python - 如何将字符串中的单个字母变成大写

Question

我正在尝试获取输入文本文件并将每个“i”本身设为大写。到目前为止，这是我的代码，但它创建了一长行代码，而不是保留换行符和段落。

with open("greenEggsAndHam.txt", "r") as myfile:
    iText = myfile.read().split()

oText = ''

for word in iText:
    if(word == "i"):
        word = word.upper()
    oText = oText + word + " "
print oText

输出现在是这样的:

I am Sam Sam I am That Sam-i-am!That Sam-i-am! I do not like that Sam-i-am!

而不是这个:

I am Sam
Sam I am

That Sam-i-am!
That Sam-i-am!
I do not like that Sam-i-am!

有没有办法在保留段落和换行符的同时做到这一点？

Answer 1

当您将文本拆分为一个大的单个单词列表时，您的代码会失败，因此所有换行符都会被删除，这就是为什么您留下一大行文本。

您可以在迭代文件对象时分割每一行并检查 i:

with open("greenEggsAndHam.txt", "r") as myfile:
   for line in myfile:
       print(" ".join([w.upper() if w == "i" else w for w in line.split()]))

如果您想要一大段文字:

with open("greenEggsAndHam.txt", "r") as myfile:
   text = "\n".join([" ".join([ch.upper() if ch == "i" else ch for ch in line.split()]) for line in myfi