Develop Reference

Reading Gmail Email in Python

I am attempting to create a simple script to check my Gmail for emails with a certain title. When I run this program on Python 3.7.3 I receive this data: ('OK', [b'17']).
I need to access the body of the email within python. I am just not sure what to do with the data that I have.
Here is my current code:
import imaplib
import credentials
imap_ssl_host = 'imap.gmail.com'
imap_ssl_port = 993
username = credentials.email
password = credentials.passwd
server = imaplib.IMAP4_SSL(imap_ssl_host, imap_ssl_port)
server.login(username, password)
server.select('INBOX')
data = server.uid('search',None, '(SUBJECT "MY QUERY HERE!")')
print(data)
The result from running the code:
('OK', [b'17'])
I know it is a little rough, but I am still learning, so any advice you have to help me improve would be greatly appreciated!

You need to first list the contents of the selected mailbox and fetch one of the items. You could do something like this (also check the link suggested by #asynts)
imap.select('Inbox')
status, data = imap.search(None, 'ALL')
for num in data[0].split():
status, data = imap.fetch(num, '(RFC822)')
email_msg = data[0][1]
If you only want specific fields in the body, instead of parsing the RFC you could filter fields like:
status, data = imap.fetch(num, '(BODY[HEADER.FIELDS (SUBJECT DATE FROM TO)])')

Decoding message headers and bodies in python

I'm trying to program a simple mail client in Python which can both send and read messages from inbox in gmail. The sending part works well, but the reading part keeps giving me a bad result.
Here is the python code:
import imaplib
import base64
email_user = '<gmail_address>'
email_pass = '<password>'
M = imaplib.IMAP4_SSL('imap.gmail.com', 993)
M.login(email_user, email_pass)
M.select('inbox')
typ, message_numbers = M.search(None, 'ALL') # change variable name, and use new name in for loop
typ, data = M.fetch(b'1', '(RFC822)')
data1 = base64.b64decode(data[0][1])
print('Message \n%s' %data1)
M.close()
M.logout()
and the result is:
Message
b'\r\xe9b\xbd\xea\xdeu:1\xcaf\xa2\x97M;\x82f\xa2\x95\xca&E\xe7\x1e\x8a\xf7\x9do-\xb4\xd3f\xb5\xef\xdd\x1a\xd7Nt\xd3M4\xc2+aH\xc4\xcf\x89\xdc\xb5\xea\xfe\x9c\xb2\x9d\xb8\xd3\xae\xbd\xf2\x98\xdd2\x89\xf5\xd4W\x9b\xdbM}\xd3nv\xd7\x9d<\xd3C\xd2Mt^q\xe8\xafy\xd6\xf2\xdbM6i\xd7\xfc\xdbgp\x8a\xd8R13\xe2w\x8d\xa6\xaf^\xbb\xefo{\xf3\n\xdb\xeb}y\xe3\xdf<\xdb}\xf9\xdfM\x8c\xa2}u\x15\xe6\xf6\xd3_t\xdb\x9d\xb5\xe7O4\xd0\xf4\x93\x01\x10\x92y\xa9b\xd5\xaa\xecj\xc8Z\xdb\x9e\xad\xd7\x9e=\xf3\xcd\xb7\xdf\x97/\x9e\x89\xdev\n(\x82W\x9c\xa2k'
I appreciate any modified code and hint. Also I'm new to python so please keep your descriptions as simple as possible...

The message you receive in data[0][1] is not base64.
You want to do something like
from email import message_from_bytes
...
msg = message_from_bytes(data[0][1])
and then manipulate msg.

I'm trying to get emails from server using imaplib in Python, but it didn't print anything

I'm trying to get and print all emails from server using imaplib in Python, but it didn't print anything. I have gone through I want to grab all emails from an inbox using the Python IMAPLIB module... how can I do this? and the imaplib documentation. But the code didn't print the mails.
mail = imaplib.IMAP4_SSL(imap_host)
## login
mail.login(imap_user, imap_pass)
status, messages = mail.select('INBOX')
print(status)
if status != "OK":
exit("Incorrect mail box")
print(messages)
typ, data = mail.search(None, 'ALL')
for num in data[0].split():
typ, data = mail.fetch(num, '(RFC822)')
print('Message %s\n%s\n' % (num, data[0][1]))
mail.close()
mail.logout()
Here, the print(status) prints 'OK' but print(messages) prints [b'0']. Several answers from stackoverflow i have analyzed. I'm stuck in this, any suggestions. I want to print all the emails in the particular mailid.

python email.parser: extract header from email

import sys, imaplib
from email.parser import HeaderParser
mail = imaplib.IMAP4_SSL(SERVER, PORT)
status, data = mail.search(None, 'ALL')
for msg_id in data[0].split():
status, message = mail.fetch(msg_id, '(RFC822)')
print message[0][1]
mail.close()
mail.logout()
I am trying to fetch emails from gmail via imap. All works fine, except that I am not able to extract header (subject, sender, date) from the message. In the above code, message[0][1] contains my email.
The only way I am able to get the header is to ask the imap server again, specifically for header:
status, message = mail.fetch(msg_id, '(BODY[HEADER.FIELDS (SUBJECT FROM)])')
parser = HeaderParser()
header = parser.parsestr(message[0][1])
print header
could somebody please advise how to do it?

I assume you've got the full email, not only the message body.
raw_message = """From: Santa Claus <santa#aintreal.no>
To: Some Dude <some#du.de>
Subject: I have lost your presents.
Dude, i am so sorry.
"""
import email
msg = email.message_from_string(raw_message)
print(msg['Subject']) # "I have lost your presents."
msg is a email.message.Message object.

How to delete the biggest emails from my gmail using a python script?

My gmail is getting full... I need a method to find out the biggest email from the Inbox and delete it. However, in the web interface of gmail, what I can do is to find out the emails with attachments first, and then check the attachement size one by one.
The efficiency is too low!
I also find a python script which could log in my gmail account and retrieve emails, via imap protocol, but I didn't find a way to check the attachment size.
Could someone help me? Thanks in advance.

Imap library has search method. There is almost ready to use code for you.
#!/usr/bin/env python
import imaplib
from re import findall
MAXSIZE = 1000
MINSIZE = 1
m = imaplib.IMAP4_SSL('imap.gmail.com')
m.login('example#gmail.com','testPassword')
m.select()
typ, data = m.search(None, 'ALL')
typ, data = m.search(None,'(SMALLER %d) (LARGER %d)' % (MAXSIZE * 1000,MINSIZE * 1000))
for num in data[0].split():
typ, data = m.fetch(num, '(RFC822)')
print 'Message %s\n%s\n' % (num, len(data[0][1]))
m.close()
m.logout()