Python test

Update development guide in README.md (#1213) #2591

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Run time

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Job	Run time
test-matrix (3.11, stable)	13m 35s
test-matrix (3.9, stable)	13m 19s
test-matrix (3.13, stable)	13m 29s
test-matrix (3.12, stable)	13m 27s
test-matrix (3.10, stable)	20m 13s
	1h 14m 3s