Issue #21650: Add an `--sort-keys` option to json.tool CLI.

1 files changed, 10 insertions, 2 deletions

diff --git a/Lib/json/tool.py b/Lib/json/tool.py
index cd57e4f..4f3182c 100644
--- a/Lib/json/tool.py
+++ b/Lib/json/tool.py
@@ -11,6 +11,7 @@ Usage::
 
 """
 import argparse
+import collections
 import json
 import sys
 
@@ -24,17 +25,24 @@ def main():
                         help='a JSON file to be validated or pretty-printed')
     parser.add_argument('outfile', nargs='?', type=argparse.FileType('w'),
                         help='write the output of infile to outfile')
+    parser.add_argument('--sort-keys', action='store_true', default=False,
+                        help='sort the output of dictionaries alphabetically by key')
     options = parser.parse_args()
 
     infile = options.infile or sys.stdin
     outfile = options.outfile or sys.stdout
+    sort_keys = options.sort_keys
     with infile:
         try:
-            obj = json.load(infile)
+            if sort_keys:
+                obj = json.load(infile)
+            else:
+                obj = json.load(infile,
+                                object_pairs_hook=collections.OrderedDict)
         except ValueError as e:
             raise SystemExit(e)
     with outfile:
-        json.dump(obj, outfile, sort_keys=True, indent=4)
+        json.dump(obj, outfile, sort_keys=sort_keys, indent=4)
         outfile.write('\n')