+{% endcodeblock %}
+
+h2. Combine two or more collections
+
+Note, if two collections have files of the same name, the contents will be concatenated in the resulting manifest.
+
+{% codeblock as python %}
+import arvados
+import arvados.collection
+api = arvados.api()
+project_uuid = "zzzzz-tpzed-zzzzzzzzzzzzzzz"
+collection_uuids = ["zzzzz-4zz18-aaaaaaaaaaaaaaa", "zzzzz-4zz18-bbbbbbbbbbbbbbb"]
+combined_manifest = ""
+for u in collection_uuids:
+ c = api.collections().get(uuid=u).execute()
+ combined_manifest += c["manifest_text"]
+newcol = arvados.collection.Collection(combined_manifest)
+newcol.save_new(name="My combined collection", owner_uuid=project_uuid)
+{% endcodeblock %}
+
+h2. Upload a file into a new collection
+
+{% codeblock as python %}
+import arvados
+import arvados.collection
+
+project_uuid = "zzzzz-j7d0g-zzzzzzzzzzzzzzz"
+collection_name = "My collection"
+filename = "file1.txt"
+
+api = arvados.api()
+c = arvados.collection.Collection()
+with open(filename, "rb") as reader:
+ with c.open(filename, "wb") as writer:
+ content = reader.read(128*1024)
+ while content:
+ writer.write(content)
+ content = reader.read(128*1024)
+c.save_new(name=collection_name, owner_uuid=project_uuid)
+print("Saved %s to %s" % (collection_name, c.manifest_locator()))
+{% endcodeblock %}
+
+h2. Download a file from a collection
+
+{% codeblock as python %}
+import arvados
+import arvados.collection
+
+collection_uuid = "zzzzz-4zz18-zzzzzzzzzzzzzzz"
+filename = "file1.txt"
+
+api = arvados.api()
+c = arvados.collection.CollectionReader(collection_uuid)
+with c.open(filename, "rb") as reader:
+ with open(filename, "wb") as writer:
+ content = reader.read(128*1024)
+ while content:
+ writer.write(content)
+ content = reader.read(128*1024)
+print("Finished downloading %s" % filename)
+{% endcodeblock %}
+
+h2. Copy files from a collection to a new collection
+
+{% codeblock as python %}
+import arvados.collection
+
+source_collection = "zzzzz-4zz18-zzzzzzzzzzzzzzz"
+target_project = "zzzzz-j7d0g-zzzzzzzzzzzzzzz"
+target_name = "Files copied from source_collection"
+files_to_copy = ["folder1/sample1/sample1_R1.fastq",
+ "folder1/sample2/sample2_R1.fastq"]
+
+source = arvados.collection.CollectionReader(source_collection)
+target = arvados.collection.Collection()
+
+for f in files_to_copy:
+ target.copy(f, "", source_collection=source)
+
+target.save_new(name=target_name, owner_uuid=target_project)
+print("Created collection %s" % target.manifest_locator())
+{% endcodeblock %}
+
+h2. Copy files from a collection to another collection
+
+{% codeblock as python %}
+import arvados.collection
+
+source_collection = "zzzzz-4zz18-zzzzzzzzzzzzzzz"
+target_collection = "zzzzz-4zz18-aaaaaaaaaaaaaaa"
+files_to_copy = ["folder1/sample1/sample1_R1.fastq",
+ "folder1/sample2/sample2_R1.fastq"]
+
+source = arvados.collection.CollectionReader(source_collection)
+target = arvados.collection.Collection(target_collection)
+
+for f in files_to_copy:
+ target.copy(f, "", source_collection=source)
+
+target.save()
+{% endcodeblock %}
+
+h2. Delete a file from an existing collection
+
+{% codeblock as python %}
+import arvados
+
+c = arvados.collection.Collection("zzzzz-4zz18-zzzzzzzzzzzzzzz")
+c.remove("file2.txt")
+c.save()
+{% endcodeblock %}
+
+h2. Listing records with paging
+
+Use the @arvados.util.keyset_list_all@ helper method to iterate over all the records matching an optional filter. This method handles paging internally and returns results incrementally using a Python iterator. The first parameter of the method takes a @list@ method of an Arvados resource (@collections@, @container_requests@, etc).
+
+{% codeblock as python %}
+import arvados.util
+
+api = arvados.api()
+for c in arvados.util.keyset_list_all(api.collections().list, filters=[["name", "like", "%sample123%"]]):
+ print("got collection " + c["uuid"])
+{% endcodeblock %}