180 lines
3 KiB
Markdown
180 lines
3 KiB
Markdown
# Argh
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{:.no_toc}
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<nav markdown="1" class="toc-class">
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* TOC
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{:toc}
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</nav>
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## The goal
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Argh helps to handle command line arguments in a big way. Don't use the build-in Python stuff for that.
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Questions to [David Rotermund](mailto:davrot@uni-bremen.de)
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```shell
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pip install argh
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```
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## Simple example
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### No argument is required
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The arguments are now only optional for the function call:
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```python
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import argh
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def main(first_parameter: int = 1, second_parameter: int = 2, third_parameter: bool = True) -> None:
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print("Main")
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if __name__ == "__main__":
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argh.dispatch_command(main)
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```
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```shell
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python test.py
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```
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Output
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```shell
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Main
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```
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```shell
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python test.py --help
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```
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Output
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```shell
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usage: test.py [-h] [-f FIRST_PARAMETER] [-s SECOND_PARAMETER] [-t]
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options:
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-h, --help show this help message and exit
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-f FIRST_PARAMETER, --first-parameter FIRST_PARAMETER
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1
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-s SECOND_PARAMETER, --second-parameter SECOND_PARAMETER
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2
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-t, --third-parameter
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True
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```
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Note: For boolean parameters using the option switches them to the other state. Here **python test.py** sets **third-parameter=True** and **python test.py -t** sets **third-parameter=False**.
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### One argument is required
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```python
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import argh
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def main(first_parameter: int, second_parameter: int = 2, third_parameter: bool = True) -> None:
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print("Main")
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if __name__ == "__main__":
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argh.dispatch_command(main)
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```
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```shell
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python test.py
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```
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Output
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```shell
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usage: test.py [-h] [-s SECOND_PARAMETER] [-t] first-parameter
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test.py: error: the following arguments are required: first-parameter
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```
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```shell
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python test.py 1
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```
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Output
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```shell
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Main
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```
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## More than one function
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Sometimes we have a collection of function. This is how we select one of those:
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```python
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import argh
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def main_1(
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first_parameter: int = 1, second_parameter: int = 2, third_parameter: bool = True
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) -> None:
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print("Main 1")
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def main_2(first_parameter: int = 1) -> None:
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print("Main 2")
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if __name__ == "__main__":
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parser = argh.ArghParser()
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parser.add_commands([main_1, main_2])
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parser.dispatch()
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```
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```shell
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python test.py
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```
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Output
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```shell
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usage: test.py [-h] {main-1,main-2} ...
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```
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```shell
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python test.py main-1
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python test.py main-2
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```
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Output:
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```shell
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Main 1
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Main 2
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```
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```shell
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python test.py main-1 --help
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python test.py main-2 --help
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```
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Output:
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```shell
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usage: test.py main-1 [-h] [-f FIRST_PARAMETER] [-s SECOND_PARAMETER] [-t]
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options:
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-h, --help show this help message and exit
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-f FIRST_PARAMETER, --first-parameter FIRST_PARAMETER
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1
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-s SECOND_PARAMETER, --second-parameter SECOND_PARAMETER
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2
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-t, --third-parameter
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True
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usage: test.py main-2 [-h] [-f FIRST_PARAMETER]
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options:
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-h, --help show this help message and exit
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-f FIRST_PARAMETER, --first-parameter FIRST_PARAMETER
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1
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```
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