Question: read the data contained in the file referenced by the parameter filename and return a * list of tuples * representing the data that will

read the data contained in the file referenced by the parameter filename
and return a *list of tuples* representing the data
that will look like this: [('DD',1085),('DIS',1213),('GE',1781),('GS',1913),..]
This is the list referenced as portfolio in the other functions below

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