Question

因此，对于练习，我尝试编写一个简单的程序来读取/写入来自终端/ python shell的电子邮件。我的问题是，每当我尝试输入无效的响应时，它都会结束程序，而不是返回主菜单，＆＃39;可以这么说。当我尝试选择退出程序并要求用户确认他们想要退出时，同样的问题。这是我的代码：

import smtplib
import imaplib
import email

print 'Welcome to NhuMail'
print '\n \nPlease enter your login information: \n'
user = raw_input('Email User:')
pw = raw_input("Password:")


def check_mail(user, pw):
    # Login to INBOX
    imap = imaplib.IMAP4_SSL("imap.gmail.com", 993)
    imap.login(user, pw)
    imap.select('INBOX')

    # Use search(), not status()
    status, response = imap.search('INBOX', '(UNSEEN)')
    unread_msg_nums = response[0].split()

    # Print the count of all unread messages
    print '\n\nYou have %s unread messages.' % (len(unread_msg_nums))

def read_mail():
    imap = imaplib.IMAP4_SSL("imap.gmail.com", 993)
    imap.login(user, pw)
    imap.list()
    imap.select("inbox")
    status, response = imap.search('INBOX', '(UNSEEN)')
    unread_msg_nums = response[0].split()
    result, data = imap.uid('search', None, "ALL") # search and return uids instead
    latest_email_uid = data[0].split()[-1]
    result, data = imap.uid('fetch', latest_email_uid, '(RFC822)')
    raw_email = data[0][1]


    email_message = email.message_from_string(raw_email)

    print email_message['To']

    print email.utils.parseaddr(email_message['From']) # for parsing "Yuji Tomita" <yuji@grovemade.com>

    email_items = email_message.items()
    # print all headers
    print email_items[1]
    print email_items[2]
    print email_items[5]
    print '\n'



    b = email.message_from_string(raw_email)
    if b.is_multipart():
        for payload in b.get_payload():
            # if payload.is_multipart(): ...
            print payload.get_payload()
        else:
            print b.get_payload()

def new_mail():
    from_add = user
    to_add = raw_input('Enter TO address:')
    msg = raw_input('Enter desired message:')


    server = smtplib.SMTP('smtp.gmail.com:587')
    server.starttls()
    server.login(user,pw)
    server.sendmail(from_add,to_add,msg)

def exit_mail():
    confirm_exit = raw_input('Are you sure you want to exit? (Yes/No):')
    server = smtplib.SMTP('smtp.gmail.com:587')
    if confirm_exit == 'Yes':
        server.quit()
        print 'Nice Nhu-ing you! Come again soon :)'
    elif confirm_exit == 'No':
        return prompt


def mail_options():
    prompt = raw_input('Say \'Nhu\' to compose a message \nOR \nSay \'Read\' to read unread message \nOR \nSay \'Escape\' to exit NhuMail: \n')

    while True:
        if prompt == 'Nhu':
            new_mail()
            return prompt

        elif prompt == 'Read':
            read_mail()
            return prompt

        elif prompt == 'Escape':
            exit_mail()
            break

        else:
            print 'You didn\'t enter one of the options!'
            return prompt


check_mail(user,pw)
mail_options()

Answer 1

您的计划中的问题在于mail_options()。您有一个无限循环，只能运行一次，然后由于使用return语句而每次都退出。进行无限循环以持续显示mail_options()，它应该可以解决您的问题。你只调用一次，这就是它退出的原因。

你可以这样做：

while True:
    mail_options()

另一种选择是询问循环内的提示，并消除return语句的功能。

def mail_options():
    while True:
        prompt = raw_input('Say \'Nhu\' to compose a message \nOR \nSay \'Read\' to read unread message \nOR \nSay \'Escape\' to exit NhuMail: \n')
        if prompt == 'Nhu':
            new_mail()

        elif prompt == 'Read':
            read_mail()

        elif prompt == 'Escape':
            exit_mail()
            return # Get out of the function.

        else:
            print 'You didn\'t enter one of the options!'

Answer 2

您似乎想继续致电mail_options()。你可以用无限循环来做到这一点：

while True:
    mail_options()

您也可以将循环放在mail_options()：

中

def mail_options():
    while True:
        prompt = raw_input('Say \'Nhu\' to compose a message \nOR \nSay \'Read\' to read unread message \nOR \nSay \'Escape\' to exit NhuMail: \n')
            while True:
                if prompt == 'Nhu':
                    new_mail()

                elif prompt == 'Read':
                    read_mail()

                elif prompt == 'Escape':
                    exit_mail()
                    break

                else:
                    print 'You didn\'t enter one of the options!'

Answer 3

尝试将mail_options（）更改为：

def mail_options():
    while True:
        prompt = raw_input('Say \'Nhu\' to compose a message \nOR \nSay \'Read\' to read unread message \nOR \nSay \'Escape\' to exit NhuMail: \n')
        if prompt == 'Nhu':
            new_mail()

        elif prompt == 'Read':
            read_mail()

        elif prompt == 'Escape':
            exit_mail()
            break

        else:
            print 'You didn\'t enter one of the options!'

您提示一次，然后在获得结果后立即返回他们在运行指定函数后所说的内容，然后因为您使用return关键字，它会突破循环和函数并退出该计划。

返回迷你电子邮件程序的“主菜单”

3 个答案: