时，尽管已经安装了软件包，但它帮助我重新安装了它。不知道为什么。

(venv) $ pip uninstall psycopg2
(venv) $ pip install psycopg2