sed - Replace string in linux bash

I am writing a bash script for installing django with postgresql database automatically.
Now , I want to replace database name by command ,since it is using sqlite3 database file path.

I wrote this command:

sudo sed -i 's/os.path.join(BASE_DIR, 'db.sqlite3'),/'$project_name',/g' $projects_name/settings.py

But this is not changed while I am making the django project.

How to change this , please help me.

Answer

Use double-quotes around sed for variable expansion & to preserve single quotes.

sed -i "s/os.path.join(BASE_DIR, 'db.sqlite3'),/$project_name,/g" "$project_name/settings.py"

tested working fine on GNU sed version 4.2.1