Remove lxml

[thomasdorch]

Hi @joamatab,

The lxml module makes parsing xml simpler but it also requires a compiled C-extension, which is causing issues when migrating to 3.11. This PR removes lxml and replaces it with the built-in xml modules.

[sourcery-ai]

Sourcery Code Quality Report

✅  Merging this PR will increase code quality in the affected files by 0.98%.

Quality metrics	Before	After	Change
Complexity	7.43 ⭐	7.37 ⭐	-0.06 👍
Method Length	78.67 🙂	76.34 🙂	-2.33 👍
Working memory	9.41 🙂	9.16 🙂	-0.25 👍
Quality	62.08% 🙂	63.06% 🙂	0.98% 👍

Other metrics	Before	After	Change
Lines	622	630	8

Changed files	Quality Before	Quality After	Quality Change
gdsfactory/klayout_tech.py	62.08% 🙂	63.06% 🙂	0.98% 👍

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
gdsfactory/klayout_tech.py	KLayoutTechnology.export_technology_files	17 🙂	447 ⛔	18 ⛔	24.05% ⛔	Try splitting into smaller methods. Extract out complex expressions
gdsfactory/klayout_tech.py	LayerView._get_xml_element	16 🙂	142 😞	12 😞	45.28% 😞	Try splitting into smaller methods. Extract out complex expressions
gdsfactory/klayout_tech.py	LayerDisplayProperties.from_lyp	12 🙂	217 ⛔	9 🙂	47.75% 😞	Try splitting into smaller methods
gdsfactory/klayout_tech.py	LayerView.color_is_valid	10 🙂	130 😞	11 😞	53.56% 🙂	Try splitting into smaller methods. Extract out complex expressions
gdsfactory/klayout_tech.py	_properties_to_layerview	11 🙂	130 😞	10 😞	54.55% 🙂	Try splitting into smaller methods. Extract out complex expressions

Legend and Explanation

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• 🙂 good
• 😞 poor
• ⛔ very poor

The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

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[joamatab]

Thank you Thomas,

looking forward to trying gdsfactory on python3.11

[joamatab]

Just released v6.3.4 which should be python3.11 compatible

@SkandanC