[WIP] Python3 support - Django

.gitignore

@@ -1,3 +1,10 @@
 *.swp
 *.~
 *.py[co]
+__pycache__/
+.idea/
+nohup.out
+.gcloudignore
+cloud_sql_proxy
+.vscode/
+.fuse_hidden*

.gitmodules

@@ -1,9 +1,9 @@
 [submodule "sympy"]
 	path = sympy
-	url = git://github.com/sympy/sympy.git
+	url = https://github.com/sympy/sympy.git
 [submodule "mpmath"]
 	path = mpmath
 	url = https://github.com/fredrik-johansson/mpmath
 [submodule "static"]
 	path = static
-	url = git@github.com:sympy/sympy-web-static.git
+	url = https://github.com/sympy/sympy-web-static.git

README.rst

@@ -48,6 +48,87 @@ We use submodules to include external libraries in sympy-live::
 This is sufficient to clone appropriate repositories in correct versions
 into sympy-live (see git documentation on submodules for information).
 
+Setting Up for Testing PR 144
+-----------------------------
+Here are the steps to be followed for testing the PR 
+https://github.com/sympy/sympy-live/pull/144. The following are 
+the steps to be followed for Ubuntu. The steps for other Operating Systems 
+could be reproduced similiarly.
+
+You must have python3 installed. You can check your version by::
+
+    $ python3 -V
+
+The version must be greater than 3.4. If not present you can install it by::
+
+    $ sudo apt install python3
+
+You need to create the virtual environment and activate it::
+
+    $ sudo apt-get install python3-venv
+    $ python3 -m venv env
+    $ source env/bin/activate
+
+SymPy Live uses MySQL for database purpose. So you need to setup mysql::
+
+    $ sudo apt-get install mysql-server
+    $ sudo apt-get install libmysqlclient-dev
+    $ sudo apt-get install python3-dev
+    $ sudo systemctl start mysql
+    $ sudo mysql
+
+This will open mysql. You will now have to create a new database with name 
+{database_name}. Create a new user {user_name} and password {user_password}.
+Grant all previleges to {user_name} on {database_name}::
+
+    mysql> CREATE DATABASE {database_name};
+    mysql> CREATE USER '{user_name}'@'localhost' IDENTIFIED BY '{user_password}';
+    mysql> FLUSH PRIVILEGES;
+    mysql> GRANT ALL PRIVILEGES ON *.* TO '{user_name}'@'localhost' IDENTIFIED BY '{user_password}';
+
+These are the steps for MySQL v8.0.19. The above steps could be bit different for 
+you depending on the version of MySQL. You can check the MySQL documentation for 
+help. Using MySQL is not a compulsion. You can use any other DataBase for testing 
+but you must properly configure it.
+
+To ensure that the database server launches after a reboot, run the following command::
+
+    $ sudo systemctl enable mysql
+
+Now in settings.py set up the database for MySQL::
+
+    DATABASES = {
+        'default': {
+            'ENGINE': 'django.db.backends.mysql',
+            'HOST': '127.0.0.1',    # DataBase's IP address
+            'PORT': '3306',
+            'NAME': '{database_name}',
+            'USER': '{user_name}',
+            'PASSWORD': '{user_password}',
+        }
+    }
+
+Install dependencies from requirements.txt::
+
+    $ pip install -r requirements.txt
+
+Migrate the changes so that all DataBase tables are created::
+
+    $ python3 manage.py makemigrations
+    $ python3 manage.py migrate
+    $ python3 manage.py createsuperuser     # Admin. It will be used to login into admin panel
+
+And finally you need to run the server::
+
+    $ python3 manage.py runserver
+
+This runs the site on localhost. But before using the SymPy Live go to 
+admin panel http://127.0.0.1:8000/admin/. Login using the Admin details. 
+There you need to create new user 'anonymous'. You can keep password 
+anything but name must be exactly same as 'anonymous'.
+
+Congratulations, now you can test the SymPy Live.
+
 Development server
 ------------------
 

app.yaml

@@ -1,15 +1,5 @@
-application: sympy-live-hrd
-version: 58
-
-runtime: python27
-threadsafe: true
-api_version: 1
-
-libraries:
-- name: numpy
-  version: latest
-- name: matplotlib
-  version: latest
+runtime: python37
+entrypoint: gunicorn -b :8080 sympy_live.wsgi
 
 handlers:
 # redirect Sphinx extension
@@ -52,5 +42,6 @@ handlers:
 # endpoint where you want the shell to run, e.g. /shell . You'll also probably
 # want to add login: admin to restrict to admins only.
 - url: .*
-  script: shell.application
+#  script: shell.application
+  script: auto
   secure: always

index.yaml

@@ -0,0 +1,23 @@
+indexes:
+
+# AUTOGENERATED
+
+# This index.yaml is automatically updated whenever the dev_appserver
+# detects that a new type of query is run.  If you want to manage the
+# index.yaml file manually, remove the above marker line (the line
+# saying "# AUTOGENERATED").  If you want to manage some indexes
+# manually, move them above the marker line.  The index.yaml file is
+# automatically uploaded to the admin console when you next deploy
+# your application using appcfg.py.
+
+- kind: Searches
+  properties:
+  - name: private
+  - name: timestamp
+    direction: desc
+
+- kind: Searches
+  properties:
+  - name: user_id
+  - name: timestamp
+    direction: desc

manage.py

@@ -0,0 +1,21 @@
+#!/usr/bin/env python
+"""Django's command-line utility for administrative tasks."""
+import os
+import sys
+
+
+def main():
+    os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'sympy_live.settings')
+    try:
+        from django.core.management import execute_from_command_line
+    except ImportError as exc:
+        raise ImportError(
+            "Couldn't import Django. Are you sure it's installed and "
+            "available on your PYTHONPATH environment variable? Did you "
+            "forget to activate a virtual environment?"
+        ) from exc
+    execute_from_command_line(sys.argv)
+
+
+if __name__ == '__main__':
+    main()

requirements.txt

@@ -0,0 +1,7 @@
+Django==3.0.4
+django-cors-headers==3.2.1
+gunicorn==20.0.4
+matplotlib==3.2.0
+mysqlclient==1.4.6
+numpy==1.18.1
+scipy==1.4.1