当我写pip list时，在那里可以看到django。当我在python shell中编写import django时，没有错误。但是当我写python manage.py runserver时，出现以下错误：
Unhandled exception in thread started by <function wrapper at 0x105838b18>
Traceback (most recent call last):
File "/Users/manitgupta/virtualenvs/testify/lib/python2.7/site-packages/django/utils/autoreload.py", line 227, in wrapper
fn(*args, **kwargs)
File "/Users/manitgupta/virtualenvs/testify/lib/python2.7/site-packages/django/core/management/commands/runserver.py", line 117, in inner_run
autoreload.raise_last_exception()
File "/Users/manitgupta/virtualenvs/testify/lib/python2.7/site-packages/django/utils/autoreload.py", line 250, in raise_last_exception
six.reraise(*_exception)
File "/Users/manitgupta/virtualenvs/testify/lib/python2.7/site-packages/django/utils/autoreload.py", line 227, in wrapper
fn(*args, **kwargs)
File "/Users/manitgupta/virtualenvs/testify/lib/python2.7/site-packages/django/__init__.py", line 27, in setup
apps.populate(settings.INSTALLED_APPS)
File "/Users/manitgupta/virtualenvs/testify/lib/python2.7/site-packages/django/apps/registry.py", line 85, in populate
app_config = AppConfig.create(entry)
File "/Users/manitgupta/virtualenvs/testify/lib/python2.7/site-packages/django/apps/config.py", line 127, in create
import_module(entry)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/importlib/__init__.py", line 37, in import_module
__import__(name)
ImportError: No module named django