code: def _env(self, lines):
          '''env will parse a list of environment lines and simply remove any
             blank lines, or those with export. Dockerfiles don't usually
             have exports.
   
             Parameters
             ==========
             lines: A list of environment pair lines.
  
          '''
          environ = [x for x in lines if not x.startswith('export')]        
          self.environ += envirof _env(self, lines):
          '''env will parse a list of environment lines and simply remove any
             blank lines, or those with export. Dockerfiles don't usually
             have exports.
   
             Parameters
             ==========
             lines: A list of environment pair lines.
  
          '''
          environ = [x for x in lines if not x.startswith('export')]        
          self.environ += environ
docs: env will parse a list of environment lines and simply remove any
             blank lines, or those with export. Dockerfiles don't usually
             have exports.
   
             Parameters
             ==========
             lines: A list of environment pair lines.