How to move files in Google Cloud Storage from one bucket to another bucket by Python

Here's a function I use when moving blobs between directories within the same bucket or to a different bucket.

from google.cloud import storage
import os

os.environ["GOOGLE_APPLICATION_CREDENTIALS"]="path_to_your_creds.json"

def mv_blob(bucket_name, blob_name, new_bucket_name, new_blob_name):
"""
Function for moving files between directories or buckets. it will use GCP's copy 
function then delete the blob from the old location.

inputs
-----
bucket_name: name of bucket
blob_name: str, name of file 
    ex. 'data/some_location/file_name'
new_bucket_name: name of bucket (can be same as original if we're just moving around directories)
new_blob_name: str, name of file in new directory in target bucket 
    ex. 'data/destination/file_name'
"""
storage_client = storage.Client()
source_bucket = storage_client.get_bucket(bucket_name)
source_blob = source_bucket.blob(blob_name)
destination_bucket = storage_client.get_bucket(new_bucket_name)

# copy to new destination
new_blob = source_bucket.copy_blob(
    source_blob, destination_bucket, new_blob_name)
# delete in old destination
source_blob.delete()

print(f'File moved from {source_blob} to {new_blob_name}')

Using the google-api-python-client, there is an example on the storage.objects.copy page. After you copy, you can delete the source with storage.objects.delete.

destination_object_resource = {}
req = client.objects().copy(
        sourceBucket=bucket1,
        sourceObject=old_object,
        destinationBucket=bucket2,
        destinationObject=new_object,
        body=destination_object_resource)
resp = req.execute()
print json.dumps(resp, indent=2)

client.objects().delete(
        bucket=bucket1,
        object=old_object).execute()