upload.py

from boto3 import Session
import string
import random

ACCESS_KEY = "your access key"
SECRET_KEY = "your_secret_key"
REGION_NAME = "your bucket's region name"
BUCKET_NAME = "your bucket name"

ses = Session(aws_access_key_id=ACCESS_KEY,
              aws_secret_access_key=SECRET_KEY,
              region_name=REGION_NAME)

key = ''.join(random.choice(string.ascii_uppercase + string.ascii_lowercase + string.digits) for _ in range(10))
file = 'test.pdf'
content_type = 'application/pdf'
s3 = ses.resource('s3')

s3.Bucket(BUCKET_NAME).put_object(Key=key, Body=open(file, 'rb'),  ACL='public-read', ContentType=content_type)