How to run a django project without manage.py
Most likely, this is not supposed to be a complete project, but a plugin application. You should create your own project in the normal way with django-admin.py startproject and add the downloaded app to INSTALLED_APPS.
Basically I downloaded django project from SCM, Usually I run the project with with these steps

git clone repository
extract
change directory to project folder
python manage.py runserver 

But this project does not contains manage.py , how to run this project in my local machine???
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