how Upload image in django and how to read file dimensions

[arvind yadav]

my views.py in admin.py file

def changelist_view(self, request, extra_context=None,):
    extra_context = extra_context or {}
    if request.method == 'POST':
        #extra_context['form'] ='form'
        form = HomePageBannerForm(request.POST, request.FILES)
        if form.is_valid():
            data = request.FILES.get('file')
            from django.core.files.images import get_image_dimensions
            from PIL import Image
            im = Image.open('data')
            width, height = im.size
            print(width, height,'>>>>>>>') here i want size of image
            #form.save();

    else:
        form = HomePageBannerForm()
        extra_context['form'] = HomePageBannerForm()
    return super(HomePageBannerAdmin, self).render_change_form(request, extra_context)

my form.html

<form method="post" enctype="multipart/form-data">
  {% csrf_token %}
  {{ form.as_p }}
  <button type="submit">Upload</button>
</form>

facing this error on submit 
error section 



Internal Server Error: /homepage/homepagebanner/
Traceback (most recent call last):
  File "/home/arvind/lib/python3.5/site-packages/django/core/handlers/exception.py", line 35, in inner
    response = get_response(request)
  File "/home/arvind/lib/python3.5/site-packages/django/core/handlers/base.py", line 128, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/arvind/lib/python3.5/site-packages/django/core/handlers/base.py", line 126, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/arvind/lib/python3.5/site-packages/django/contrib/admin/options.py", line 574, in wrapper
    return self.admin_site.admin_view(view)(*args, **kwargs)
  File "/home/arvind//admin/main/admin.py", line 71, in inner
    safeview = view(request, *args, **kwargs)
  File "/home/arvind//admin/homepage/admin.py", line 72, in changelist_view
    im = Image.open('data')
  File "/home/arvind/lib/python3.5/site-packages/PIL/Image.py", line 2543, in open
    fp = builtins.open(filename, "rb")
IsADirectoryError: [Errno 21] Is a directory: 'data'

[pradam]

 data = request.FILES.get('file')
 from django.core.files.images import get_image_dimensions
 from PIL import Image

 im = Image.open(data) ---> No Quotes just pass the data here.

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