Function checkPythonVersion

build-system/common/check-package-manager.js:204–249

* Checks if the local version of python is 2.7 or 3

()

 * Checks if the local version of python is 2.7 or 3
 */
function checkPythonVersion() {
  // Python 2.7 is EOL but still supported
  // Python 3.6+ are still supported
  // https://devguide.python.org/#status-of-python-branches
  const recommendedVersion = '2.7 or 3.6+';
  const recommendedVersionRegex = /^2\.7|^3\.(?:[6-9]|1\d)/;

  // Python2 prints its version to stderr (fixed in Python 3.4)
  // See: https://bugs.python.org/issue18338
  const pythonVersionResult = getStdout('python --version 2>&1').trim();
  const pythonVersion = pythonVersionResult.match(/Python (.*?)$/);
  if (pythonVersion && pythonVersion.length == 2) {
    const versionNumber = pythonVersion[1];
    if (recommendedVersionRegex.test(versionNumber)) {
      console.log(
        green('Detected'),
        cyan('python'),
        green('version'),
        cyan(versionNumber) + green('.')
      );
    } else {
      console.log(
        yellow('WARNING: Detected python version'),
        cyan(versionNumber) +
          yellow('. Recommended version for AMP development is'),
        cyan(recommendedVersion) + yellow('.')
      );
      console.log(
        yellow('⤷ To fix this, install a supported version from'),
        cyan('https://www.python.org/downloads/') + yellow('.')
      );
    }
  } else {
    console.log(
      yellow('WARNING: Could not determine the local version of python.')
    );
    console.log(
      yellow('⤷ To fix this, make sure'),
      cyan('python'),
      yellow('is in your'),
      cyan('PATH'),
      yellow('and is version'),
      cyan(recommendedVersion) + yellow('.')
    );
  }
}

/**
 * Runs checks for the package manager and tooling being used.