在 Python 2.7 中，如何仅在'th'不可见时才将't'替换为 'top'并用 'hop' 'h'

Question

我是新来的，也是python，但我想试一试!我想把一个句子中的"t"换成"top"，"h"换成"hop"，只有当"th"不可见时，因为"th"会变成"thop"。例如:"Thi hi tea"必须变成"thopi hopi topea"。我有这样的代码:

sentence = str(raw_input('give me a sentence '))
start = 0
out = ''
while True:
    i = string.find( sentence, 'th', start )
    if i == -1:
        sentence = sentence.replace('t', 'top')
        sentence = sentence.replace('h', 'hop')
        break
    out = out + sentence[start:i] + 'thop'
    start = i+2

但不工作…什么好主意吗?

Answer 1

import re
str = 'Thi hi tea'
re.sub(r'(?i)h|t(?!h)', r'g<0>op', str)

收益率

'Thopi hopi topea'

• import re导入正则表达式库，我们从中使用替换sub，函数
• (?i)使正则表达式不区分大小写
• t(?!h)匹配不后跟'h'的't'
• g<0>op是一个替换字符串，用来替换原文本后面跟着"op"。

Answer 2

函数如下:

>>>input : 'Thi hi tea'
>>>def function(string):
       string = string.lower()
       string = string.replace('t','top')   #replace all the 't' with 'top' from the string
       string = string.replace('h','hop')   # replace all the 'h' with 'hop'
       string =  string.replace('tophop','thop')   #where t and h will be together there i will get 'tophop', so i am replacing 'tophop' with 'thop'
       return string.capitalize() #for capitalize the first letter

回答 :----------

>>>function('Thi hi tea')
'Thopi hopi topea'
>>>function('Hi,who is there?')
'Hopi,whopo is thopere?'

谢谢