pass statement at now when filenotfounderror is raisedthe code in the except block runsbut nothing happens no traceback is producedand there' no output in response to the error that was raised users see the word counts for each file that existsbut they don' see any indication that file was not foundthe file alice txt has about words the file moby_dick txt has about words the file little_women txt has about words the pass statement also acts as placeholder it' reminder that you're choosing to do nothing at specific point in your program' execution and that you might want to do something there later for examplein this program we might decide to write any missing filenames to file called missing_files txt our users wouldn' see this filebut we' be able to read the file and deal with any missing texts deciding which errors to report how do you know when to report an error to your users and when to fail silentlyif users know which texts are supposed to be analyzedthey might appreciate message informing them why some texts were not analyzed if users expect to see some results but don' know which books are supposed to be analyzedthey might not need to know that some texts were unavailable giving users information they aren' looking for can decrease the usability of your program python' error-handling structures give you finegrained control over how much to share with users when things go wrongit' up to you to decide how much information to share well-writtenproperly tested code is not very prone to internal errorssuch as syntax or logical errors but every time your program depends on something externalsuch as user inputthe existence of fileor the availability of network connectionthere is possibility of an exception being raised little experience will help you know where to include exception handling blocks in your program and how much to report to users about errors that arise try it yourse lf - additionone common problem when prompting for numerical input occurs when people provide text instead of numbers when you try to convert the input to an intyou'll get typeerror write program that prompts for two numbers add them together and print the result catch the typeerror if either input value is not numberand print friendly error message test your program by entering two numbers and then by entering some text instead of number (continuedfiles and exceptions