Update practicepython/exc01.py, practicepython/exc02.py,...
Update practicepython/exc01.py, practicepython/exc02.py, practicepython/exc03.py, practicepython/exc04.py
Update practicepython/exc01.py, practicepython/exc02.py, practicepython/exc03.py, practicepython/exc04.py