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Here is an example of a simple Click program: import click @click.command() @click.option('--count', default=1, help='Number of greetings.') @click.option('--name', prompt='Your name', help='The person to greet.') def hello(count, name): """Simple program that greets NAME for a total of COUNT times.""" for x in range(count): click.echo(f"Hello ...
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Python clickmodule is used to create command-line (CLI)applications. It is an easy-to-use alternative to the standard optparse andargparse modules. It allows arbitrary nesting of commands, automatic help pagegeneration, and supports lazy loading of subcommands at runtime. The clickmodule was created as a supporting library for the Flaskweb framewor...
The following is a trivial CLI example. The example creates a command that outputs a message. Click uses the echo instead of the print.It increases compatibility and adds colouring support. Click creates some help messages out of the box.
Arguments are added with the click.argumentdecorator. Thearguments may have default values. The example builds a message with the given argument value. If there is noargument, the default guest is used. The argument is passed to the function as avariable. We run the program with and without an argument.
We can specify the argument types, including int, float, str, bool, choice andvarious ranges. The default one is str. In the example, we have two arguments: name and age. They are generated positionally, the first is name, the second is age.
With the nargs option, we can set that an argument takes multiple values. For the -1value, the argument may take variable number of values. The example creates a process command, which may take variable number of integervalues in the valsargument. The command calculates the sum and the product of the values.
Options are added to commands with the click.optiondecorator.Option names are prefixed with one or two dashes. In the example, we have the --noption which takes a number. The number determines how many times the dot is printed to the console. We have outputted seventeen dots.
The options names start with either a single dash or two dashes. Command line programs often take both short and long options. Click derives the name of the option from the long name, if both are used. In the example, we create an option with both short and long names.The name of the variable passed to the function is string, derivedfrom the longer...
We can ask a user to provide a value interactively. The example asks the user for his name. This is a sample output.
With the sechomethod, we can output the text in colour. We canalso use styles such as bold and underline. The colour values are limited to apredefined set of values. For colour output we need to have installed thecolorama module. The example outputs the text in bold blue colour.
Flags are boolean options that can be enabled or disabled. This can be accomplished by defining two flags in one go separated by a slash(/) for enabling or disabling the option or with the is_flagparameter. In the example, we define a --blue boolean option with the is_flagparameter. If set, it prints the message in blue colour. In the second case, ...
23. Aug. 2023 · In this tutorial, you’ll learn how to: Create command-line interfaces with Click and Python. Add arguments, options, and subcommands to your CLI apps. Enhance the usage and help pages of your CLI apps with Click. Prepare a Click CLI app for installation, use, and distribution.
Adding options to commands can be accomplished by the option() decorator. Since options can come in various different versions, there are a ton of parameters to configure their behavior. Options in click are distinct from positional arguments.
Example usage: import click @click.group() def cli1(): pass @cli1.command() def cmd1(): """Command on cli1""" @click.group() def cli2(): pass @cli2.command() def cmd2(): """Command on cli2""" cli = click.CommandCollection(sources=[cli1, cli2]) if __name__ == '__main__': cli() And what it looks like: $ cli --help.
17. Aug. 2023 · Click is a Python package for creating beautiful command line interfaces in a composable way with as little code as necessary. It’s the “Command Line Interface Creation Kit”. It’s highly configurable but comes with sensible defaults out of the box.
A Simple Example. import click @click.command() @click.option("--count", default=1, help="Number of greetings.") @click.option("--name", prompt="Your name", help="The person to greet.") def hello ( count, name ): """Simple program that greets NAME for a total of COUNT times.""" for _ in range ( count ): click. echo ( f"Hello, {name}!"
