用Python语言读取文本数据
时间: 2024-09-28 14:10:19 浏览: 48
在Python中,读取文本数据非常简单,通常我们会使用内置的文件操作功能以及`open()`函数。以下是一些基本步骤:
1. 打开文件:使用`open()`函数打开一个文本文件,指定文件名(包括路径),模式通常是'r'表示读取模式。
```python
file = open('filename.txt', 'r')
```
2. 读取内容:可以逐行读取文件内容,或者一次性读取全部内容到字符串中,例如使用`read()`或`readlines()`方法。
- 逐行读取:
```python
for line in file:
print(line)
```
- 一次性读取:
```python
content = file.read()
```
3. 关闭文件:使用`close()`方法关闭文件,释放系统资源。
```python
file.close() # 这是推荐的做法,尽管Python会在某些时候自动关闭文件,但在实际编程中最好养成良好习惯
```
如果你使用的是Python 3,你可以直接使用上下文管理协议(with statement),这样无需手动关闭文件:
```python
with open('filename.txt', 'r') as file:
content = file.read()
```
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