Convert JSON to YAML

json2yaml.py

#!/usr/bin/env python3
#
# Accepts a JSON file path as an optional argument, otherwise reads stdin

import os
import simplejson
import sys
import yaml

# If valid path to json file is passed
if len(sys.argv) > 1 and os.path.exists(sys.argv[1]):
    f = open(sys.argv[1])
    data = f.read()
    f.close()

# Otherwise read from stdin
else:
    data = str(sys.stdin.read())

# Print YAML
print(yaml.dump(simplejson.loads(data), default_flow_style=False))