How to use boto3 to upload file to Wasabi / S3 in Python

import boto3

# Create connection to Wasabi / S3
s3 = boto3.resource('s3',
    endpoint_url = 'https://s3.eu-central-1.wasabisys.com',
    aws_access_key_id = 'MY_ACCESS_KEY',
    aws_secret_access_key = 'MY_SECRET_KEY'
)

# Get bucket object
boto_test_bucket = s3.Bucket('boto-test')

# Create a test file we want to upload
with open("upload-test.txt", "w") as outfile:
    outfile.write("Hello S3!")
    
# Upload the file. "MyDirectory/test.txt" is the name of the object to create
boto_test_bucket.upload_file("upload-test.txt", "MyDirectory/test.txt")