os.stat on windows doesn't take an open file even though os.stat in os.supports_fd

[snoopyjc]

BPO	47198
Nosy	@eryksun, @snoopyjc

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

Show more details

GitHub fields:

assignee = None
closed_at = <Date 2022-04-02.04:31:08.895>
created_at = <Date 2022-04-02.03:51:52.564>
labels = ['type-bug', 'invalid', '3.10']
title = "os.stat on windows doesn't take an open file even though os.stat in os.supports_fd"
updated_at = <Date 2022-04-02.04:31:08.892>
user = 'https://github.com/snoopyjc'

bugs.python.org fields:

activity = <Date 2022-04-02.04:31:08.892>
actor = 'eryksun'
assignee = 'none'
closed = True
closed_date = <Date 2022-04-02.04:31:08.895>
closer = 'eryksun'
components = []
creation = <Date 2022-04-02.03:51:52.564>
creator = 'snoopyjc'
dependencies = []
files = []
hgrepos = []
issue_num = 47198
keywords = []
message_count = 2.0
messages = ['416535', '416536']
nosy_count = 2.0
nosy_names = ['eryksun', 'snoopyjc']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue47198'
versions = ['Python 3.10']

[snoopyjc]

os.stat on windows doesn't take an open file even though os.stat in os.supports_fd

>>> fd = open('tmp.tmp', 'w')
>>> fd
<_io.TextIOWrapper name='tmp.tmp' mode='w' encoding='cp1252'>
>>> os.stat(fd)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: stat: path should be string, bytes, os.PathLike or integer, not TextIOWrapper
>>> os.stat in os.supports_fd
True

[eryksun]

You're mistaken about what fd is. It's a TextIOWrapper, which wraps a BufferedWriter, which buffers a FileIO raw file object, which accesses the open file number fd.fileno(). For example:

    >>> f = open('tmp.tmp','w')
    >>> os.stat(f.fileno()).st_size
    0