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我有一个 Django 项目，我想将其与 PostgreSQL 数据库一起使用，但我遇到了 psycopg2 的问题。当我尝试运行开发服务器或执行同步数据库时，出现此错误。我的项目位于运行 Python 3.4 和 Django 1.6 的 virtualenv 中。

Traceback (most recent call last):
  File "/home/gabriel/DevSpace/Django_Projects/Kevmo/lib/python3.4/site-packages/django/db/backends/postgresql_psycopg2/base.py", line 22, in <module>
    import psycopg2.extensions
ImportError: No module named 'psycopg2.extensions'

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/gabriel/DevSpace/Django_Projects/Kevmo/lib/python3.4/site-packages/django/core/management/__init__.py", line 399, in execute_from_command_line
    utility.execute()
  File "/home/gabriel/DevSpace/Django_Projects/Kevmo/lib/python3.4/site-packages/django/core/management/__init__.py", line 392, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/gabriel/DevSpace/Django_Projects/Kevmo/lib/python3.4/site-packages/django/core/management/base.py", line 242, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/home/gabriel/DevSpace/Django_Projects/Kevmo/lib/python3.4/site-packages/django/core/management/base.py", line 280, …