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pathlib equivalent for os.path.realpath() #71163

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pathlib equivalent for os.path.realpath()#71163
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stdlibStandard Library Python modules in the Lib/ directorytype-featureA feature request or enhancement

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@sorcio
sorcio
mannequin
opened on May 8, 2016
BPO 26976
Nosy @pitrou, @sorcio, @serhiy-storchaka
Superseder
  • bpo-19717: resolve() fails when the path doesn't exist
    		•

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

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    GitHub fields:

    assignee = None
closed_at = <Date 2016-05-08.12:37:54.782>
created_at = <Date 2016-05-08.11:15:48.078>
labels = ['type-feature', 'library']
title = 'pathlib equivalent for os.path.realpath()'
updated_at = <Date 2016-05-08.16:41:59.587>
user = 'https://github.com/sorcio'

    bugs.python.org fields:

    activity = <Date 2016-05-08.16:41:59.587>
actor = 'brett.cannon'
assignee = 'none'
closed = True
closed_date = <Date 2016-05-08.12:37:54.782>
closer = 'serhiy.storchaka'
components = ['Library (Lib)']
creation = <Date 2016-05-08.11:15:48.078>
creator = 'davide.rizzo'
dependencies = []
files = []
hgrepos = []
issue_num = 26976
keywords = []
message_count = 2.0
messages = ['265128', '265135']
nosy_count = 3.0
nosy_names = ['pitrou', 'davide.rizzo', 'serhiy.storchaka']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '19717'
type = 'enhancement'
url = 'https://bugs.python.org/issue26976'
versions = ['Python 3.6']

    Activity

    1. sorcio commented on May 8, 2016

      @sorcio
      sorciomannequin
      on May 8, 2016
      MannequinAuthor

      pathlib doesn't provide an exact replacement for os.path.realpath().

      Path.resolve() is the closest equivalent, but differs in behavior in one case: when the path does not exist.

      >>> os.path.realpath('/foo')
'/foo'

>>> Path('/foo').resolve()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/pathlib.py", line 1094, in resolve
    s = self._flavour.resolve(self)
  File "/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/pathlib.py", line 330, in resolve
    return _resolve(base, str(path)) or sep
  File "/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/pathlib.py", line 315, in _resolve
    target = accessor.readlink(newpath)
  File "/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/pathlib.py", line 422, in readlink
    return os.readlink(path)
FileNotFoundError: [Errno 2] No such file or directory: '/foo'

      This impairs pathlib usefulness to sanitize user input when I am about to create a file or a directory. The file does not exist yet, and pathlib doesn't provide an easy mean to validate whether the provided input is safe.

    2. sorcio
      added
      stdlibStandard Library Python modules in the Lib/ directory
      type-featureA feature request or enhancement
      on May 8, 2016

    3. serhiy-storchaka commented on May 8, 2016

      @serhiy-storchaka
      serhiy-storchaka
      on May 8, 2016
      Member

      This is a duplicate of bpo-19717.

    4. serhiy-storchaka
      closed this as completedon May 8, 2016
    5. ezio-melotti
      transferred this issue fromon Apr 10, 2022
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