Looping to Create Nested Dictionary

[squenson]

Let's go back to your initial code and initial output

        outerdict[key] = innerdict 
 
        innerdict["number"] = line_tuple[0]
        innerdict["grade"] = line_tuple[2]
        innerdict["total"] = line_tuple[3]
        innerdict["weight"] = line_tuple[4]

From the output, we see that we have the right data of the third record, three times. This is "normal" because, as I said, the keys of outerdict point to innerdict and not its hard values.

Let's slightly reorganize the code by first populating innerdict, then assign it to the outerdict:

        innerdict["number"] = line_tuple[0]
        innerdict["grade"] = line_tuple[2]
        innerdict["total"] = line_tuple[3]
        innerdict["weight"] = line_tuple[4]

        outerdict[key] = innerdict 

And finally, how to tell python to copy the hard values of innerdict? You can use the following way:

        outerdict[key] = dict(innerdict) 

(Note: to be fully correct, this statement is OK for making a copy of a "simple" dictionary which itself doesn't contain any complex objects like a list or a dictionary. For such cases, do a research on "copy" and "deepcopy")