new file:   erl/math_my.erl
	modified:   erl/sort.erl
	new file:   python/learn-threading/start_thread1.py
	new file:   python/moduleA.py
	new file:   python/moduleB.py
	new file:   python/test_all.py
Merge branch 'master' of https://github.com/bruceSz/learnToexcellent
	deleted:    erl/hanoi.beam
	deleted:    erl/perms.beam
	deleted:    erl/ring0.beam