[New-bugs-announce] [issue39495] xml.etree.ElementTree.TreeBuilder.start differs between pure Python and C implementations
Shantanu
report at bugs.python.org
Wed Jan 29 21:11:47 EST 2020
New submission from Shantanu <hauntsaninja at gmail.com>:
The C accelerated version of `xml.etree.ElementTree.TreeBuilder.start` has a default value for `attrs`, whereas the pure Python version does not.
```
In [41]: sys.version
Out[41]: '3.8.1 (default, Jan 23 2020, 23:36:06) \n[Clang 11.0.0 (clang-1100.0.33.17)]'
In [42]: import xml.etree.ElementTree
In [43]: inspect.signature(xml.etree.ElementTree.TreeBuilder.start)
Out[43]: <Signature (self, tag, attrs=None, /)>
In [44]: from test.support import import_fresh_module
In [45]: pyElementTree = import_fresh_module('xml.etree.ElementTree', blocked=['_elementtree'])
In [46]: inspect.signature(pyElementTree.TreeBuilder.start)
Out[46]: <Signature (self, tag, attrs)>
```
>From PEP 399 (https://www.python.org/dev/peps/pep-0399/)
```
Acting as a drop-in replacement also dictates that no public API be provided in accelerated code that does not exist in the pure Python code. Without this requirement people could accidentally come to rely on a detail in the accelerated code which is not made available to other VMs that use the pure Python implementation.
```
----------
components: Library (Lib)
messages: 361002
nosy: hauntsaninja
priority: normal
severity: normal
status: open
title: xml.etree.ElementTree.TreeBuilder.start differs between pure Python and C implementations
_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39495>
_______________________________________
More information about the New-bugs-announce
mailing list