code: def get_version(self, dependency):
          
          logger.debug("getting installed version for %s", dependency)
          stdout = helpers.logged_exec([self.pip_exe, "show", str(dependency)])
          version = [line for line in stdout if line.startswith('Version:')]
          if len(version) == 1:
              version = version[0].strip().split()[1]
              logger.debug("Installed version of %s is: %s", dependency, version)
              return version
          else:
              logger.error('Fades is having problems getting the installed version. '
                           'Run with -v or check the logs for details')
              return ''
docs: Return the installed version parsing the output of 'pip show'.