In this exercise we will cover one more input method you can use to pass variables to a script (script being another name for your .py files). You know how you type python ex13.py to run the ex13.py file? Well the ex13.py part of the command is called an "argument." What we'll do now is write a script that also accepts arguments.
Type this program and I'll explain it in detail:
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On line 1 we have what's called an "import." This is how you add features to your script from the Python feature set. Rather than give you all the features at once, Python asks you to say what you plan to use. This keeps your programs small, but it also acts as documentation for other programmers who read your code later.
The argv is the "argument variable," a very standard name in programming, that you will find used in many other languages. This variable holds the arguments you pass to your Python script when you run it. In the exercises you will get to play with this more and see what happens.
Line 3 "unpacks" argv so that, rather than holding all the arguments, it gets assigned to four variables you can work with: script, first, second, and third. This may look strange, but "unpack" is probably the best word to describe what it does. It just says, "Take whatever is in argv, unpack it, and assign it to all of these variables on the left in order."
After that we just print them out like normal.
I call them "features" here (these little things you import to make your Python program do more) but nobody else calls them features. I just used that name because I needed to trick you into learning what they are without jargon. Before you can continue, you need to learn their real name: modules.
From now on we will be calling these "features" that we import modules. I'll say things like, "You want to import the sys module." They are also called "libraries" by other programmers, but let's just stick with modules.
Run the program like this (and you must pass three command line arguments):
This is what you should see when you do a few different runs with different arguments:
$ python ex13.py stuff things that The script is called: ex13.py Your first variable is: stuff Your second variable is: things Your third variable is: that $ $ python ex13.py apple orange grapefruit The script is called: ex13.py Your first variable is: apple Your second variable is: orange Your third variable is: grapefruit
You can actually replace first, 2nd, and 3rd with any three things you want.
If you do not run it correctly, then you will get an error like this:
This happens when you do not put enough arguments on the command when you run it (in this case just first 2nd). Notice when I run it I give it first 2nd, which caused it to give an error about "need more than 3 values to unpack" telling you that you didn't give it enough parameters.