code: def build(self, dest=None):
          "Build out results to dest directory (creating if needed)"
          # dest can be set here or on init
          if not dest:
              dest = self.dest
  
          # raise an error if dest is None
          if dest is None:
              raise ValueError('destination directory must not be None')
  
          # store build dir for later
          self.dest = dest
  
          # ensure a build dir
          if not os.path.isdir(self.dest):
              os.makedirs(self.dest)
  
          # make sure we have files
          if not self.files:
              self.run()
  
          # write the content of each post to dest, using keys as filenames
          for filename, post in self.files.items():
  
              # join filename to dest dir
              path = os.path.join(self.dest, filename)
              with open(path, 'wb') as f:
                  f.write(post.content.encode('utf-8')f build(self, dest=None):
          "Build out results to dest directory (creating if needed)"
          # dest can be set here or on init
          if not dest:
              dest = self.dest
  
          # raise an error if dest is None
          if dest is None:
              raise ValueError('destination directory must not be None')
  
          # store build dir for later
          self.dest = dest
  
          # ensure a build dir
          if not os.path.isdir(self.dest):
              os.makedirs(self.dest)
  
          # make sure we have files
          if not self.files:
              self.run()
  
          # write the content of each post to dest, using keys as filenames
          for filename, post in self.files.items():
  
              # join filename to dest dir
              path = os.path.join(self.dest, filename)
              with open(path, 'wb') as f:
                  f.write(post.content.encode('utf-8'))
docs: Build out results to dest directory (creating if needed)