Botocore: DeprecationWarning in botocore/parsers.py:434 with Python 3.7

[stig]

Hello! I'm using Sceptre with Python 3.7 on OS X and it uses boto3 and botocore internally. I am getting loads of these deprecation warnings:

/Users/stig/.virtualenvs/sceptre/lib/python3.7/site-packages/botocore/parsers.py:434: DeprecationWarning: This method will be removed in future versions. Use 'list(elem)' or iteration over elem instead.
if value.getchildren():

---

Version information:

$ python --version 
Python 3.7.0

>>> botocore.__version__
 '1.11.2' 

OS: macOS High Sierra (10.13.6)

$ sceptre --version
Sceptre, version 1.4.1

[joguSD]

Looks like these warnings are new in 3.7 but the referenced features have been documented as deprecated for a while, see: https://bugs.python.org/issue29209
It seems like the current plan is completely remove these deprecated xml features in 3.9+

Specifically, xml.etree.cElementTree has been deprecated since 3.3 and the getchildren function has been deprecated since 2.7/3.2.

[DiegoPomares]

https://github.com/boto/botocore/pull/1577

[kyleknap]

Thanks @DiegoPomares for the PR. I just merged it. You all should no longer be seeing that warning in the next release of botocore. Closing issue.