Gmail Manager

# - *- coding: utf- 8 - *-
"""
Created on Mon Feb 20 15:36:55 2017

Name: MD. Khairul Basar
Phone: 01760446942
Email: khairul.basar93@gmail.com
"""

import time;
import email;
import imaplib;
import smtplib;
from email.mime.text import MIMEText;
from validate_email import validate_email;
from email.mime.multipart import MIMEMultipart;

def send_email(user_name,password):

    host = "smtp.gmail.com";
    port = 587;

    subject = "";
    message = "";
    recipients = [];

    print("To: ");
    recipients = input().split();
    print("Subject: ");
    subject = input();
    print("Message: ");
    while(True):
        line = input();
        if line:
            message+=line+"\n";
        else:
            break;

    if(len(recipients) == 0):
        print("No Recipient!\n");
        return;
    if(len(message) == 0):
        print("Message body is empty!\n");
        return;

    msg = MIMEMultipart();

    msg["Subject"] = subject;
    msg["From"] = user_name;
    msg["To"] = ",".join(recipients);
    body = MIMEText(message);
    msg.attach(body);

    message=msg.as_string();

    mail = smtplib.SMTP(host,port);
    mail.starttls();
    try:
        mail.login(user_name,password);
    except:
        print("Login Failed!\n");
        return;

    try:
        mail.sendmail(user_name,recipients,message);
        mail.quit();
        print("Your message has been sent!");
    except:
        print("Message sending failed!");
    return;

def check_email(user_name,password):

    encoding = "UTF-8";
    host = "imap.gmail.com";
    mail = imaplib.IMAP4_SSL(host);
    try:
        mail.login(user_name,password);
    except:
        print("Login Failed!\n");
        return;
    result,tree = mail.list();
    if(result != "OK"):
        print("Error! Try again!\n");
        return;

    mail.select("inbox");
    result,data=mail.uid("search",None,"Unseen");
    if(result != "OK"):
        print("Error! Try again!\n");
        return;

    data=str(data[0])[2:-1];
    id_list = data.split();

    tail = "email";
    if(len(id_list) > 1):
        tail+="s";
    print("You have %d new %s\n"%(len(id_list),tail));

    for ids in id_list:

        result,data = mail.uid("fetch",ids,"(RFC822)");
        raw_email=data[0][1];
        raw_email_string = raw_email.decode(encoding);
        email_msg = email.message_from_string(raw_email_string);

        print("From: ",email_msg["From"]);
        print("Subject: ",email_msg["Subject"]);

        for part in email_msg.walk():

            if(part.get_content_type() == "text/plain"):
                body = part.get_payload(decode=True);
                try:
                    body = body.decode(encoding);
                    print("Message:\n",body);
                    time.sleep(5);
                except:
                    print("Email can not be decoded!");
                    time.sleep(3);
        print("\n");

    mail.close();
    mail.logout();
    return;

def take_logins():

    user_name = "";
    password = "";

    while(True):
        user_name = input("Username: ");
        password = input("Password: ");
        if(validate_email(user_name)):
            break;
        else:
            print("Invalid Email!\n");
    return user_name,password;

def menu():

    print();
    print("1. Send Email");
    print("2. Check Email");
    print("3. Change Account");
    print("4. Quit");

    option = int(input());
    return option;

exit_code = 0;
user_name,password = take_logins();
while(exit_code == 0):

    option = menu();
    if(option == 1):
        send_email(user_name,password);
    if(option == 2):
        check_email(user_name,password);
    if(option == 3):
        user_name,password = take_logins();
    if(option == 4):
        exit_code = 1;
        print("Good Bye!");
        time.sleep(3);