Question

我正在尝试使用Python中的pickle而且我失败了。对于我克服的每个错误，我得到另一个消息。我运行代码时收到以下消息。我使用'else'时出现语法错误。那是为什么？

我是Python的新手，但我无法弄清楚我做错了什么？

import pickle

def main():
    file_mail = open('email.dat','wb')
    save_data(file_mail)
    file_mail.close()


def save_data(file):
    email = {}

    count = 0

    while count == 0:
        print('Add an email: 1')
        print('Modify an email: 2')
        print('Delete an email: 3')
        print('Display the list: 4\n')

        choice = input('Enter a number from the list above:')

        if int(choice)== 1:
            name = input('Name:')
            mail = input('E-mail:')
            email[name] = mail
            print('Added Successfully')

            if int(choice) == 2:
                name = input('Name:')
                mail = input('E-mail:')
                email[name] = mail
                print('Modified Successfully')

                if int(choice) == 3:
                    name = input('Name:')
                    mail = input('E-mail:')
                    email[name] = mail
                    print('Deleted Successfully')

                    if int(choice) == 4:
                        print(email)

                        else:
                            print('Invalid selection')
                            c = input('Do you want to continue y/n: ')

                            if c.upper() == 'N':
                                count = 1
                                print('Invalid Letter')
                                file_mail = open('email.dat','wb')
                                pickle.dump(email,file_mail)
                                file_mail.close()
main()

Answer 1

在阅读含有pickle的文件时尝试使用rb模式：

file_mail = open('email.dat','rb')
email = pickle.load(file_mail)

在将obj的pickle表示写入打开的文件对象时使用wb模式：

output = open('data.pkl', 'wb')
pickle.dump(data1, output)

查看pickle example的更多详情。

Answer 2

谢谢@McGrady！这是我得到的最终答案。

import pickle

def main():
    file_mail = open('email.dat','wb')
    save_data(file_mail)
    file_mail.close()


def save_data(file):
    email = {}

    count = 0

    while count == 0:
        print('Add an email: 1')
        print('Modify an email: 2')
        print('Delete an email: 3')
        print('Display the list: 4\n')

        choice = input('\nEnter a number from the list above:')

        if int(choice)== 1:
            name = input('Name:')
            mail = input('E-mail:')
            email[name] = mail
            print('Added Successfully\n')

        else:
            if int(choice) == 2:
                name = input('Name:')
                mail = input('E-mail:')
                if name in email:
                    email[name] = mail
                    print('Modified Successfully\n')
                else:
                    print('Name not found')

            else:
                if int(choice) == 3:
                    name = input('Enter name you want to delete:')
                    if name in email:
                        email.pop(name)
                        print('Deleted Successfully\n')
                    else:
                       print('Name not found') 
                else:
                    if int(choice) == 4:
                        print(email)

                    else:
                        print('Invalid selection\n')
                        c = input('Do you want to continue y/n: ')
                        if c.upper() == 'N':
                            count = 1
                        else:
                            if c.upper() == 'N':
                                count = 1
                                print('Invalid Letter')

            file_mail = open('email.dat','wb')
            pickle.dump(email,file_mail)
            file_mail.close()
main()

在Python中使用泡菜

2 个答案: