def check_variable(name):
 if (len(name) > 31):
  return 'Variable names >31 characters may not function on some systems.'
 return check_identifier(name)

def check_variable ( name ) : if ( len ( name ) > 31 ) : return 'Variable names >31 characters may not function on some systems.' return check_identifier ( name )
return none if *name* is expected to be a valid variable name in any glsl version .