Python 删除文件中低于特定阈值的带区

代码将把乐队的名字和分数写入一个文件

然后，如果乐队的分数低于用户给定的某个阈值，它应该删除文件中乐队的详细信息。希望你能帮忙

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提前感谢

为什么要先编写文件，然后再尝试过滤？文件I/O操作在您的逻辑中是比较昂贵的操作，所以您应该尽量减少它们。您应该在其他输入之前请求阈值，然后在文件写入循环中添加一个条件：

numberofbands = int(input("How many bands are there in the competition? "))



print("Input each band’s name pressing enter after each one") 

file = open("scores.txt","w") 
for loop in range(numberofbands): 
  name = input("\nEnter the name of the band: ") 
  votes = input("Enter how many votes that band received: ")
  file.write(name + "," + votes + "," + "\n") 
file.close() 

number_of_lines = len(open("scores.txt").readlines(  ))

def removebelowthreshold():
   threshold = int(input("Choose the threshold of scores to remove bands which are below"))


removebelowthreshold()

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显然，要使程序健壮，您需要进行多种数据类型和范围检查，但基本逻辑是这样的。

所以您要求我们为您编写完整的逻辑？如果您尝试一下会好得多，只有当您无法让它工作时，您才应该发布一个供我们帮助的帖子。@ShadowRanger我可以通过data=line.split（“，”）和data[1]>threshold:，来查询文件。但是，我不知道如何从文件中删除这些行。感谢您的回复。我需要打印所有乐队的批发文件，然后使用单独的功能，打印乐队的名称和分数高于阈值，并删除其他乐队。所以你的建议是不可能的。在这种情况下，生成两个文件——一个是完整的列表，另一个是经过筛选的文件。仍然只有2个文件写入，而不是2个文件写入+1个文件读取，这是您想要的方法。很抱歉，这是持久性的，但问题是，我需要用户在生成文件后，在将调用的函数中输入阈值。

threshold = int(input("Choose the threshold of scores to remove bands which are below"))

numberofbands = int(input("How many bands are there in the competition? "))

print("Input each band’s name pressing enter after each one") 

file = open("scores.txt","w") 
for loop in range(numberofbands): 
    name = input("\nEnter the name of the band: ") 
    votes = input("Enter how many votes that band received: ")
    if int(votes) >= threshold:
        file.write(name + "," + votes + ",\n") 
file.close() 

number_of_lines = len(open("scores.txt").readlines(  ))