Python Boto3 update/overwrite object in S3 bucket

From the docs : https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/s3.html#S3.Client.put_object

If you want to overwrite the object you just upload the file with the same name and if that name already exists it'll be done automatically.

Extra note: If you want to keep all historic versions of the object enable versioning on the bucket.

As mentioned in the other answer if you push the file with the same name it will overwrite it, just for completeness here is an actual implementation using boto3

import boto3 

s3 = boto3.resource(‘s3’)

try:
  s3.upload_file(file_path, bucket, key)
except ClientError as e:
  print("Error")