merge data into single one for an email : Python-CodePudding

I would like to merge data so I can send only one email

for body in result:
        msg = EmailMessage()
        msg.set_content(body)
        msg['From'] = email_address
        msg['To'] = recipient_address
        msg['Subject'] = subject_desc
        server = smtplib.SMTP('smtp.gmail.com', 587)
        server.ehlo()
        server.starttls()
        server.login("[email protected]", password)
        print("login success")
        server.send_message(msg)
        print("This message has been sent")
        server.quit()

This code actually sends me a dozen of single email with data I got from result as it's in a loop but I would like to get one single email for those dozen of data. I tried something like this :

def email(body):
    data = []
    for body in result:
        data.append(body)
    return data

but it's still sending dozen of email instead of one how could I do it ?

Thank you by advance :)

CodePudding user response：

If you have list with many strings then create one string

body = "\n".join(result)

and send without for-loop.

msg = EmailMessage()

body = "\n".join(result)
#body = "\n---\n".join(result) # to separate result with line `---`

msg.set_content(body)

msg['From'] = email_address
msg['To'] = recipient_address
msg['Subject'] = subject_desc

If you have list with filenames then you can use for-loop but with different indentation.

It is example for sending only images. For other type of files it would need different maintype,subtype

filenames = ['images/lenna.jpg', 'images/cats.jpg']

# ... 

msg = EmailMessage()

for name in filenames:
    msg.add_attachment(open(name, 'rb').read(), filename=name, maintype='text', subtype='jpg')

msg['From'] = email_address
msg['To'] = recipient_address
msg['Subject'] = subject_desc

Or you can use other module to guess type

import mimetypes

# ... code ...

for name in filenames:
    ctype, encoding = mimetypes.guess_type(name)
    print(name, ctype, encoding)
    maintype, subtype = ctype.split('/')
    msg.add_attachment(open(name, 'rb').read(), filename=name, maintype=maintype, subtype=subtype)

Of course you can also use set_content() and add_attachment() in the same mail.
It can be used to send HTML with images - but I skip this example.