"Unknown command syncdb" running "python manage.py syncdb"
Alternarte Way:

Uninstall Django Module from environment
Edit Requirements.txt a type Django<1.9
Run Install from Requirments option in the enviroment
Try Syncdb again

This worked for me.
I want to create the tables of one database called "database1.sqlite", so I run the command: 

python manage.py syncdb

but when I execute the command I receive the following error:

Unknown command: 'syncdb'
  Type 'manage.py help' for usage.

But when I run 

manage.py help 

I don`t see any command suspicious to substitute 

python manage.py syncdb

Version of Python I use: 3.4.2    Version of Django I use:1.9 
I would be very grateful if somebody could help me to solve this issue.
Regards and thanks in advance