>>> * one should also avoid using "i" and "I" as variables for the same
>>>  obvious reason as for "e"
> 
> 
> I've also run into problems when using "n" or "N" as a variable, since that 
> is the numeric approximation function (that is used later in the tutorial).

Thanks for this tip!

>>> * just a comment: I never used del(); in fact, I didn't know it existed
>>>  before reading your intro (thanks!); I normally just define f to be
>>>  the next thing I'm interested in.  Actually, I don't know how to get
>>>  information about del() in Sage; trying del? is not successful.
> 
> 
> That's because del is not a function, but is a keyword in Python:
> 
> http://docs.python.org/reference/simple_stmts.html#the-del-statement
> 
> I think the pythonic way of using it is without the parentheses, as shown in 
> the manual above.  Dana, I'd suggest you change the example to not use 
> parentheses.

OK.  I think I copied this from one of Ben Woodruff's worksheets, but I could 
be wrong (I borrowed it from somewhere).

Thanks.

Dana

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