Python Splitting数组字符串

我有一个 Python列表,如下所示：

["Hello,My Name is John","Good Afternoon,my name is David","I am three years old"]

我想将每个字符串拆分为逗号分隔列表并存储结果,并将每个单词转换为小写：

[['hello','my','name','is','john'],['good','afternoon','david'],['i','am','three','years','old']]

有任何建议如何做到这一点？
谢谢.

解决方法

试试以下代码：

x = ["Hello,"I am three years old"]

z = []

for i in x:
    # Replacing ",",converting to lower and then splitting
    z.append(i.replace("," ").lower().split())

print z

输出：

[['hello','old']]