5 Letter Words With C L I – Welcome to the second Click tutorial on how to improve your line tools with Python scripts. I’ll show you some more advanced stuff to help you if things are a little complicated and show richness in your writing.
. I don’t think they are bad tools, they all have their place and being part of the shared library gives them a great opportunity. However, I think Click is easier to use and requires less boilerplate code to write clean and easy to use linear programs.
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I go into more detail about this in the first tutorial and also give you a full introduction to Click. I also recommend watching it if this is your first time hearing the name “Click” so you know the basics. I will wait for you here.
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Now that we’re all starting from the same level of understanding, let’s grab a cup of tea, a glass of water, or whatever feels rewarding and happy learning ✨. And we will continue to find:
We will continue to build on the example we showed in the previous tutorial. Together, we built a simple command-line tool that interacts with the OpenWeatherMap API.
You can see the full code on Github. As a little reminder, this is what our final line tool looked like:
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In this tutorial, we extend the existing tool by adding functions to save information to a structured file. You will also learn many ways to test the user experience in your Python applications.
In the example, we need to specify the API key every time we call the command line tool to access the main web API. This can be very annoying. Let’s consider some options we need to improve how our tool handles this.
One of the first things that comes to mind is storing the API key in a variable environment in a 12-factor style.
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This is great, but it means we have to manually combine it with the Click parameter we already have. Fortunately, Click already allows us to provide custom parameters such as environment variables. We can use it
Optional if the variable is not defined. And because examples speak louder than words, here’s how you use the command with an environment variable:
You may be wondering what happens when the environment variable is defined and the option is added when using the value tool. The answer is simple: the option to disable the environment variable.
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I’m sure you’ll agree that it could be better. If you have worked with a command line tool such as
They use a formal argument as a new command (also called a subcommand) to perform a specific function. E.g
Wouldn’t it be great if we could do the same for our air conditioning? Well, it is possible! And you will see how easy it is.
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We can use Click commands and groups to implement our own version of this. And believe me, it looks more complicated than it really is.
Let’s start by looking at our price order and define the order we want to get. We will move the existing works into a directory and name them.
So how do we do this? We start by creating a new entry point for our weather control and register it as a group:
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We work in a content management group that we can use to register new rules “down”. That means, let’s change ours
The change I made above is clearly not adequate in itself. What we wanted to add was a way to store an API key in a configuration file using another command. I suggest naming them
Then we store the key in a file that we will place in the user’s home directory: e.g.
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We start by adding a new function to our Python module with the same name as our command and registering it in our main section:
I placed another order and still nothing. What we need is the API key from the user so we can store it in our file. Let’s start using
We currently store the API key provided by the user in our file system. But how do we ask the user for the API as we showed you above? Using the appropriate name click.prompt.
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Command prints the query asking the user for the API and receiving its value
Option and use it as an invalid value to force means the user can hit
There is a lot of new functionality, but the code required is minimal. I’m sure you’ll agree that this is great!
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Until now, we have completely ignored what type of share we receive from a user. By default, Click uses a string and doesn’t really care about anything beyond that. It makes it easier, but it also means we can get more 🚮.
As you might have guessed, Click has a solution for that too. Of course, there are many ways to use parameters, but we’ll look at Parameter Types for now.
The name gives a good example of what it does so we can define the type of our series. The most obvious are the built-in Python types such as str, int, float, but Click also offers additional types: Path, File, and more. A complete list is available in the Parameter Types section.
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Making sure a user is a certain type is as easy as it gets. Just pass the editor the type of parameter you expect
Look at our API key, we expect a string of 32 hexadecimal characters. Take a look at this Wikipedia article if that doesn’t make sense to you, or believe me when I say that each character stands for a number between 0 and 9 or a letter between a and f.
Is there some kind of code for this, you ask? No, it is not. We have to build our own. And like everything else, it will be very easy (I feel like a broken record right now 😇).
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Why do we need to implement our own paragraph type? We need to do two things: (1) define a new Python derived class
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It refers to the background of the commandment, which we will discuss later in this lesson.
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The last thing to keep in mind is the return price. Click wait for us to return the deleted value and validate it for the code or raise an error if the value is invalid. If we raise an exception, Click will automatically crash and tell the user that their value is of the wrong type. Nice, right?
So much talk and no code, so let’s stop here, take a deep breath and look at the implementation.
You can see that we only care about the importance of our paragraph. We use a regular expression to check a string of 32 hexadecimal characters. I won’t go into detail here, but Al Sweigart does in this PyCon video.
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And it’s over! The user will now get an error if their API key is set incorrectly and we can end those sleepless nights 🤣.
I have sent you a lot of information. I have one thing I want to show you before I end this teaching. But if you need a quick break, go find a sweet, hot or cold drink and read on when you feel refreshed. I’m going to get some ☕️ and be back soon…
Okay, come back 😉. You may have thought about the command we created, our new option API, and wondered if that means we should define the option for both commands,
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. And you would be right. Before you roll your eyes and yell at me “No! I like my code DRY!”, there’s a better way to do it. And if DRY means nothing to you, check out the Wikipedia article on the “Don’t repeat yourself” principle.
How can we avoid implying the same choice in both commands? We use a component called “Context”. Click to execute all commands in a context that contains the command definition as well as user input. And it comes with a named attachment
First, let’s take a look at our section and how we can access our main site definition:
Command Line Interface
What we’re doing here is telling Click that we want to get the command (or group) information, and Click will pass our function the first argument, I mentioned.
Can also be an instance of a common class that we implement, but keep it simple. You can imagine the flexibility of this. The one thing you can’t do is give your information anywhere, but
Edited, the story will be
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