code: def get_architecture(arch=None):
      
      if arch is None:
          arch = os.environ.get('PROCESSOR_ARCHITEW6432')
          if not arch:
              arch = os.environ.get('PROCESSOR_ARCHITECTURE')
      return SupportedArchitectureMap.get(arch, ArchDefinition('', ['']))
docs: Returns the definition for the specified architecture string.
  
      If no string is specified, the system default is returned (as defined
      by the PROCESSOR_ARCHITEW6432 or PROCESSOR_ARCHITECTURE environment
      variables).