如何修改Python代码实现排除首尾h且保留内部h的字符串反转输出

现有代码 #

#This is my string known as "greeting".

greeting = "hello how are you, what?" 

#This prints the greeting the normal way.

print(greeting.title())

#This prints the greeting backwards and excluding the chosen letter "h" on the outside.  

print (greeting.title()[:greeting.find("h"):-1] + greeting[greeting.rfind("h")-1:5])

需求 #

输出问候字符串时排除首尾的字母"h"（保留内部的"h"），期望输出：

"Hello How Are You, What?"

"W ,uoY erA woH olle"

当前代码输出 #

"Hello How Are You, What?"

"?tahW ,uoY erA woH olle"

修正方案 #

原代码的切片逻辑错误，导致反转时包含了末尾的?tah部分。我们需要精准截取排除首尾"h"后的子串，再进行反转处理。

修正后的完整代码 #

# This is my string known as "greeting".
greeting = "hello how are you, what?" 

# This prints the greeting the normal way.
print(greeting.title())

# This prints the greeting backwards and excluding the chosen letter "h" on the outside.  
# 去掉开头的h，再移除最后一个h及之后的内容，转标题后反转
without_first_h = greeting[1:]
last_h_index = without_first_h.rfind('h')
target_str = without_first_h[:last_h_index]
print(target_str.title()[::-1])

修正逻辑说明 #

1. greeting[1:]：去掉原字符串开头的小写"h"，得到子串"ello how are you, what?"
2. without_first_h.rfind('h')：定位该子串中最后一个"h"的位置（即"what"里的"h"）
3. without_first_h[:last_h_index]：截取到该"h"之前的部分，得到"ello how are you, w"，从而排除了首尾的"h"
4. target_str.title()[::-1]：将子串转为标题格式后反转，得到期望的输出结果

内容的提问来源于stack exchange，提问作者James Leroy