[Python] python send_message vs sendmail with attached MIMEText

I found lots of sample code showing how to use

sendmail(sender_email, receiver_emails, msg.as_string())

for a MIMEMultipart message containing an html body and attachments.

Then I read that an EmailMessage object would be even more convenient, as the send_message method is supposed to extract the from, to, cc, bcc directly from the EmailMessage headers.

This works fine for plain text messages, but if I do

msg.attach(MIMEText(body, 'html'))

instead of

msg.set_content(body) # displaying the html body as plain text

the final

server.send_message(msg)

fails with AttributeError: 'list' object has no attribute 'encode'

Do I have to add a header to the MIMEText part to supply 'utf-8' encoding to the MIMEtext part ?

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