> I have data about zip codes, street and city names (and perhaps later also of
> street numbers). I made a dictionary of the form {zipcode: (street, city)}
One dictionary with all of the data?
That does not seem like it will work. What happens when
2 addresses have the same zip code?
> Are there forms of object permanence that do not read all data into memory?
How about a file?
You could write your data one record per line, and then
read it in one line at a time also.
You could also use a csv file, or maybe use a database
like sqlite.
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