Now that we have the script checking for invalid pollutants, let’s work on handling the other two inputs: the IDs and the directory.
Initial Errors: Invalid IDs
I’m going to do this with a slightly different approach than the pollutants. The way I see it, there are a couple of ways that the input could be incorrect. The user could either supply only invalid IDs or invalid IDs could be supplied along with valid IDs. For example, let’s say the user specifies the range 300:400. For our purposes, the range 300:332 is valid, but 333:400 is invalid. I could have the program error out if any invalid IDs are supplied, but instead what I’m going to do is first strip the invalid IDs and then only terminate the program if no valid IDs remain.
To do this I’m going to write another function. Since this function is going to bound…
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realowded 