fail on side effect
	modified:   tests/chap2/q0005.py
Merge branch 'upstream'
side effect sample.
	modified:   exercises/chap2/q0005.py
wrong length in unittests
	modified:   tests/chap3/q0005.py
Merge branch 'upstream'
sample answer for chap 3 quiz5
	modified:   exercises/chap3/q0005.py