删除文件中低于特定阈值的波段

Question

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()

代码会将乐队的名称和乐谱写入文件。

如果乐队的分数低于用户给定的某个阈值，则它应该在文件中删除乐队的详细信息。希望你能帮忙。

提前谢谢你

Answer 1

为什么要先编写文件，然后才尝试过滤它？文件 I/O 操作在您的逻辑中是更昂贵的操作，因此您应该尽量减少它们。您应该在其他输入之前询问阈值，然后在文件写入循环中添加一个条件：

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(  ))

显然，您需要进行多种数据类型和范围检查才能使程序健壮，但基本逻辑是这样的。