How to use python code in node red pythonshell node
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node-red is a powerful visual programming tool that allows you to wire together devices, apis, and online services. using python code in node-red can be done through the `python-shell` node, which allows you to run python scripts and retrieve their output.
prerequisites
1. **node-red installed**: ensure you have node-red installed. you can install it via npm if you have node.js installed:
2. **python installed**: make sure you have python installed on your system. you can verify this by running:
3. **python-shell package**: you'll need the `python-shell` package. you can install it in your node-red directory:
setting up node-red to use python
1. **start node-red**: launch node-red by running:
this should open node-red in your default web browser at `http://localhost:1880`.
2. **create a new flow**: click on the "+" button to create a new flow.
3. **add the `python-shell` node**:
drag and drop the `exec` node from the palette on the left into the flow workspace.
double-click on the node to configure it.
example python code
let's create a simple python script that adds two numbers and returns the result. create a python file named `add_numbers.py`:
configure the node in node-red
1. **set up the `exec` node**:
in the `exec` node configuration, set the command to `python3` (or `python`, depending on your setup) followed by the path to your python script. for example:
in the "add payload" section, set the payload type to "json" and provide the input. for example:
2. **connect the nodes**:
connect an `inject` node to the `exec` node.
connect the `exec` node to a `debug` node to see the output.
example flow
here’s how the flow might look:
1. **inject node**: to trigger the flow.
2. **exec node**: runs the python script.
3. **debug node**: displays the output in the debug window.
complete flow json
you can import the following json directly into node-red:
r ...
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