Question

我有一个字符串，我想在每次第二次出现后替换the。

s = "change the string in the sentence and the save"

我希望将the替换为hello。但除了第一个。

输出应为：

change the string in hello sentence and hello save

Answer 1

我会将右边的字符串与您要替换使用str.rsplit()函数的单词分开，但只会分割s.count('the') - 1次。

然后，将输出列表与hello：

连接起来

>>> s.rsplit('the', s.count('the') - 1)
['change the string in ', ' sentence and ', ' save']

>>> 'hello'.join(s.rsplit('the', s.count('the') - 1))
'change the string in hello sentence and hello save'

Answer 2

试试这个：

def replace_not_first(str, word, replace):
    str_arr = str.split(word)
    return str_arr[0] + word + replace.join(str_arr[1:])

str = "change the string in the sentence and the save"
print(replace_not_first(str, 'the', 'hello'))

打印：change the string in hello sentence and hello save

Answer 3

这应该有效

string = "change the string in the sentence and the save"
the_arr = string.split("the")
print the_arr[0] + "the" + "hello".join(the_arr[1:])`

Answer 4

尝试以下一种衬垫解决方案。

string = 'change the string in the sentence and the save'
new_string = string[:string.find('the')+3] + string[string.find('the')+3:].replace('the', 'hello')

Answer 5

我希望这能做到这一点。

str = str.partition('the')[0] + str.partition('the')[1] + str.partition('the')[-1].replace('the','hello')

Answer 6

>>> str = "change the string in the sentence and the save"
>>> str.replace('the', 'hello')
>>> str.replace('hello', 'the',1)

Answer 7

试试这个：

>>> s = "change the string in the sentence and the save"
>>> s.split("the",1)[0]+"the" + s.split("the",1)[1].replace("the","hello")
'change the string in hello sentence and hello save'

Answer 8

您可以将字符串拆分为多个部分：

string = "change the string in the sentence and the save"

splitString = string.split()
firstIndex = splitString.index('the')

part1 = ' '.join(splitString[:firstIndex+1])
part2 = ' '.join(splitString[firstIndex+1:]).replace('the','hello')

newString = part1 + ' ' + part2

或者在一行中：

newString = ' '.join(['hello' if j == 'the' and i != string.split().index('the') else j for i, j in enumerate(string.split())])

字符串替换而不替换第一个实例

8 个答案: