Uploading a tempfile to Amazon S3.

temp_file_s3.py

import tempfile

import boto3

s3 = boto3.client('s3')

bucket_name = 'my-bucket'
file_key = 'myfile.txt'

temp_file = tempfile.TemporaryFile()
try:
    temp_file.write('File content here...')
    temp_file.seek(0)
    s3.upload_fileobj(temp_file, bucket_name, file_key)
finally:
    temp_file.close()

Tks, helped me a lot!