At the parcel station, a tracking code that starts with EX is an express parcel and goes out first. Write is_express(code) to return True for express parcels and False otherwise. A lower-case ex start counts too; an empty string doesn't.
is_express("EX20391")→Trueis_express("PO55120")→Falsedef is_express(code):
# your code here: in upper case, check whether it starts with EX
return False
Run tries the examples. When they look right, Submit.