code: def find(self, package, **kwargs):
          
          for finder in self.finders:
              package_spec = finder.find(package, **kwargs)
              if package_spec:
                  return package_spec
          return None
docs: Find a package using package finders.
  
          Return the first package found.
  
          Args:
              package (str): package to find.
              **kwargs (): additional keyword arguments used by finders.
  
          Returns:
              PackageSpec: if package found, else None