parameters: (self)
docstring: Replace zero-lengh string in `namespaces`.
  
          This method will replce '' with None to align to `lxml`
          requirement that empty string prefixes are not allowed.
docstring_summary: Replace zero-lengh string in `namespaces`.
docstring_tokens: Replace zero - lengh string in namespaces .
function: def convert_empty_str_key(self) -> None:
          """
          Replace zero-lengh string in `namespaces`.
  
          This method will replce '' with None to align to `lxml`
          requirement that empty string prefixes are not allowed.
          """
  
          if self.namespaces and "" in self.namespaces.keys():
              self.namespaces[None] = self.namespaces.pop("", "default")
function_tokens: def convert_empty_str_key ( self ) -> None : if self . namespaces and "" in self . namespaces . keys ( ) : self . namespaces [ None ] = self . namespaces . pop ( "" , "default" )