如何從python中的文本文件中刪除行

Question

各位程序員朋友們，

我有個問題

我用python寫了一個代碼，我們用密碼向人們注冊了一個保險箱

在菜單中有 4 個選項

第一個選項是查看剩余的保險箱數量（1 到 12 個）第二個選項是獲取一個保險箱，如果所有 12 個保險箱都在使用中，python 將回復“沒有保險箱可用”如果有保險箱可用將應用一個隨機保險箱號碼，您可以使用第三個選項添加密碼，您可以打開保險箱

使用第四個選項，如果你不想再使用它，你可以刪除它向上，以便沒有剩余空間。

要刪除您的保險箱，用戶需要輸入他的號碼，然后輸入他的密碼，如果它們與文本文件選項 4 中的行匹配，則只需刪除該行。

有人能幫助我嗎。

def kluis_teruggeven()：是第四個選項代碼所在的行

文本文件有

2;peter
3;johan
6;piet
7;cheese

我的python代碼：

import random
create_bestand = open('fa_kluizen.txt')
bestand = open('fa_kluizen.txt', 'r')
line = bestand.readlines()
bestand.close

def main():
    while True:
        menu = input("""    
        Welkom bij het menu!    
        1: Ik wil weten hoeveel kluizen nog vrij zijn 
        2: Ik wil een nieuwe kluis 
        3: Ik wil even iets uit mijn kluis halen 
        4: Ik geef mijn kluis terug   
        5: ik wil stoppen   

        Maak je keuze van 1/5: """)

        if menu == '1':
            toon_aantal_kluizen_vrij()
        elif menu == '2':
            nieuwe_kluis()
        elif menu == '3':
            kluis_openen()
        elif menu == '4':
            kluis_teruggeven()
        elif menu == '5':
            break
        else:
            print("Je kan alleen de nummers 1,2,3,4,5 selecteren\nprobeer opnieuw")
            print(type(main))

def toon_aantal_kluizen_vrij():
    available_safe = 12 - len(line)
    print(f'er zijn nog {available_safe} kluizen vrij ')
    return  available_safe

def nieuwe_kluis():
    safenumbers = ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12']
    file = open('fa_kluizen.txt', 'r')
    safes = file.readlines()
    for safe in safes:
        safe_split = safe.split(";")
        for safenumber in safe_split:
            if safenumber in safenumbers:
                safenumbers.remove(safenumber)
    if len(safenumbers) > 0:
        safe_number = random.choice(safenumbers)
        print(f'u heeft kluisnummer {safe_number} gekregen')
        password = input('voer een wachtwoord in voor uw kluis: ')
        appendsafe = open('fa_kluizen.txt', 'a')
        appendsafe.write(f'\n{safe_number};{password}')
        appendsafe.close()
        print(f'uw Kluis is {safe_number} toegewezen!')
    else:
        print('Alle kluizen zijn al gebruikt.')
    file.close()

def kluis_openen():
    while True:
        file = open('fa_kluizen.txt', 'r')
        safes = file.readlines()
        safenumber = input('voer uw kluisnummer hier in: ')
        password = input('voer uw wachtwoord van uw kluis hier in: ')
        safenumbercode = safenumber+';'+password
        for safe in safes:
            safe = safe.strip()
            if safenumbercode == safe:
                numbercode = True
                break
            else:
                numbercode = False
        if numbercode == True:
            print('Kluis is geopend')
            break
        else:
            print('De kluisnummer en/of wachtwoord is onjuist, probeer opnieuw.')
        file.close()

# 2;peter
# 3;johan
# 6;piet
# 7;amk

def kluis_teruggeven():
    while True:
        file = open('fa_kluizen.txt', 'r+')
        safes = file.readlines()
        safenumber = input('voer uw kluisnummer hier in: ')
        password = input('voer uw wachtwoord van uw kluis hier in: ')
        safenumbercode = safenumber + ';' + password
        for safe in safes:
            safe = safe.strip()
            if safenumbercode == safe:
                numbercode = True
                break
            else:
                numbercode = False
        if numbercode == True:
            if safe.strip("\n") != numbercode:
                safe.write(safe)
            print('Kluis is verwijderd')
            break
        else:
            print('De kluisnummer en/of wachtwoord is onjuist, probeer opnieuw.')
    file.close()

有人可以幫幫我嗎 ：（

Answer 1

在刪除保險箱功能中，文件已經打開，因此您可以清除文件並寫入新的保險箱列表，而無需選擇（刪除）保險箱。

def kluis_teruggeven():  # delete safe
    while True:
        file = open('fa_kluizen.txt', 'r+')
        safes = file.readlines()
        safenumber = input('voer uw kluisnummer hier in: ')
        password = input('voer uw wachtwoord van uw kluis hier in: ')
        safenumbercode = safenumber + ';' + password
        newlines = ""  # new file contents
        numbercode = False
        for safe in safes:
            safe = safe.strip()
            if safenumbercode != safe:
                newlines += safe + '\n'  # keep this safe
            else:
                numbercode = True  # found entry to be deleted
        if numbercode == True:
            file.truncate(0)  # clear file
            file.seek(0)
            file.write(newlines)  # write new contents
            print('Kluis is verwijderd')
            break
        else:
            print('De kluisnummer en/of wachtwoord is onjuist, probeer opnieuw.')
    file.close()

Answer 2

@邁克67

我有一個問題

在我的第二個選項中，如果你創建一個保險箱，我寫了 \\n 所以它開始在它下面寫，但是如果我打開文件，第一行是空的，因為第一個選項說在使用 1 個保險箱后還剩下 10 個保險箱而不是 11 個

我能做些什么來解決這個問題

def nieuwe_kluis():
    safenumbers = ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12']
    file = open('fa_kluizen.txt', 'r')
    safes = file.readlines()
    for safe in safes:
        safe_split = safe.split(";")
        for safenumber in safe_split:
            if safenumber in safenumbers:
                safenumbers.remove(safenumber)
    if len(safenumbers) > 0:
        safe_number = random.choice(safenumbers)
        print(f'u heeft kluisnummer {safe_number} gekregen')
        password = input('voer een wachtwoord in voor uw kluis: ')
        appendsafe = open('fa_kluizen.txt', 'a')
        appendsafe.write(f'\n{safe_number};{password}')
        appendsafe.close()
        print(f'uw Kluis is {safe_number} toegewezen!')
    else:
        print('Alle kluizen zijn al gebruikt.')
    file.close()