s3 = boto3.client('s3')
s3_bucket = 'bucket-name'

prefix = 'fo1/fo2/fo3'
for obj in s3.list_objects_v2(Bucket=s3_bucket, Prefix=prefix, Delimiter='/'):
     # Here when I print obj, it's a string with value as 'MaxKeys'

aws s3 cp foo.txt s3://my-bucket/fo1/fo2/fo3/foo.txt

aws s3 rm s3://my-buket/fo1/fo2/fo3/foo.txt