Serhiy Storchaka added the comment:
Isn't it be clearer?
>>> import os
>>> dir_fd = os.open('somedir', os.O_RDONLY)
>>> def opener(path, flags):
... return os.open(path, flags, dir_fd=dir_fd)
...
>>> with open('spamspam.txt', 'w', opener=opener) as f:
... print('This will be written to somedir/spamspam.txt', file=f)
...
>>> os.close(dir_fd) # don't leak a file descriptor
Or if you want stronger example:
>>> import os, contextlib, functools
>>> @contextlib.contextmanager
... def open_relative(dirname):
... dir_fd = os.open(dirname, os.O_RDONLY)
... def opener(path, flags):
... return os.open(path, flags, dir_fd=dir_fd)
... try:
... yield functools.partial(open, opener=opener)
... finally:
... os.close(dir_fd)
...
>>> with open_relative('somedir') as open:
... with open('spamspam.txt', 'w') as f:
... print('This will be written to somedir/spamspam.txt', file=f)
...
Frankly speaking, all of these examples looks unconvincing to me. Even the
second example could be implemented without an "opener" argument.
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue13424>
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