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back and improve your code but of course
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if you read the documentation you
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ingrain some of the lessons learned from
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the past you'll get into the habit of
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trying and checking for some of these
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exceptions yourself so let me solve this
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in one possible way as you proposed here
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let's try to handle this exception as
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follows let me go ahead now and instead
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of just blindly calling this print line
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let me try
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to print out hello my name is such and
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such except if there is an issue
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specifically an index error then what do
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i want to go ahead and do i'm going to
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say something like too few arguments i
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could be more explanatory than that but
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for now i'm just going to explain to the
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user that they gave me too few arguments
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too few words at the prompt so now it's
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still not going to work in quite the way
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i want i'm still not going to be able to
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generate their name tag but at least
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they're not going to see some cryptic
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error message and think that they
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themselves broke the program let me go
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ahead now and run python of name.pi
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enter and too few arguments okay let me
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go ahead now and do python of name.pi
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and type in my name david and now we're
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back in business and i see that my name
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is on the screen too
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but strictly speaking i don't have to
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try to do this i could actually be a
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little more defensive in writing this
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code and maybe i could check whether or
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not the user has indeed provided a name
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or multiple names at the prompt so as to
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give them more refined error messages as
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well so how might i do this well let me
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go and undo the exception handling i've
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added and why don't i instead more
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modestly try to do this let me go ahead
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and introduce a conditional here if the
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length of cis.rgv
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is less than two or equivalently equal
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to just one value but i'll just stick
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with less than two for now
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then go ahead and print out too few
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arguments so i want ultimately two
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arguments i want the name of the program
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at location zero and i want the name of
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the human at location one so that's a
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total of two arguments so if i have
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fewer than two arguments let's tell the
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user with this print line l if the
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length of sys.rgv
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is say greater than two like they typed
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in too many words at the prompt well
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let's tell them print quote unquote too
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many arguments else if they did get it
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right and they gave me exactly two
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arguments else let's go ahead and print
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what i actually care about all right let
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me go down to my terminal window here
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and run python of name.pi and voila
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a completely different type of error
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this one a syntax error which we've seen
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in the past now a syntax error recall is
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me a culpa like i messed up here and i
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wrote invalid syntax and so no amount of
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conditionals or exception handling is
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really going to catch this one i need to
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go back and just get my program to work
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because it's not running at all well let
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me go up here and see
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line 4 is the issue and indeed it looks
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like i have an unterminated string here
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i need to go ahead and now add this
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double quote so let me go ahead now when
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with that red herring gone let me rerun
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python of name dot pi and hit enter and
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now we see too few arguments okay maybe
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it wants my full name let me go ahead
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now and run python of name dot pi david
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malin typing in both words after the
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name of the file and hit enter and now
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of course it's too many arguments fine
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now i'll oblige and do python of name.pi
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and just david and there we have it my
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name tag printed on the screen so
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strictly speaking we don't have to
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handle exceptions if we can be a little
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smarter about it and just check for the
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things that we're worried about
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especially if we want to give the user
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more refined advice we don't want to
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just tell them no something went wrong
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or we don't want to pass we want to tell
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them no that's too few or no that's too
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