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relatively simple syntax in python we
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can use square brackets not just to go
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to specific elements like bracket zero
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or bracket one we can also get subsets
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of the list slices of the list by doing
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bracket something colon something where
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each of those somethings is a number the
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beginning or the end and they're
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optional depending on whether you want
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all of them or just some
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any questions now on this version which
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adds the loop
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and these slices with that new syntax
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can we slice starting from the end
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of the argument argument vector
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you can you can slice something from the
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end of the argument vector and this
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might uh this might blow one's mind a
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little bit let me go ahead and do this
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uh let's see let me go ahead and do
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negative one at the end using a negative
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number here and running the same command
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we've just uninvited wrong shin from
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receiving a name tag here so if you use
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a negative number it has the effect of
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counting to the uh in the other
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direction from the end of the list a
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good question there other questions now
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on slices on
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looping over sys.rgv
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hi uh so i remember very early on uh
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when we were talking about uh only
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having two decimal places in uh in an um
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float value um
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does this
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is is that in the same vein like um
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because we use the the colon point two f
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uh so that's is that the same thing then
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uh why would the f be included then
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in the point two f
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as opposed to here when you just have
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the numbers
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a really good question and it's just the
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short answer is that context matters so
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there's only so many keyboard keys on
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our keyboard and so we sometimes use the
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same symbols for different things so
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what you're alluding to is the format
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code in in fstring for actually
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formatting a number using a colon using
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a period using a number using the letter
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f and so forth and that is very specific
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to the f string feature of python this
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case has nothing to do with any of that
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syntax per se this is just using a colon
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in a different context to solve this
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problem to implement a slice the authors
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of python could have chosen another
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symbol but honestly looking down at my
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keyboard here we don't have that many to
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choose from that are easy to type so
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sometimes they have different meanings a
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good question as well allow me to
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propose now that we take things further
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and move away from using only those
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modules those libraries that python
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comes with to talk about more generally
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packages that exist one of the reasons
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that python is so popular and powerful
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these days is that there's a lot of
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third-party libraries out there as well
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otherwise known as packages strictly
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speaking python itself has a term of art
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called a package which is a module
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essentially that's implemented in a
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folder not just a file but a folder but
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more generally a package is a
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third-party library that you that i can
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install on our own mac or pc or our
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cloud server and gain access to even
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and this is a website that is searchable
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via the command line as well as via the
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web that allows you to download and
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install all sorts of packages even cs50
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has some of its own packages
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in services like these now there's a fun
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one out there that's a throwback to a
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command that's been around for years in
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command line environments called cowsei
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causee is a package in python that
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allows you to have a cow say something
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on your screen if curious to read up on
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it its own documentation is on pipi.org
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specifically at this url here but how do
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you actually get the package into your
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system well technically you could figure
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out how to download the file and maybe
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unzip it and put it into the right
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location on your mac or pc but nowadays
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a lot of languages python among them has
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