Hi Sonia,

This is exactly what ERPpeek is made for (an external Python library). With ERPpeek you could do this in just a few lines of code. For example:

import erppeek
DATABASE = 'ErpPeekDemoDatabase'
SERVER = 'http://localhost:8080'
ADMIN_PASSWORD = 'admin'
client = erppeek.Client(server=SERVER)
if not DATABASE in client.db.list():
    print("The database does not exist yet, creating one!")
    client.create_database(ADMIN_PASSWORD, DATABASE)
else:
    print("The database " + DATABASE + " already exists."

You can also install modules with ERPpeek:

client = erppeek.Client('http://localhost:8080', 'ErpPeekDemoDatabase', 'admin', 'admin')
modules = client.modules('sale', installed=False)
if 'sale' in modules['uninstalled']:
    client.install('sale')

Another way you could do this is by custom development through Python but ERPpeek works fine here and you could already use all the functions that are made, which are very powerful.
I've made some example scripts which you can find here: https://github.com/Yenthe666/Odoo_Samples/tree/master/ErpPeekDemo

Yenthe