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Add functions to generate a similar key #271

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Job	Run time
CI on x86_64 (python-38)	38s
CI on x86_64 (python-39)	39s
CI on x86_64 (python-310)	41s
CI on x86_64 (python-311)	1m 21s
CI on x86_64 (doc)	59s
CI on x86_64 (doctest)	35s
CI on x86_64 (sphinx)	1m 19s
CI on x86_64 (lint)	1m 17s
CI on x86_64 (pep8)	23s
CI on x86_64 (codespell)	26s
	8m 18s