def show_to_programming_language(promo, programming_language):
 if promo.programming_language:
  return (programming_language == promo.programming_language)
 return True

def show_to_programming_language ( promo , programming_language ) : if promo . programming_language : return ( programming_language == promo . programming_language ) return True
filter a promo by a specific programming language return true if we havent set a specific language .