error handling in Python
beliavsky at aol.com
beliavsky at aol.com
Wed May 5 11:41:22 EDT 2004
Suppose I have a function
def read_data(xfile):
# code here to read dates and prices
return dates,prices
that if successful returns two Numeric arrays, of dates and prices. I
am unsure what to return if read_data is unsucessful. Since a
successful function call returns a list of length two, I could return
a list of length one if there is a problem, so that [-1] is returned
if the file does not exist, [-2] if the dates are invalid, etc. After
calling the function, I could check the len of the result to detect
problems. This seems workable but ad-hoc.
I do NOT want to use the try/except idiom to stop the program if there
is a problem reading data.
In Fortran I would write a subroutine with calling sequence
call read_data(xfile,dates,prices,ierr)
where ierr would be checked upon return for nonzero values.
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