参考mybufferedreader装饰类的定义,模拟定义一个带行号的缓冲区类,并测试验证。
时间: 2023-04-26 10:00:49 浏览: 80
好的,以下是带行号的缓冲区类的定义:
```python
class MyBufferedReader:
def __init__(self, file):
self.file = file
self.line_num = 0
self.buffer = ""
def readline(self):
if not self.buffer:
self.buffer = self.file.readline()
self.line_num += 1
if not self.buffer:
return ""
line, self.buffer = self.buffer, ""
return f"{self.line_num}: {line}"
```
这个类的作用是将文件对象包装成一个带行号的缓冲区对象,每次调用readline()方法时,会返回一行带行号的文本。
下面是一个测试示例:
```python
with open("test.txt", "w") as f:
f.write("hello\nworld\npython\n")
with open("test.txt") as f:
reader = MyBufferedReader(f)
print(reader.readline()) # 1: hello
print(reader.readline()) # 2: world
print(reader.readline()) # 3: python
print(reader.readline()) # 空字符串
```
这个示例中,我们先将一些文本写入到test.txt文件中,然后打开文件并创建一个MyBufferedReader对象,最后调用readline()方法读取每一行文本并打印出来。可以看到,每一行文本都带有行号。最后一次调用readline()方法返回一个空字符串,表示已经读取到文件末尾。
相关推荐
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![doc](https://img-home.csdnimg.cn/images/20210720083327.png)
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![pptx](https://img-home.csdnimg.cn/images/20210720083543.png)
![pptx](https://img-home.csdnimg.cn/images/20210720083543.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![pptx](https://img-home.csdnimg.cn/images/20210720083543.png)
![rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![pptx](https://img-home.csdnimg.cn/images/20210720083543.png)
![docx](https://img-home.csdnimg.cn/images/20210720083331.png)
![7z](https://img-home.csdnimg.cn/images/20210720083312.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![rar](https://img-home.csdnimg.cn/images/20210720083606.png)