YAML to JSON File converter in python

yaml2json.py

# Converts input YAML file to JSON and writes the JSON to same filename but with ".json" ext.

import os, json, sys, yaml
if len(sys.argv) < 2:
    print("Usage: "+sys.argv[0]+" <input.yaml>")
    exit
try:
    yamlFname = sys.argv[1]
    pre, ext = os.path.splitext(yamlFname)
    jsonFname = pre + ".json"
    print("Converting "+yamlFname+" to "+jsonFname)
    with open(yamlFname, 'r') as yamlStream:
        data = yaml.safe_load(yamlStream)
        jsonData = json.dumps(data, indent=3, sort_keys=True)
        print(jsonData)
        jsonStream = open(jsonFname,"w+")
        jsonStream.write(jsonData);
        jsonStream.close()
except yaml.YAMLError as exc:
    print ("Error while parsing YAML file:")
    if hasattr(exc, 'problem_mark'):
        if exc.context != None:
            print ('  parser says\n' + str(exc.problem_mark) + '\n  ' +
                str(exc.problem) + ' ' + str(exc.context) +
                '\nCorrect YAML and retry.')
        else:
            print ('  parser says\n' + str(exc.problem_mark) + '\n  ' +
                str(exc.problem) + '\nCorrect YAML and retry.')
    else:
        print ("Something went wrong while parsing yaml file. Sorry it didn't work out.")
    exit
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