Python中将字符串转换为全部小写的最有效方法是删除所有非ascii字母字符？

text = "ConVert Me tO LoWErCasE"
lowercase_text = text.lower()
print(lowercase_text)  # 输出：convert me to lowercase

text = "ConVert Me tO LoWErCasE"
ascii_text = ''.join(c for c in text if c.isascii())
print(ascii_text)  # 输出：ConVertMetoLowerCasE

text = "ConVert Me tO LoWErCasE"
lowercase_ascii_text = ''.join(c.lower() for c in text if c.isascii())
print(lowercase_ascii_text)  # 输出：convert meto lowercase