code: def pypi_search(self):
          
          spec = self.pkg_spec
          #Add remainging cli arguments to options.pypi_search
          search_arg = self.options.pypi_search
          spec.insert(0, search_arg.strip())
  
          (spec, operator) = self.parse_search_spec(spec)
          if not spec:
              return 1
          for pkg in self.pypi.search(spec, operator):
              if pkg['summary']:
                  summary = pkg['summary'].encode('utf-8')
              else:
                  summary = ""
              print("""%s (%s):
          %s
      """ % (pkg['name'].encode('utf-8'), pkg["version"],
                      summary))
          return 0
docs: Search PyPI by metadata keyword
          e.g. yolk -S name=yolk AND license=GPL
  
          @param spec: Cheese Shop search spec
          @type spec: list of strings
  
          spec examples:
            ["name=yolk"]
            ["license=GPL"]
            ["name=yolk", "AND", "license=GPL"]
  
          @returns: 0 on success or 1 if mal-formed search spec