test: improve test coverage and fix negative exponents in power_using_recursion.py#12989

Rxbber-dxcky wants to merge 6 commits intoTheAlgorithms:masterTheAlgorithms/Python:masterfrom

Rxbber-dxcky:test/improve-test-coverageRxbber-dxcky/Python-TheAlgorithms:test/improve-test-coverageCopy head branch name to clipboard