如果每个数字旁边都有一个字符串，如何使用此代码查找文件中的前5个最大数字？

Question

from heapq import nlargest

with open("winnernum.txt", "r") as f:
   numbers = [float(line.rstrip()) for line in f.readlines()]
   largest = nlargest(5, numbers)    
print(largest)

我已经测试了这个代码，如果每个数字旁边没有字符串，它就可以工作，因为我假设不能将字符串转换成浮点。字符串在那里是因为每个高分旁边都有一个用户名。该计划应打印出获胜者的名字和他们的得分前5名得分最高的球员。你知道吗

Answer 1

如果输入看起来像注释中描述的那样，则为运行示例：

from heapq import nlargest

test_str = """ ['katy'] 30
['max'] 45
['A'] 31
['B'] 4
['D'] 1
['C'] 15
['E'] 333"""

numbers = [float(line.rstrip().split("]")[1]) for line in test_str.split("\n")]
largest = nlargest(5, numbers)
print(largest)

在您的情况下，您可以这样做：

from heapq import nlargest

with open("winnernum.txt", "r") as f:
   numbers = [float(line.rstrip().split("]")[1]) for line in f.readlines()]
   largest = nlargest(5, numbers)    
print(largest)

编辑

避免空行或不带“]”的行

numbers = []
with open("winnernum.txt", "r") as f:
    for line in f.readlines():
        split = line.rstrip().split("]")
        if len(split) > 1:
            numbers.append(float(split[1]))