Python 无法写入引用 'FileNotFoundError' 的文件

Question

为什么下面的交互失败？ (Python 3.6.1)

>>> with open('an_image.png', 'rb') as f, open('~/Desktop/an_image.png', 'wb') as g:  
...     g.write(f.read())  
...  
Traceback (most recent call last):   File "<stdin>", line 1, in
<module> FileNotFoundError: [Errno 2] No such file or directory:
'~/Desktop/an_image.png'  
>>>

如果文件不存在，'w'模式不是应该创建它吗？

Answer 1

正如Dilettant所说，删除~。您可以手动指定绝对路径，或使用os.path.expanduser:

import os

desktop_img = os.path.expanduser('~/Desktop/an_image.png')
# desktop_img will now be /home/username/Desktop/an_image.png

with open('an_image.png', 'rb') as f, open(desktop_img, 'wb') as g:  
    g.write(f.read())