Python code

Runs custom Python code. Useful for logic not covered by existing blocks.

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Overview

The Python code block allows you to write Python code to extend your blueprint’s functionality.

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Available variables and libraries

Python code block can access the following global variables and libraries:

• State variables
• Execution environment variables
• Pre-installed Python libraries
• Functions you’ve defined in your main.py file

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Return values from the Python code block

To return a value from a Python code block and store it in the result execution environment variable, you must use the set_output function.

Anything that runs in the block but is not returned in the set_output function does not get passed to the next block.

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Example: Calculate the average of a list of numbers and return the result

The example python code below shows how to return a value from the Python code block. It calculates the average of a list of numbers and returns the result the next block by using the set_output function.

The following Set state block stores the result in the final_result state variable to display in the UI.

def calculate_mean(numbers):
    return sum(numbers) / len(numbers)

average = calculate_mean(state["numbers"])
set_output(average)

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Fields

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End states

Below are the possible end states of the block call.