[issue21127] Path objects cannot be constructed from str subclasses
Roundup Robot added the comment: New changeset c24cbd9bd63b by Antoine Pitrou in branch '3.4': Issue #21127: Path objects can now be instantiated from str subclass instances (such as numpy.str_). http://hg.python.org/cpython/rev/c24cbd9bd63b New changeset aad6d6b819ed by Antoine Pitrou in branch 'default': Issue #21127: Path objects can now be instantiated from str subclass instances (such as numpy.str_). http://hg.python.org/cpython/rev/aad6d6b819ed -- nosy: +python-dev ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue21127 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue21127] Path objects cannot be constructed from str subclasses
Antoine Pitrou added the comment: Ok, I've committed a patch (to 3.4 and 3.5) that force-casts to str. Thank you for reporting this bug! -- resolution: - fixed stage: - resolved status: open - closed type: - behavior versions: +Python 3.4 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue21127 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue21127] Path objects cannot be constructed from str subclasses
Antony Lee added the comment: I am loading some structure from a MATLAB binary file using scipy.io.loadmat. This structure contains (in particular) paths (written as bytestrings) to other files which end up being loaded as numpy.str_ objects. In fact, just trying to store and retrieve strings from numpy arrays wraps them in numpy.str_: import numpy type(numpy.array([foo])[0]) class 'numpy.str_' ... and now trying to construct a Path from that will crash. I agree, though, that force-casting str subclasses in the constructor may avoid other issues. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue21127 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue21127] Path objects cannot be constructed from str subclasses
Antoine Pitrou added the comment: I'm curious: what is the use case for str subclasses in Path objects? If this is to be supported, I think I'd rather force-cast to str rather than accept arbitrary subclasses. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue21127 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue21127] Path objects cannot be constructed from str subclasses
Antony Lee added the comment: The attached patch should fix the issue. -- keywords: +patch Added file: http://bugs.python.org/file34759/pathlib.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue21127 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue21127] Path objects cannot be constructed from str subclasses
New submission from Antony Lee: Trying to construct a Path object from a str subclass, e.g. class S(str): pass Path(S(foo)) fails because the subclass cannot be interned. I think that the interning should simply be removed for non-exactly-str arguments (it is only here for performance reasons, right?), or at least the error should be more explicit (note, in particular, that there is no error if one tries 'Path(S(foo/bar))' instead, which only confuses the matter more). In practice, I found out this via numpy, which provides its own str subclass, numpy.str_. -- components: Library (Lib) messages: 215342 nosy: Antony.Lee priority: normal severity: normal status: open title: Path objects cannot be constructed from str subclasses versions: Python 3.5 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue21127 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue21127] Path objects cannot be constructed from str subclasses
Changes by Ned Deily n...@acm.org: -- nosy: +pitrou ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue21127 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
