不能使用Django中的virtualenv

Question

我有两个Django的项目，我创建了两个不同的virtualenv他们。 当我创造一个又一个的virtualenv并安装Django和创建一个Django项目我试图python manage.py的runserver并有此错误：

Traceback (most recent call last): 
    File "manage.py", line 8, in <module> 
    from django.core.management import execute_from_command_line 
ImportError: No module named 'django' 

During handling of the above exception, another exception occurred: 

Traceback (most recent call last): 
    File "manage.py", line 14, in <module> 
    import django 
ImportError: No module named 'django' 

During handling of the above exception, another exception occurred: 

Traceback (most recent call last): 
    File "manage.py", line 17, in <module> 
    "Couldn't import Django. Are you sure it's installed and " 
ImportError: Couldn't import Django. Are you sure it's installed and available on your PYTHONPATH environment variable? Did you forget to activate a virtual environment? 

我需要做什么？ 我已经尝试过卸载的Django，PIP的virtualenv并重新安装：

sudo apt-get install python3-pip 
sudo pip3 install virtualenv 
sudo virtualenv ENV 
source newenv/bin/activate 
sudo -H pip3 install django 

Answer 1

使用sudo与virtualenvs会导致大量的范围问题，以及virtualenvs的美德是，你不应该需要root权限为他们（在大多数情况下）。

此外，如果你已经安装了virtaulenv为Python 2中，也可能会被默认为一个。

sudo apt-get install python3-pip 
sudo pip3 install virtualenv 

# I prefer using this over `virtualenv --python=/usr/bin/python3 ENV` 
python3 -m venv ENV 
source ENV/bin/activate 

# Can do a `which pip3` here to make sure it's using the ENV one 
pip3 install django 

# Could also do full path of `ENV/bin/pip3 install django`