code: def get_url_map():
      
      map = {}
      path = os.path.join(
          os.path.dirname(os.path.realpath(__file__)),  # current working dir ../
          "custom",  # ../custom/
          "pypi",  # ../custom/pypi/
          "map.txt"  # ../custom/pypi/map.txt
      )
      with open(path) as f:
          for line in f.readlines():
              package, url = line.strip().split(": ")
              map[package] = url
      return map
docs: Loads custom/pypi/map.txt and builds a dict where map[package_name] = url
      :return: dict, urls