6. What are the names of the winners?

6.1. Using another list

• We can use two lists to find out.

• The names and scores lists to save the names and scores obtained by the participants respectively.

Data file: surf4_en.txt

Johny 8.65
Juan 9.12
Joseph 8.45
Stacey 7.81
Aideen 8.05
Zack 7.21
Aaron 8.31

file = open("surf4_en.txt") scores = [] names = [] for line in file: name, points = line.split() scores.append(float(points)) names.append(name) file.close() scores.sort(reverse=True) names.sort(reverse=True) print(f"1. {names[0]} {scores[0]:.2f}") print(f"2. {names[1]} {scores[1]:.2f}") print(f"3. {names[2]} {scores[2]:.2f}")

6.2. But these data are incorrect!

• There must be a problem because Zack is really bad!

• What happened?

• By sorting the names list in decreasing order, the character 'Z' ends up being the first.

• The correspondence between scores and the names of the participants is lost.

• Another data structure is needed to avoid losing the correspondence.

6.3. We need to join the lists

6.4. Using and sorting a dictionary

• Using a dictionary and seeing all its elements iteratively.

Activity: CodeLens 6.4.1 (cl_l37_6_en)

• Using a dictionary for the championship.

file = open("surf4_en.txt") scores = {} for line in file: name, points = line.split() scores[float(points)] = name file.close() for participant in sorted(scores, reverse=True): print(f"{scores[participant]} obtained a score of {participant:.2f}")

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