如何使 lower() 方法适用于读取文件

Question

在 python 中，我正在读取一个文件，然后尝试将所有内容转换为小写，但它没有改变。我做错了什么？

fstor = open(txt)
story = fstor.read()
story.lower()

输出（我清理了标点符号和其他标记）

日子一天天过去，最聪明的小猪的房子已经建成了 砖头 他的兄弟们时不时地来看望他，笑着说 你为什么这么努力为什么不来玩但是 顽固的瓦工猪只说不 我将首先完成我的房子 它必须坚固耐用 然后我会

Answer 1

字符串在 python 中是不可变

fstor = open("file.txt")
story = fstor.read()
#story.lower() #strings are immutable in python
data = story.lower() #return a new string with lowercase
print(data)

输出：

the days went by and the wisest little pig's house took shape brick by brick from time to time his brothers visited him saying with a chuckle why are you working so hard why don't you come and play but the stubborn bricklayer pig just said no i shall finish my house first it must be solid and sturdy and then i'll

将数据写入另一个文件

with open("file.txt") as fstor:
    story = fstor.read()
    data = story.lower() #return a new string with lowercase

    with open('another_file.txt','w') as afile:
        afile.write(data)

Answer 2

with open('directory_path.txt', 'r') as f: 
    text = f.read() 
 
text = text.lower()
print(text)

这段代码有效:)