code: def format_requirement(ireq):
      
  
      if ireq.editable:
          line = "-e {}".format(ireq.link)
      else:
          line = _requirement_to_str_lowercase_name(ireq.req)
  
      if str(ireq.req.marker) != str(ireq.markers):
          if not ireq.req.marker:
              line = "{}; {}".format(line, ireq.markers)
          else:
              name, markers = line.split(";", 1)
              markers = markers.strip()
              line = "{}; ({}) and ({})".format(name, markers, ireq.markers)
  
      return line
docs: Generic formatter for pretty printing InstallRequirements to the terminal
      in a less verbose way than using its `__str__` method.