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Now that you've learned to create functions, learn to execute them by calling them.
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Calling a function is what
we do when we wanna use it.
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When your code is executed,
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it's interpreted from top to bottom,
line by line.
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If the interpreter encounters a function
call, it will jump to that function,
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execute all the code inside of it, and
then go back to its previous place.
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This means that you can execute
the code inside a function
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as many times as you want without having
to rewrite all that code or copy and
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paste a bunch of code
into the correct place.
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Instead, all you have to do is call
the function anytime you want to
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use the code instead of it.
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The syntax for
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calling a function is the function’s name
followed by a set of parens, that’s it.
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Let’s pick up where we left
off in the previous video.
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We wrote a function called
print_favorite_movie that you can see here
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in my workspace.
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This is a good name for
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a function, because it accurately
describes what the code inside is doing.
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When you, or another person, are reading
your code later on, you will know exactly
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what that function does without having to
familiarize yourself with the code inside.
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I can't emphasize enough how
important it is to write clear and
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direct function and variable names.
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I'll call the function now in
the same script file as the function.
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Then I'll save the file, and I'll move
down into the terminal where I'll run it.
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To run the file, I type python3,
which starts up the interpreter, and
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then the name of the file, so
it knows what's it running, and
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the name of our file here is functions.py.
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Then I hit Enter.
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Any output from the code
will be displayed below.
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Cool, it printed out Mean Girls,
my all time favorite movie.
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All right, now, you try.
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Before moving on to the next video,
call your print_favorite_movie function in
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your workspace, then save it and
run it down in the terminal.
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When you've gotten this to work, and
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you can see the function output in your
terminal, move on to the next step.
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If you're having trouble, go ahead and
ask a question in the Treehouse community.
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This is a great place
to practice asking and
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answering questions, and
it helps make you a better developer.
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