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)

this is my 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

how do I remove the square brackets around it?

Answer 1

print(",".join(list))

or

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

Answer 2

You just have a list inside a list. which is normal since a calendar can be shown as a list of events, each one composed of one name, and one date, that can be stored as a list.

To print the last event you added to your calendar, you can use print(calendar[-1]) .

They are some problems in your program:

• At the very begining, you open your calendar in write mode as f , then you re-open it in read mode, as f too, whithout calling close() on it.
• When you open the file in read mode, you do it in a for loop, and re-assign the same variable each time. This is useless.

To make your program simpler:

• Don't open the file at the begining.
• When the user enters the name of the event, store it in a list with the date before inserting it in the calendar, so you don't have to parse all the calendar to add the date.

Here is a refactored version of your program:

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('-----------------------------')

And the 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

You can also read about CSV format and CSV parsing in python .