Subtracting by Dictionary Values from Iterated Total in For Loop Python

Question

Working in Python 2.7.

I have a dictionary with team names as the keys and the values are contained in lists. The first value is the amount of runs the team scored, the second is runs allowed:

NL = {'Phillies': [662, 476], 'Braves': [610, 550], 'Mets': [656, 687]}

I have a function that iterates over each key and provides the total runs scored and allowed for the dictionary as a whole. I would also like to be able to subtract each individual team from the total, and create a league minus team value.

I first tried something along the lines of this:

def Tlog5(league, league_code):
    total_runs_scored = 0
    total_runs_allowed = 0
    for team, scores in league.iteritems():
        total_runs_scored += float(scores[0])
        total_runs_allowed += float(scores[1])
        team_removed_runs = total_runs_scored - scores[0]

Unfortunately, that appeared to be subtracting from only the values that had already been iterated instead of the complete total. So, for the first team in the dictionary, team_removed_runs was 0, for the second team it was the the total runs for of the first two teams minus the second teams total (leaving only the first teams total.

I tried to move the team_removed_runs = total_runs_scored - scores[0] out of the for loop, but then I only got a value for the last team in the dictionary.

Is there a way I can return the team_removed runs for all the teams in the dictionary?

Thanks for any help!

brc · Accepted Answer · 2011-09-18 05:47:03Z

6

If you want the team_removed_runs for every team in the dictionary, you'll need to go back through the dictionary and compute the total number of runs minus the runs for each team. Something like

team_removed_runs = {}
for team, scores in league.iteritems():
    team_removed_runs[team] = [total_runs_scored - scores[0],
                               total_runs_allowed - scores[1]]

This will use the final values of total_runs_scored and total_runs_allowed for the entire league, and then subtract each teams values from that total, storing the result in the dictionary team_removed_runs. So if you wanted the value for the league total less the Phillies, you could find this at

team_removed_runs['Phillies']

answered Sep 18, 2011 at 5:47

brc

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2 Comments

Burton Guster Over a year ago

I still have the same problem. Because total_runs_scored hasn't been stored yet, for the first team the function returns 0, because it's subtracting the first teams total from the total_runs_scored, which at that point only contains the first teams total. Thanks for the help, though.

brc Over a year ago

Add the code I wrote after the code you wrote, so you have two for loops. See pastebin of full code.

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