1.2.6. 输入和输出¶
To be exhaustive, here are some information about input and output in Python. 由于我们将使用Numpy方法读取和写入文件,你可以在第一次阅读时跳过本章。
我们从文件中写入或读取字符串(其他类型必须转换为字符串)。To write in a file:
>>> f = open('workfile', 'w') # opens the workfile file
>>> type(f)
<type 'file'>
>>> f.write('This is a test \nand another test')
>>> f.close()
To read from a file
In [1]: f = open('workfile', 'r')
In [2]: s = f.read()
In [3]: print(s)
This is a test
and another test
In [4]: f.close()
另见
For more details: https://docs.python.org/tutorial/inputoutput.html
1.2.6.1. 迭代文件¶
In [6]: f = open('workfile', 'r')
In [7]: for line in f:
...: print line
...:
This is a test
and another test
In [8]: f.close()
1.2.6.1.1. 文件的模式¶
- Read-only:
r
- Write-only:
w
- Note: Create a new file or overwrite existing file.
- Append a file:
a
- Read and Write:
r+
- Binary mode:
b
- Note: Use for binary files, especially on Windows.