Python无法写入文件引用＆＃39; FileNotFoundError＆＃39;

Question

为什么以下互动失败？ （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'  
>>>

不是＆＃39; w＆＃39;模式应该创建文件，如果它不存在？

Answer 1

正如Dilettant所说，删除~。您可以手动指定绝对路径，也可以使用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())