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show("aa",1)  Description
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    #by: D@CC
    #date:    2021FJun26
    #updated: 2022BFeb23
    #
    #  NB beware: the variable name must be in quotes
    #
    # This is a python debugging aide.
    # Often, when debugging, it is very helpful to list the type
    # and value of variables at various stages of execution.
    # Even listing a comment string at crucial points is of help
    # This routine is designed to be turned on/off near the beginning
    # of the program.  If arg2 is 0, no variables will be shown
    # unless an error condition exists (e.g. a variable is not defined).
    # if arg2 is 0, the program will not print any extraneous output.
    # If arg2 is 1, the program will print all debugging information.
    # Of course putting a "#" in front of a show() statement will
    # suppress it.  Note that "continueDoh=0" or "pass" can be 
    # inserted in an empty clause of an IF statement.
    #
    #tested ok
    # stored in /home/pi/Desktop/Python_new/ix_py_test/
    # stored in C:/  . . . /155/
    
    # useful for debugging Python code
    # prints the name of the class of "a", "a" itself and value
    
    # precede by p=0 (at top of code) to suppress showing valid variables
    # it will still do the error checking and report errors
    
    #these all are analysed correctly
    #abcd="a123b"
    #abcd=25
    #abcd=0b110
    #abcd=0x101
    #abcd=25.3
    #abcd=25E5
    #0.1
    #"0.1.2.3"        !doh
    #abcd="-h"
    #blah=["a","b","c"]
    #abcd=True
    #"None"
    #abcd="Null"
    #"-h"
    #"Null"
    #"xyz" when not yet defined

    # eg blah=123
    # p=1     #set p=0 to suppress printing
    # show("blah",p)
    # prints  blah: 123
    # Note without "try" produced system error if variable blah is not defined
    #                  abcd=                25  or "a123b"
/show.txt