001-1. Constructing Python development environment
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# When installing, if you don't check on "Add Python 3.5 to PATH",
# you have to configure environment variable manually
# Environment variable makes Python excutable no matter where Python is installed
# Python 2 version exists only for compatibility,
# which won't be updated
# The time you should use Python 2 is when some Python functionalities you want to use
# can be compatible only with Python 2
# But those cases are rare except for some part of OpenCV which processes video
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# When Python 2 is registered in environment variable, you can use Python 3 by typing python3
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# PyCharm community version
# In PyCharm, creating project means creating folder and one simple setting file