Python support for Dashboard

[mvladic]

Components

PythonRun

Run python script from file or inline code. This component will also propagate - to dashboard flow - messages received from python script stdout, i.e. print statement.

Properties

Name	Description
Script source option	"Inline script", "Inline script as expression" or "Script file"
Script source	Source code as string literal or string expression or file path, depending on "Script source option" property
Python path	The path where to locate the "python" executable. Default is empty string which means to use "python3" or "python" on Windows (must be in PATH).

Outputs

Name	Description
handle	An integer value used as "handle" for this python script. To be used in PythonSendMessage and PythonEnd components to communicate/control python script.
message	Message emitted from the python script using stdout stream, i.e. using print statement. Note: as stdout is buffered, use sys.stdout.flush to flush data collected so far, which will result to imeddiate propagation through this output into the flow. Example: import sys print(message) sys.stdout.flush()

Note: This component will propagate through @seqout only after execution of the script is done.

PyhonSendMessage

Properties

Name	Description
handle	Value propagated from the handle output of PythonRun component.
message	The message to be sent to the python script, which will receive it through stdin. Example: for message in sys.stdin:     process_message(message)

PythonEnd

Close stdin, so Python script can end as script can detect that stdin is closed. For example, the loop:

for message in sys.stdin:
    ...

Will break after stdin is closed.

Properties

Name	Description
handle	Value propagated from the handle output of PythonRun component.

Example

Example of using matplotlib module to draw charts inside dashboard flow:

Source of this dashboard project is located here: https://github.com/eez-open/studio/tree/master/docs/tutorial/python