On 2014-07-09 23:50, Ethan Furman wrote:
On 07/09/2014 02:33 PM, Ben Hoyt wrote:
On a system which did not supply is_dir automatically I would write that as:
for entry in os.scandir(path):
if ignore_entry(entry.name):
continue
if os.path.isdir(entry.full_name):
# do something interesting
Not hard to read or understand, no time wasted in unnecessary lstat calls.
No, but how do you know whether you're on "a system which did not
supply is_dir automatically"? The above is not cross-platform, or at
least, not efficient cross-platform, which defeats the whole point of
scandir -- the above is no better than listdir().
Hit a directory with 100,000 entries and you'll change your mind. ;)
Okay, so the issue is you /want/ to write an efficient, cross-platform
routine...
hrmmm.....
thinking........
Okay, marry the two ideas together:
scandir(path, info=None, onerror=None)
"""
Return a generator that returns one directory entry at a time in a
DirEntry object
Should that be "that yields one directory entry at a time"?
info: None --> DirEntries will have whatever attributes the O/S
provides
'type' --> DirEntries will already have at least the file/dir
distinction
'stat' --> DirEntries will also already have stat information
"""
DirEntry.is_dir()
Return True if this is a directory-type entry; may call os.lstat if the
cache is empty.
DirEntry.is_file()
Return True if this is a file-type entry; may call os.lstat if the cache
is empty.
DirEntry.is_symlink()
Return True if this is a symbolic link; may call os.lstat if the cache
is empty.
DirEntry.stat
Return the stat info for this link; may call os.lstat if the cache is
empty.
Why is "is_dir", et al, functions, but "stat" not a function?
This way both paradigms are supported.
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