major search and replace from python to python3

[arvados.git] / doc / _includes / _0_filter_py.liquid

diff --git a/doc/_includes/_0_filter_py.liquid b/doc/_includes/_0_filter_py.liquid
index 035c4818c9cf4e6eb7130500e9beec507a7da423..156f0c6c22402bc13476fd029a02a988049daffe 100644 (file)
--- a/doc/_includes/_0_filter_py.liquid
+++ b/doc/_includes/_0_filter_py.liquid
@@ -1,4 +1,9 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
+{% comment %}
+Copyright (C) The Arvados Authors. All rights reserved.
+
+SPDX-License-Identifier: CC-BY-SA-3.0
+{% endcomment %}
 
 # Import the Arvados sdk module
 import arvados
@@ -14,22 +19,17 @@ collection = arvados.CollectionReader(this_task_input)
 # Create an object to write a new collection as output
 out = arvados.CollectionWriter()
 
-# Set the name of output file within the collection
-out.set_current_file_name("0-filter.txt")
-
-# Get an iterator over the files listed in the collection
-all_files = collection.all_files()
-
-# Iterate over each file
-for input_file in all_files:
-    for ln in input_file.readlines():
-        if ln[0] == '0':
-            out.write(ln)
+# Create a new file in the output collection
+with out.open('0-filter.txt') as out_file:
+    # Iterate over every input file in the input collection
+    for input_file in collection.all_files():
+        # Output every line in the file that starts with '0'
+        out_file.writelines(line for line in input_file if line.startswith('0'))
 
-# Commit the output to keep.  This returns a Keep id.
-output_id = out.finish()
+# Commit the output to Keep.
+output_locator = out.finish()
 
-# Set the output for this task to the Keep id
-this_task.set_output(output_id)
+# Use the resulting locator as the output for this task.
+this_task.set_output(output_locator)
 
 # Done!