Modifying multiple files in one stroke

The other day, I was working on code and felt that I had to change the date creation function and make use of SQLAlchemy's server_default = text("sysdate") from a rather bizare default = datetime.now()

so I run this;

sed -e 's/default = datetime.now()/server_default = text("sysdate")/g' -i models/*.py

and all python files were updated

Note: the letter g at the after the replacement text ensures that all instances of the
text to be replaced are actually replaced and not only the first instance if the g (global) were left out