Creates a table of names with name type and line number. (example of tokenizer)
Older compilers, like COBOL, used to provide a xref table with the names defined in the program so developers could check on the name allocation.
Since the advent of more interpreted languages, practices changed, and I missed those tables.
With this little utility, I can now check that variables are conforming to some standard, and filter from the output those that do, so only the non-conforming ones will be reported. But that is left to you to develop!
For information on tokenize, https://docs.python.org/3/library/tokenize.html
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Input: a file name 
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Output, a table with the names defined in the program, and the line numbers where they were used. (stdout). 
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No help has been created 
Sample run: try against itself!!
python xref_var_table.py xref_var_table.py