Download emails from GMail API and extract files from each email using Python and GYB

extract_attachments.py

import os
import sys
import email

for line in sys.stdin:
    fle = line.strip()
    if str.lower(fle[-3:]) == "eml":
        msg = email.message_from_file(open(fle))
        attachments = msg.get_payload()
        for attachment in attachments:
            try:
                fnam = attachment.get_filename()
                fnam = os.path.split(fle)[0] + '/' + fnam
                with open(fnam, 'wb') as f:
                    f.write(attachment.get_payload(decode=True,))
            except Exception as detail:
                pass

files_with_attachments.txt

GYB-GMail-Backup/2015/8/17/14f3c3e2c5ba5a4f.eml
GYB-GMail-Backup/2015/8/17/14f3b4c111382a0f.eml
GYB-GMail-Backup/2015/8/10/14f172d29a344670.eml
GYB-GMail-Backup/2015/8/10/14f1734143eb77f7.eml
GYB-GMail-Backup/2015/8/24/14f5f4adfaed419b.eml
GYB-GMail-Backup/2015/8/24/14f5f50237ef0b98.eml
GYB-GMail-Backup/2015/8/31/14f82f0ef337fce8.eml
GYB-GMail-Backup/2015/8/31/14f8405d01b9dd0a.eml
GYB-GMail-Backup/2015/8/3/14ef2dd2ad483fb8.eml
GYB-GMail-Backup/2015/8/3/14ef2e23459fe68d.eml
GYB-GMail-Backup/2015/4/6/14c8e7f8ac03a4c0.eml
GYB-GMail-Backup/2015/4/6/14c8e7e124fab2d3.eml

$ gyb --email youremail@gmail.com --search "from:someone@domain.com"
$ grep -l -R "Content-Type: application/octet-stream" GYB-GMail-Backup/ | tee files_with_attachments.txt