samples: replace deprecated method (#1211)

* samples: replace deprecated method

* update print statement, decode

Author: cojenco

samples/snippets/snippets_test.py

@@ -361,7 +361,7 @@ def test_generate_upload_signed_url_v4(test_bucket, capsys):
 
     bucket = storage.Client().bucket(test_bucket.name)
     blob = bucket.blob(blob_name)
-    assert blob.download_as_string() == content
+    assert blob.download_as_bytes() == content
 
 
 def test_generate_signed_policy_v4(test_bucket, capsys):
@@ -592,7 +592,7 @@ def test_storage_compose_file(test_bucket):
             source_files[1],
             dest_file.name,
         )
-        composed = destination.download_as_string()
+        composed = destination.download_as_bytes()
 
         assert composed.decode("utf-8") == source_files[0] + source_files[1]
 

samples/snippets/storage_download_into_memory.py

@@ -37,11 +37,11 @@ def download_blob_into_memory(bucket_name, blob_name):
     # any content from Google Cloud Storage. As we don't need additional data,
     # using `Bucket.blob` is preferred here.
     blob = bucket.blob(blob_name)
-    contents = blob.download_as_string()
+    contents = blob.download_as_bytes()
 
     print(
-        "Downloaded storage object {} from bucket {} as the following string: {}.".format(
-            blob_name, bucket_name, contents
+        "Downloaded storage object {} from bucket {} as the following bytes object: {}.".format(
+            blob_name, bucket_name, contents.decode("utf-8")
         )
     )