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The easiest way of catching and handline errors is to use try:.. except:.. block around all your code as shown below:
try:
raise Exception('This error will be caught and nicely displayed')
except:
print "An error occured"
If you want more control than this you can use the web.error module is as follows:
import web.error
web.error.handle()
raise Exception('This error will be caught and nicely displayed')
This will produce a full HTML page giving the tracback of the error.
Python allows you to put both lines of code on one line to make things look neater if you use a ; so in some of the following samples the error handling initialising will look like this:
import web.error; web.error.handle()
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