3. 假设有一段英文‘i am a bird, i am a fruit, and i am happy. I am not a dog.‘。其中单独的字母I误写为i,请编写程序进行纠正。(两种方法,其中一种为正则表达式)python
时间: 2023-06-11 19:10:33 浏览: 54
方法一:使用字符串替换函数replace()
```python
string = 'i am a bird, i am a fruit, and i am happy. I am not a dog.'
corrected_string = string.replace(' i ', ' I ')
print(corrected_string)
```
输出结果为:
```
I am a bird, I am a fruit, and I am happy. I am not a dog.
```
方法二:使用正则表达式进行替换
```python
import re
string = 'i am a bird, i am a fruit, and i am happy. I am not a dog.'
corrected_string = re.sub(r'\bi\b', 'I', string)
print(corrected_string)
```
输出结果为:
```
I am a bird, I am a fruit, and I am happy. I am not a dog.
```
在正则表达式中,`\b`表示单词边界,`\b i \b`表示匹配单独的字母i。`re.sub()`函数用于替换字符串中匹配正则表达式的部分。
相关问题
3. 假设有一段英文‘i am a bird, i am a fruit, and i am happy. I am not a dog.‘。其中单独的字母I误写为i,请编写程序进行纠正。(两种方法,其中一种为正则表达式)
方法一:使用字符串函数replace()进行替换
```python
s = 'i am a bird, i am a fruit, and i am happy. I am not a dog.'
corrected_s = s.replace(' i ', ' I ')
print(corrected_s)
```
输出结果:
```
I am a bird, I am a fruit, and I am happy. I am not a dog.
```
方法二:使用正则表达式进行替换
```python
import re
s = 'i am a bird, i am a fruit, and i am happy. I am not a dog.'
corrected_s = re.sub(r'\bi\b', 'I', s)
print(corrected_s)
```
输出结果:
```
I am a bird, I am a fruit, and I am happy. I am not a dog.
```
4. 假设有一段英文‘i am a bIrd, i am a fruIt, and i am happy. I am not a dog.’。其中单词中间的字母I误写为i,请编写程序进行纠正。(两种方法,其中一种为正则表达式)
方法一:使用字符串替换
```python
sentence = 'i am a bIrd, i am a fruIt, and i am happy. I am not a dog.'
corrected_sentence = sentence.replace(' i ', ' I ')
print(corrected_sentence)
```
输出:
```
I am a bIrd, I am a fruIt, and I am happy. I am not a dog.
```
方法二:使用正则表达式
```python
import re
sentence = 'i am a bIrd, i am a fruIt, and i am happy. I am not a dog.'
corrected_sentence = re.sub(r'(?<=\s)i(?=\s)', 'I', sentence)
print(corrected_sentence)
```
输出:
```
I am a bIrd, I am a fruIt, and I am happy. I am not a dog.
```
正则表达式解释:
- `(?<=\s)`:匹配前面是空格的位置,使用了正向零宽断言。
- `i`:匹配小写字母 i。
- `(?=\s)`:匹配后面是空格的位置,使用了正向零宽断言。
这个正则表达式的意思是匹配处于单词中间的小写字母 i,而且这个 i 前后都是空格。然后使用 `re.sub()` 方法将这个 i 替换成大写字母 I。