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Add An Entry
4:04If we're going to have a diary, we have to be able to add entries to it. Let's use sys.stdin so we can capture new lines and tabs and all sorts of other goodies.
[MUSIC]
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Well, we have a table and a menu for
actions.
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Let's write the function that'll actually
let us add entries to the database.
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Python comes with a library named SYS that
relates to system functionality on
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your computer.
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We're gonna use a great feature of that
library, STDIN, so
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that we can capture an entry that has new
lines in it.
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Since we're going to be using the sys
library, we should probably go ahead and
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import it.
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[BLANK_AUDIO]
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Not that it's really important, but
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I'd like to point out that we have the
stuff that comes from Python here, and
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then a blank line, and then the stuff that
comes from a third-party library.
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This is a really good and really common
way of organizing your imports.
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I suggest that you kinda stick to it.
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Okay.
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Let's come down here and check out our Add
Entry function.
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Cuz this is where we're gonna use sys.
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So, it's gonna capture everything that the
user types,
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until they enter what's known as an End of
File key sequence, an EOF key sequence.
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The way that you get this End of File is
by pressing CTRL and D at the same time.
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So, let's tell the users that.
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So print, Enter your entry, press CTRL D
when finished.
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Kay.
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Now, we need to actually capture their
input.
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And this is where the STDIN that I talked
about comes into play.
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So let's call this data,
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and it's gonna be sys.stdin, which is just
like the keyboard.
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And then read, bringing in all the data,
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everything that comes in from here, and
then, oops, and then strip.
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Get rid of any of the white space on
either side of that.
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Now though, we need to make sure that we
actually got something from them.
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So let's say if data.
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So cool, we've got data.
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Something actually came in.
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And then, let's make sure that they want
to save this.
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So if input save entry?
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And we're gonna have a Y and an N, and
then we're gonna lowercase that.
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So if that comes in, and it doesn't equal
n, input comes in,
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they answer with anything other than n
upper case or lower case doesn't matter,
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but anything other than the letter n
[LAUGH], then we wanna do something.
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And what we wanna do is we wanna call
entry.create cuz we're creating a new
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entry, right?
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Did you forget about the model?
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I almost did.
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And we're gonna say the content of our
entry is the data that they just typed.
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And then let's print out saved
successfully.
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And that's it.
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We don't have to do anything else.
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Well we do have to add another blank line
there.
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So we're creating an instance for printing
out a message.
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I'm pretty sure that covers all the stuff
we have to do on adding an entry.
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So let's try it.
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Come right down here ./diary.
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Oh, I love that.
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So much better.
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All right, and let's say A for add an
entry.
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And I'm gonna my entry.
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So I'm gonna say working with databases
has been really neat.
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I'm glad I can show this off.
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I can even have multiple lines.
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Okay.
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And then I hit CTRL and D.
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It comes back with save entry.
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So I'm gonna say yes.
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Actually I can just press Enter.
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And it came back with Saved Successfully.
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That's great.
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Let's try doing one where I don't wanna
save it.
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I don't want to save this entry.
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Ctrl+D, no don't save that.
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It just goes straight back.
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I didn't save anything.
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It just takes me straight back to the
menu.
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I think this is actually working really,
really well.
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Now that we can add things, we need to be
able to see them.
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Let's tackle that in the next video.
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