New submission from Simeon Warner:
Seems that in python3 the XML encoding declaration from xml.etree.ElementTree
has changed from 2.x in that it is now lowercased, e.g. 'utf-8'. While the XML
spec [1] says that decoders _SHOULD_ understand this, the encoding string
_SHOULD_ be 'UTF-8'. It seems that keeping to the standard in the vein of being
strictly conformant in encoding, lax in decoding will give maximum
compatibility.
It also seems like an unhelpful change for 2.x to 3.x migration though that is
perhaps a minor issue (but how I noticed it).
Can show with:
>cat a.py
from xml.etree.ElementTree import ElementTree, Element
import os, sys
print(sys.version_info)
if sys.version_info > (3, 0):
fp = os.fdopen(sys.stdout.fileno(), 'wb')
else:
fp = sys.stdout
root = Element('hello',{'beer':'good'})
ElementTree(root).write(fp, encoding='UTF-8', xml_declaration=True)
fp.write(b"\n")
>python a.py
sys.version_info(major=2, minor=7, micro=5, releaselevel='final', serial=0)
<?xml version='1.0' encoding='UTF-8'?>
<hello beer="good" />
>python3 a.py
sys.version_info(major=3, minor=4, micro=2, releaselevel='final', serial=0)
<?xml version='1.0' encoding='utf-8'?>
<hello beer="good" />
Cheers,
Simeon
[1] <http://www.w3.org/TR/2006/REC-xml11-20060816/#NT-EncName> "In an encoding
declaration, the values "UTF-8", "UTF-16", ... should be used for the various
encodings and transformations of Unicode" and then later "XML processors should
match character encoding names in a case-insensitive way".
----------
components: XML
messages: 250328
nosy: zimeon
priority: normal
severity: normal
status: open
title: xml.etree.ElementTree encoding declaration should be capital ('UTF-8')
rather than lowercase ('utf-8')
type: behavior
versions: Python 3.4
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue25047>
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