如何從列表中刪除方括號？ 通過使用條帶 function

Question

 calendar = []

f = open("calendar.txt","w")

while True:
    choice = input ("enter a,b,c,d or e")
    if choice == "e":
        print ("you have quitted this program")
        break #to quit the entire program
    if choice == "a":
        newevent = input ("enter the name of an event you want to add")
        calendar.append ([newevent]) 
        y= int(input("enter the year of your event"))
        m = int(input("enter the month of your event"))
        d = int(input("enter the day of your event"))
        h = int(input("enter the hour of your event"))
        mi = int(input("enter the minute of your event"))
        date = (y,m,d,h,mi)

    for i in range (0,len(calendar)):
        f = open("calendar.txt","r")
        st = f.readlines()
    
    for y in range (0,len(st)):
        st[y] = st[y].strip("\n")
        st[y]= st[y].split(",")
        st[y][1]=int(st[y][1])
        f.close()

    for x in range (0,len(calendar)):
        if calendar[x][0]== newevent:
            calendar[x].append (date)
            print (calendar)

這是我的 output：

enter a,b,c,d or ea
enter the name of an event you want to addswim
enter the year of your event2020
enter the month of your event2
enter the day of your event2
enter the hour of your event2
enter the minute of your event2
[['swim', (2020, 2, 2, 2, 2)]]
enter a,b,c,d or e

如何刪除它周圍的方括號？

Answer 1

print(",".join(list))

或者

print(str(list)[1:-1])

Answer 2

您只有一個列表內的列表。 這是正常的，因為日歷可以顯示為事件列表，每個事件由一個名稱和一個日期組成，可以存儲為列表。

要打印您添加到日歷中的最后一個事件，您可以使用print(calendar[-1]) 。

它們是您程序中的一些問題：

• 一開始，您以f的形式以寫入模式打開日歷，然后以f的形式以讀取模式重新打開它，而無需對其調用close() 。
• 當您以讀取模式打開文件時，您會在 for 循環中執行此操作，並且每次都重新分配相同的變量。 這是沒用的。

為了使您的程序更簡單：

• 不要一開始就打開文件。
• 當用戶輸入事件的名稱時，將其存儲在包含日期的列表中，然后再將其插入日歷中，這樣您就不必解析所有日歷來添加日期。

這是您的程序的重構版本：

while True:
    choice = input("Enter Q to quit, A to add a new event : ").upper()
    if choice == 'Q':
        print ("You have quitted this program")
        break #to quit the entire program
    elif choice == 'A':
        name = input ("Enter the name of an event you want to add : ")
        y= int(input("Enter the year of your event: "))
        m = int(input("Enter the month of your event: "))
        d = int(input("Enter the day of your event: "))
        h = int(input("Enter the hour of your event: "))
        mi = int(input("Enter the minute of your event: "))
        date = (y,m,d,h,mi)
        
        # Opening the file in append mode
        f = open("calendar.txt", 'a', encoding='utf-8')
        f.write('{},{},{},{},{},{}\n'.format(name, date[0], date[1], date[2], date[3], date[4]))
        f.close()
        
    print("------ ALL YOUR EVENTS ------")
    # Showing the entire calendar
    f = open("calendar.txt","r")

    for event in f.readlines():
        split = event.split(',')
        print("{} happens on {}/{}/{} at {}:{}".format(split[0],
                                                       int(split[1]),
                                                       int(split[2]),
                                                       int(split[3]),
                                                       int(split[4]),
                                                       int(split[5])
                                                       ))
    print('-----------------------------')

和 output：

Enter Q to quit, A to add a new event : A
Enter the name of an event you want to add : Christmass
Enter the year of your event: 2020
Enter the month of your event: 12
Enter the day of your event: 25
Enter the hour of your event: 0
Enter the minute of your event: 0
Christmass,(2020, 12, 25, 0, 0)
My birthday,(1997, 1, 1, 6, 45)


C:\Users\tcravic\Downloads>python test.py

C:\Users\tcravic\Downloads>python test.py
Enter Q to quit, A to add a new event : A
Enter the name of an event you want to add : Christmass
Enter the year of your event: 2020
Enter the month of your event: 12
Enter the day of your event: 25
Enter the hour of your event: 0
Enter the minute of your event: 0
------ ALL YOUR EVENTS ------
Christmass happens on 2020/12/25 at 0:0
-----------------------------
Enter Q to quit, A to add a new event : A
Enter the name of an event you want to add : My Birthday
Enter the year of your event: 1997
Enter the month of your event: 03
Enter the day of your event: 01
Enter the hour of your event: 6
Enter the minute of your event: 45
------ ALL YOUR EVENTS ------
Christmass happens on 2020/12/25 at 0:0
My Birthday happens on 1997/3/1 at 6:45
-----------------------------
Enter Q to quit, A to add a new event : q
You have quitted this program

您還可以在 python 中閱讀有關CSV 格式和CSV 解析的信息。