How can I get the subject of an email gmail python API - python-3.x

Question

def getbodyinbox():
service = build('gmail', 'v1', credentials=creds)
label_name = "READ-BY-SCRIPT"
label_id = 'Label_8507504117657095973'
results = service.users().messages().list(
userId='me', q="-label:"+label_name, maxResults=1).execute()
messages = results.get('messages', [])
body = []
if not messages:
body = "no messages"
return body
else:
for message in messages:
msg = service.users().messages().get(
userId='me', id=message['id']).execute()
labels = msg['labelIds']
if "INBOX" in labels:
headers = msg['payload']['headers']
headers = str(headers)
print(headers)
if "class_ix" in headers:
body.append(msg['payload']['parts'])
if 'data' in body[0][0]['body']:
body = base64.urlsafe_b64decode(
body[0][0]['body']['data'])
elif 'data' in body[0][1]['body']:
body = base64.urlsafe_b64decode(
body[0][1]['body']['data'])
body = str(body)
return body
print(getbodyinbox())
This is my code so far with the part that gets the credentials and all of the imports removed. It gets the body of the most recent email without a label 'READ-BY-SCRIPT' that also has the label INBOX. How can I get the subject of the email instead of the body?

Answer 1

Have a look at the message resource, MessagePart and header
The structure is the following:
"payload": {
"partId": string,
"mimeType": string,
"filename": string,
"headers": [
{
"name": string,
"value": string
}
],
and:
So, in other words, the subject is contained in the headers.
You can retrieve in Python with
headers = msg['payload']['headers']
subject= [i['value'] for i in headers if i["name"]=="Subject"]