[Tutor] How to... (a) write to files, (b) use try/except
kent37 at tds.net
Sun Feb 10 02:33:21 CET 2008
Rob Stevenson wrote:
> Title = book.ProductName
> printstring = isbn + "\t" + book.ProductName + "\t" +
> book.Authors.Author + "\tUsed from...\t" + book.UsedPrice + "\tNew
> price\t" + book.OurPrice
> print printstring
> print printstring >> fle
Should be fle.close(), you need the parentheses to make a function call.
> Now I have two problems
> 1) the file c:\321.txt (which does exist) never gets written to. I also
> tried using
> and fle.writeline(printstring) but they didn't do anything either.
Assuming that there are some results, it is probably the lack of a
proper close that is the problem.
> 2) if any of the function calls from amazon.py, such as book.UsedPrice
> fails then the rest of the details that may well have been retreived for
> that get lost in the jump to the except block. I'd really like to get
> whatever info I can on the printstring assignment line and ignore any
> errors, perhaps substituting 'none' instead of a retrieved value.
Instead of book.UsedPrice you can say getattr(book, 'UsedPrice', 'none')
which will return the string 'none' if the attribute is not available.
> Also, a point of nettiquette for this list - how do I say thanks to
> people - not to the list, but in direct emails?
I think either way is fine.
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