Update list of values in a dictionary (cumulative update)-CodePudding

Context: I have a dictionary with some soccer results and I'd like to create a second dictionary displaying the values as a list with the soccer match results.

For example, I have this initial dictionary:

dict_results = {('FCP', 'SLB'): (1, 4),
 ('FCP', 'SCP'): (2, 5),
 ('SLB', 'FCP'): (2, 6),
 ('SLB', 'SCP'): (1, 5),
 ('SCP', 'FCP'): (2, 4),
 ('SCP', 'SLB'): (1, 4)}

and I'd like to get this format:

tabela = {'FCP': [win, draw, loss, scored_goals, suff_goals, points],
 'SLB': [win, draw, loss, scored_goals, suff_goals, points],
 'SCP': [win, draw, loss, scored_goals, suff_goals, points]}

I was trying to do something like this:

tabela = {}

for teams,goals in dict_results.items():
    win = 0
    draw = 0
    loss = 0
    scored_goals = 0
    suff_goals = 0
    points = 0

    print(teams,goals)
    if teams[0] not in tabela:
        tabela[teams[0]] = [win, draw, loss, scored_goals, suff_goals, points]
    

    if goals[0] > goals[1]:
        #teams[0] update
        win = 1
        scored_goals = goals[0]
        suff_goals = goals[1]
        points = 3
        tabela[teams[0]].update([win,draw,loss,scored_goals,suff_goals,points])
    elif goals[0] == goals[1]:
        draw = 1
        scored_goals = goals[0]
        suff_goals = goals[1]
        points = 1
        tabela[teams[0]].update([win,draw,loss,scored_goals,suff_goals,points])
        tabela[teams[1]].update([win,draw,loss,scored_goals,suff_goals,points])
    elif goals[0] < goals[1]:
        ...

but the values are kept at 0 (they don't actually update) which makes sense really since every iteration I'm basically "resetting" the values and even if the values were being updated the way I'm trying to do, I wouldn't really get cumulative values.

How could I do it so that I can compare the goals for each team and update the results accordingly? For example, in the tuple ('FCP','SLB') the goals scored for 'FCP' were 1 and goals scored for SLB were 4, which means that 'FCP' suffered 4 goals, scored 1 goal, got no points, increased the loss by 1 and 'SLB' increase the win by 1, suffered 1 goal, scored 4 goals and got 3 points (without using dictionary or list comprehensions)

Thank you in advance!

CodePudding user response：

As an addition, you are looping over both teams but you are recording only the result for team one. You can get both teams with an extra for loop.


tabela = {}

for teams,goals in dict_results.items():
    for iter in range(len(teams)):
        team = teams[iter]
        win = 0
        draw = 0
        loss = 0
        scored_goals = 0
        suff_goals = 0
        points = 0
        
        if iter == 0:
            n = 0
            m = 1
        else:
            n = 1
            m = 0

        if team not in tabela:
            tabela[team] = [win, draw, loss, scored_goals, suff_goals, points]
        
        if goals[n] > goals[m]:
            win, draw, loss, scored_goals, suff_goals, points = tabela[team]
            win  = 1
            scored_goals  = goals[n]
            suff_goals  = goals[m]
            points  = 3
            tabela[team] = [win,draw,loss,scored_goals,suff_goals,points]
        elif goals[n] < goals[m]:
            win, draw, loss, scored_goals, suff_goals, points = tabela[team]
            win  = 0
            scored_goals  = goals[n]
            suff_goals  = goals[m]
            points  = 0
            tabela[team] = [win,draw,loss,scored_goals,suff_goals,points]
        elif goals[n] == goals[m]:
            win, draw, loss, scored_goals, suff_goals, points = tabela[team]
            win  = 0
            scored_goals  = goals[n]
            suff_goals  = goals[m]
            points  = 1
            tabela[team] = [win,draw,loss,scored_goals,suff_goals,points]
        

print(tabela)

 >>{'FCP': [2, 0, 0, 13, 13, 6], 'SLB': [2, 0, 0, 11, 13, 6], 'SCP': [2, 0, 0, 13, 11, 6]}

Depending on your iteration iter, n and m switch numbers. This way the if statement checks the scores for team one on iteration 1 and the scores for team two on iteration 2.

CodePudding user response：

You're right, it looks like you are indeed "resetting" the values on every iteration. In Python, the .update function doesn't add values, it just replaces the dictionary entry. You can still use tabela[team].update, you just need to add to the previous value yourself.

Here's a code example of how to do that:

    ...
    if goals[0] > goals[1]:
        #teams[0] update
        win, draw, loss, scored_goals, suff_goals, points = tabela[teams[0]]
        win  = 1
        scored_goals  = goals[0]
        suff_goals  = goals[1]
        points  = 3
        tabela[teams[0]].update([win,draw,loss,scored_goals,suff_goals,points])
    elif goals[0] == goals[1]:
        ...
    elif goals[0] < goals[1]:
        ...