code: def gen_yaml_category():
      '''
      find YAML.
      '''
      for wroot, _, wfiles in os.walk('./database/meta'):
          for wfile in wfiles:
              if wfile.endswith('.yaml'):
                  gen_category(os.path.join(wroot, wfile), wfile[0]f gen_yaml_category():
      '''
      find YAML.
      '''
      for wroot, _, wfiles in os.walk('./database/meta'):
          for wfile in wfiles:
              if wfile.endswith('.yaml'):
                  gen_category(os.path.join(wroot, wfile), wfile[0])
docs: find YAML.