The Python Click library will search for the innermost object (in context) of the type we specified above (dict) and pass that to our function.
Let’s make a command that will use the pass_dict decorator to pass in the dictionary object that is stored. Pass_dict = click.make_pass_decorator(dict) The last object stored of a type of our choosing in the context Here we'll make a pass decorator, which we can use to pass Let’s make a pass decorator to specifically pass a dictionary object through, we'll call it pass_dict.
Cliclick example how to#
Why would we make our own? So that we can pass a specific type of object through (later we’ll also demonstrate how to use pass_obj). Now that we have some familiarity with decorators and Python Click, let’s use Click’s functionality to make our own pass decorator. Which we expect to be a json looking check_context(ctx): Here we'll create an example command that prints out our context object, Passing Context in Python Click import creates a command that can be called with To make sure that this object is able to access context, we also use the pass_context decorator. Earlier we said that we want to load our object as a dictionary into our context, so we should expect a result like:Īll we have to do to make this command a part of the group we created earlier is decorate our function with the decorator. Let’s make a command that will check the context for us to confirm that we have the right type. Now that we’ve created our first group in Python Click, let’s add our first command to it. NOTE - all commands must be defined between main() and our oup decorator. Yours shouldn’t have all the commands listed yet, but that’s just a sneak peak at what we’re going to build. Upon creation of our group and declaring it in main, we should have an automatically generated "-help" option, like so: """An example CLI for interfacing with a document""" In our example we'll name our group cli(ctx, document): The context, the context is not visible to the command unless we pass this Import creates a command that instantiates a group classĪ group is intended to be a set of related tells us that we will be passing an argumentĪnd referring to that argument in the function by the name we pass tells the group command that we're going to be using
In a group command, the context object is used to pass information between commands. The context is an object that holds all the context of the execution of a command. All of the commands in this group will interact with our loaded dictionary, so we will use the pass_context decorator to keep the dictionary stored in context.
Cliclick example download#
This group that we’re going to make is going to be based around interacting with a JSON document, you can either download this from the link, or follow the tutorial towards the bottom of the page that will show you how I generated it using AssemblyAI, which we’ll load as a dictionary. Let’s get started, the first thing we’re going to do is create a group, in click, a group is a set of (supposedly) related commands. My reasoning, as a developer, for picking Click is that it’s easy to use and it provides the necessary capabilities to create complex command line interfaces. Click provides their own rationalization as to why you should use Python Click over other Python CLI libraries. The three main points of Python Click are arbitrary nesting of commands, automatic help page generation, and supporting lazy loading of subcommands at runtime.
Cliclick example code#
If you have any questions please don’t hesitate to reach out to me You can find the source code here.Ĭlick, or “Command Line Interface Creation Kit” is a Python library for building command line interfaces. This example Python project will show you how to interact with different click commands from the building blocks such as mand to the more advanced commands such as click.make_pass_decorator. What can Python Click do for you? At the end of this guide, you’ll be able to create your own command line interfaces that can pass context, with commands that can take mandatory or optional arguments, and nested commands. Share on Twitter Share on LinkedIn Share via email
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