6. What are the names of the winners? — PyZombis scorm

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}")
​

Activity: 6.1.2 ActiveCode (ac_l37_6a_en)

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.

	1	scores = {}
	2	scores[9.12] = "Juan"
	3	scores[7.21] = "Zack"
	4
	5	for participant in sorted(scores, reverse=True):
	6	print(f"{scores[participant]} {participant:.2f}")

line that just executed

next line to execute

Step 1 of 8

Python Tutor by Philip Guo

Customize visualization (NEW!)

Print output (drag lower right corner to resize)

Frames

Objects

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}")
​

Activity: 6.4.2 ActiveCode (ac_l37_6b_en)

Activity: 6.4.3 Poll (TWP37E)

6. What are the names of the winners?¶

6.1. Using another list¶

6.2. But these data are incorrect!¶

6.3. We need to join the lists¶

6.4. Using and sorting a dictionary¶

Scratch ActiveCode