如何从列表中删除方括号？ 通过使用条带 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)

这是我的 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

如何删除它周围的方括号？

Answer 1

print(",".join(list))

或者

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

Answer 2

您只有一个列表内的列表。 这是正常的，因为日历可以显示为事件列表，每个事件由一个名称和一个日期组成，可以存储为列表。

要打印您添加到日历中的最后一个事件，您可以使用print(calendar[-1]) 。

它们是您程序中的一些问题：

• 一开始，您以f的形式以写入模式打开日历，然后以f的形式以读取模式重新打开它，而无需对其调用close() 。
• 当您以读取模式打开文件时，您会在 for 循环中执行此操作，并且每次都重新分配相同的变量。 这是没用的。

为了使您的程序更简单：

• 不要一开始就打开文件。
• 当用户输入事件的名称时，将其存储在包含日期的列表中，然后再将其插入日历中，这样您就不必解析所有日历来添加日期。

这是您的程序的重构版本：

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

您还可以在 python 中阅读有关CSV 格式和CSV 解析的信息。