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that i have too few but i'm also going
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to see that same exception at the very
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top of my terminal windows output
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there's my error message too few
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arguments but again on line 10 i blindly
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proceed to still index into my list at
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location one which does not exist so it
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turns out there's a better way to handle
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errors like this especially if you're
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writing a program in python that's just
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meant to run briefly and then exit
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anyway but maybe we could start to exit
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prematurely if the program itself just
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can't proceed if the user has not given
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us the data we want perhaps we should
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just exit the program earlier than we
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might otherwise so let me go ahead and
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do this let me go ahead and remove my
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comments so as to focus only on the code
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here and let me propose that instead of
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just printing quote unquote too few
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arguments i'm going to use one other
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function that comes with the sys module
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i'm going to go ahead and call sys.exit
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and as the name suggests it's going to
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do exactly that with the systems help
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it's going to exit my program then and
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there on line four why is that okay well
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if you gave me too few arguments i have
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nothing more to say to you the user i
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might as well exit a bit prematurely and
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i can do this as well on line six let's
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go ahead and not just print that but
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sys.exit quote-unquote too many
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arguments print out that message and
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just exit right there
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now i can trust that by the time i get
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to line eight every error condition has
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been checked for and so it's safe for me
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to assume that there is in fact an item
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at location one in sys.rgv so let me go
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ahead now and run this
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python of name dot pi enter too few
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arguments but i'm back at my prompt
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nothing more has happened let me run it
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again python of name dot pi david malen
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with no quotes enter too many arguments
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is now printed here finally python of
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name dot pi just david enter hello my
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name is david so we have then insists
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two forms of functionality now we have
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access to this variable sys.rgv this
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argument vector that gives me all of the
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words that were typed at the prompt
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including the program's own file name
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and it turns out if we read further in
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the documentation there's an exit
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function that can take different types
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of inputs but if i pass it a string like
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this it will indeed print that string
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for me and then exit from my program
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then in there
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questions now on exiting from programs
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like this
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to be clear all of this time once python
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gets to the bottom of your file it's
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going to exit anyway so i'm using
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sys.exit now just to make sure that i
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exit earlier than otherwise um my
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question is about the cis that are
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our v
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so is that capable of accepting or
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taking multiple elements at once let's
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say for example
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a python name that pi david malin i'm
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a male uh 20 years old and if let's say
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i only want to access your name which is
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at the first index and then your
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your
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your age is brought say at the sixth
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index can i say
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cis.rb
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one
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and another one for six to access what i
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just want
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is that possible for cis harvey
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uh short answer yes i think if i
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understand your question correctly
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whereby you're proposing to have many
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words at the end of the command and you
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want to access those individual words
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absolutely at some point it gets a
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little fragile i would say if you're
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typing so many words at the prompt that
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the order really matters and so it turns
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out there's a lot of programs and
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there's functionality in python that can
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allow you to provide those values like
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name or age or any number of other
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fields in any order you want but pass in
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