dcp_programmatic_upload.py

import boto3

# Get AWS credentials from your Optimizely Interface https://docs.developers.optimizely.com/web/docs/customer-profiles#bulk-upload
client = boto3.client(
    's3',
    aws_access_key_id = '',
    aws_secret_access_key = ''
)

# https://docs.aws.amazon.com/AmazonS3/latest/userguide/access-bucket-intro.html
# https://boto3.amazonaws.com/v1/documentation/api/latest/guide/s3-uploading-files.html

file_name = 'customer_data.csv' # Your customer data in current folder
bucket_name = 'optimizely-import'
# Get dcp_serviceId and datasourceId from Optimizely UI. Reach out to Optimizely support if you do not know where those exist.
s3_path = 'dcp/<dcp_serviceId>/<datasourceId>/customer_data.csv' 

client.upload_file(Filename=file_name, Bucket=bucket_name, Key=s3_path)