You can use a Python dictionary is a built-in type that supports key-value pairs.
streetno = {"1":"Hello Worls", "2":"World", "3":"Hello", "4":"abcd","5":"lpg"}
as well as using the dict keyword:
streetno = dict({"1":"Hello Worls", "2":"World"})
or:
streetno = {}
streetno["1"] = "Hello Worls"
To know more about this you can have a look at the following video tutorial:-