old_contents: import sys
  import json
  
  
  release_tag = sys.argv[1]
  python_version = sys.argv[2]
  ci_os = sys.argv[3]
  
  platform_mapping = {
      "ubuntu-latest": "linux-64",
      "macOS-latest": "osx-64",
  }
  
  data = {
      "name": "openforcefield",
      "channel": "omnia",
      "python": python_version,
      "platform": platform_mapping[ci_os],
      "release": release_tag,
  }
  
  with open("new_cookiecutter.json", "w") as fp:
      json.dump(data, fp)
  
new_contents: import sys
  import json
  
  
  release_tag = sys.argv[1]
  python_version = sys.argv[2]
  ci_os = sys.argv[3]
  
  platform_mapping = {
      "ubuntu-latest": "linux-64",
      "macOS-latest": "osx-64",
  }
  
  data = {
      "name": "openforcefield",
      "channel": "omnia",
      "python": [python_version],
      "platform": [platform_mapping[ci_os]],
      "release": release_tag,
  }
  
  with open("new_cookiecutter.json", "w") as fp:
      json.dump(data, fp)
  
subject: Change platform and python fields to lists