刪除文件中低於特定閾值的波段

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()

該代碼將獲取樂隊的名稱和樂譜並將其寫入文件。

如果他們的分數低於用戶給出的某個閾值，它應該刪除文件中樂隊的詳細信息。 希望你能幫忙。

先感謝您

Answer 1

為什么要先編寫文件，然后才嘗試過濾它？ 文件 I/O 操作在您的邏輯中是更昂貴的操作，因此您應該盡量減少它們。 您應該在其他輸入之前詢問閾值，然后在文件寫入循環中添加一個條件：

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(  ))

顯然，您需要進行多種數據類型和范圍檢查才能使程序健壯，但基本邏輯是這樣的。