[英]Django 1.8 psycopg2 import error
我在计算机上的C:\\Python34\\Lib\\site-packages\\psycopg2
下安装了C:\\Python34\\Lib\\site-packages\\psycopg2
如果在虚拟环境之外的django项目中使用了postgresql
数据库,则不会出错,但是,当我要将项目传输到一个虚拟环境,以便我可以将其部署在heroku上。 但是,当我尝试迁移数据库时,出现错误,指出不存在psycopg2 module
。 我什至尝试使用pip install psycopg2
将其安装在虚拟环境中,甚至无法正常工作。 这是完整的追溯。
(denv) C:\Users\Saket\denv\musicalguru>python manage.py migrate
Traceback (most recent call last):
File "C:\Users\Saket\denv\lib\site- packages\django\db\backends\postgresql_psycopg2\base.py", line 20, in <module>
import psycopg2 as Database
File "C:\Users\Saket\denv\lib\site-packages\psycopg2\__init__.py", line 50, in<module>from psycopg2._psycopg import BINARY, NUMBER, STRING, DATETIME, ROWID
ImportError: DLL load failed: The specified module could not be found.
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 "C:\Users\Saket\denv\lib\sitepackages
\django\core\management\__init__.py", line 338, in execute_from_command_line
utility.execute()
File "C:\Users\Saket\denv\lib\site- packages\django\core\management\__init__.py", line 312, in execute
django.setup()
File "C:\Users\Saket\denv\lib\site-packages\django\__init__.py", line 18, in setup
apps.populate(settings.INSTALLED_APPS)
File "C:\Users\Saket\denv\lib\site-packages\django\apps\registry.py", line 108, in populate
app_config.import_models(all_models)
File "C:\Users\Saket\denv\lib\site-packages\django\apps\config.py", line 198,in import_models
self.models_module = import_module(models_module_name)
File "C:\Users\Saket\denv\lib\importlib\__init__.py", line 109, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 2254, in _gcd_import
File "<frozen importlib._bootstrap>", line 2237, in _find_and_load
File "<frozen importlib._bootstrap>", line 2226, 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 1471, in exec_module
File "<frozen importlib._bootstrap>", line 321, in _call_with_frames_removed
File "C:\Users\Saket\denv\lib\site- packages\django\contrib\auth\models.py", line 41, in <module>
class Permission(models.Model):
File "C:\Users\Saket\denv\lib\site-packages\django\db\models\base.py", line 139, in __new__
new_class.add_to_class('_meta', Options(meta, **kwargs))
File "C:\Users\Saket\denv\lib\site-packages\django\db\models\base.py", line 324, in add_to_class
value.contribute_to_class(cls, name)
File "C:\Users\Saket\denv\lib\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 "C:\Users\Saket\denv\lib\site-packages\django\db\__init__.py", line 36, in __getattr__
return getattr(connections[DEFAULT_DB_ALIAS], item)
File "C:\Users\Saket\denv\lib\site-packages\django\db\utils.py", line 240, in__getitem__
backend = load_backend(db['ENGINE'])
File "C:\Users\Saket\denv\lib\site-packages\django\db\utils.py", line 111, in
load_backend
return import_module('%s.base' % backend_name)
File "C:\Users\Saket\denv\lib\importlib\__init__.py", line 109, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 2254, in _gcd_import
File "<frozen importlib._bootstrap>", line 2237, in _find_and_load
File "<frozen importlib._bootstrap>", line 2226, 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 1471, in exec_module
File "<frozen importlib._bootstrap>", line 321, in _call_with_frames_removed
File "C:\Users\Saket\denv\lib\sitepackages\django\db\backends\postgresql_psyc
opg2\base.py", line 24, in <module>
raise ImproperlyConfigured("Error loading psycopg2 module: %s" % e)
django.core.exceptions.ImproperlyConfigured: Error loading psycopg2 module: DLL
load failed: The specified module could not be found.
我使用的指令从虚拟ENV安装在这里
然后在系统路径上添加PostgreSQL的'bin'目录。 这似乎可以解决问题。
在Windows下将psycopg2
从源代码安装到virtualenv是一件很痛苦的事情。
相反,您可以创建可以访问系统范围内已安装软件包的virtualenv。
virtualenv --system-site-packages env_dir
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