code: def from_filename(cls, filename, sync_from_start=True):
          
          # Inline imports: the Pygments dependency is optional!
          from pygments.util import ClassNotFound
          from pygments.lexers import get_lexer_for_filename
  
          try:
              pygments_lexer = get_lexer_for_filename(filename)
          except ClassNotFound:
              return SimpleLexer()
          else:
              return cls(pygments_lexer.__class__, sync_from_start=sync_from_start)
docs: Create a `Lexer` from a filename.