title: ModuleNotFoundError: No module named 'rest_framework' I already installed djangorestframework
body: <p>I got an error,ModuleNotFoundError: No module named 'rest_framework' when I run command <code>python manage.py runserver</code> .
  Traceback says</p>
  
  <pre><code>Unhandled exception in thread started by &lt;function check_errors.&lt;locals&gt;.wrapper at 0x108193ae8&gt;
  Traceback (most recent call last):
    File "/Users/xxx/anaconda/envs/env/lib/python3.6/site-packages/django/utils/autoreload.py", line 226, in wrapper
      fn(*args, **kwargs)
    File "/Users/xxx/anaconda/envs/env/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 113, in inner_run
      autoreload.raise_last_exception()
    File "/Users/xxx/anaconda/envs/env/lib/python3.6/site-packages/django/utils/autoreload.py", line 249, in raise_last_exception
      six.reraise(*_exception)
    File "/Users/xxx/anaconda/envs/env/lib/python3.6/site-packages/django/utils/six.py", line 685, in reraise
      raise value.with_traceback(tb)
    File "/Users/xxx/anaconda/envs/env/lib/python3.6/site-packages/django/utils/autoreload.py", line 226, in wrapper
      fn(*args, **kwargs)
    File "/Users/xxx/anaconda/envs/env/lib/python3.6/site-packages/django/__init__.py", line 27, in setup
      apps.populate(settings.INSTALLED_APPS)
    File "/Users/xxx/anaconda/envs/env/lib/python3.6/site-packages/django/apps/registry.py", line 85, in populate
      app_config = AppConfig.create(entry)
    File "/Users/xxx/anaconda/envs/env/lib/python3.6/site-packages/django/apps/config.py", line 116, in create
      mod = import_module(mod_path)
    File "/Users/xxx/anaconda/envs/env/lib/python3.6/importlib/__init__.py", line 126, in import_module
      return _bootstrap._gcd_import(name[level:], package, level)
    File "&lt;frozen importlib._bootstrap&gt;", line 978, in _gcd_import
    File "&lt;frozen importlib._bootstrap&gt;", line 961, in _find_and_load
    File "&lt;frozen importlib._bootstrap&gt;", line 948, in _find_and_load_unlocked
  ModuleNotFoundError: No module named 'rest_framework'
  </code></pre>
  
  <p>I already run command <code>pip3 install djangorestframework</code>,when I run this command again, Requirement already satisfied: djangorestframework in /usr/local/lib/python3.6/site-packages shows in terminal.Python version is 3.6.2.What is wrong in my code?How should I fix this?I use Anaconda virtual environment.</p>