pytz install on Mac

Django informs me "ImportError: No module named pytz", but when I go to use pip to install it, I get this result:

Requirement already satisfied (use --upgrade to upgrade): pytz in /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python

Is it possible that it is looking in the wrong location, or that I need to try to install it somewhere else?

Here is the full stacktrace:

Internal Server Error: /basicloginwebservice/
Traceback (most recent call last):
  File "/Library/Python/2.7/site-packages/django/core/handlers/base.py", line 103, in get_response
    resolver_match = resolver.resolve(request.path_info)
  File "/Library/Python/2.7/site-packages/django/core/urlresolvers.py", line 321, in resolve
    sub_match = pattern.resolve(new_path)
  File "/Library/Python/2.7/site-packages/django/core/urlresolvers.py", line 223, in resolve
    return ResolverMatch(self.callback, args, kwargs, self.name)
  File "/Library/Python/2.7/site-packages/django/core/urlresolvers.py", line 230, in callback
    self._callback = get_callable(self._callback_str)
  File "/Library/Python/2.7/site-packages/django/utils/functional.py", line 29, in wrapper
    result = func(*args)
  File "/Library/Python/2.7/site-packages/django/core/urlresolvers.py", line 97, in get_callable
    mod = import_module(mod_name)
  File "/Library/Python/2.7/site-packages/django/utils/importlib.py", line 35, in import_module
    __import__(name)
  File "/Users/<redacted>/django/<redacted>/<redacted>/views.py", line 3, in <module>
    import pytz
ImportError: No module named pytz

Thanks

/System/Library/Frameworks/Python.framework/Versions/2.7/Extras is a location associated with the Apple-supplied Python 2.7 (/usr/bin/python2.7). It's not possible to tell from the traceback but chances are that Django is being run under a different instance of Python 2.7, perhaps linked to from /usr/local/bin. These sorts of problems can arise when there are multiple instances of Python and you are using pip directly from the command line. Make sure you have a version of pip installed for each Python you are using. And, to ensure that you are using the right instance of pip, you can invoke it this way:

python -m pip install pytz

substituting for python the same path that is used to run Django.

Another approach is to always use an activated virtualenv which should ensure that the right python and pip instances are found first on the process PATH.