+ Fixed some spelling mistakes
+ Cleaned up tab/space indentation. Previously some of the samples would not
work if copied/pasted into a Python interpreter because of mixed tabs/spaces
+ Cleared all trailing whitespace
+ Missing quotation marks in some sample code caused mistakes with printing
messages
+ Added all import statements to some of the examples that already had some
import statements
Doubt if the name should be consistent to lowercase, same with that in Python.
Doubt if we just directly point out the installation package path as we did after introducing "$Path", but get rid of "$Path" introduction.
Doubt if the folder storing the code should be renamed as "packages".
Jarvis Schultz
HuanWeng