Send output to a PHP input field
You have to expose the data to the Internet - either create an upload script in PHP that will receive data whenever your Python script captures the new weight (you probably don't want this approach), or write a PHP script that will execute the Python script, take its output and send it back to you. You can then reload the whole page or use JavaScript to update the input field
Hope this helps you, comment if you have any questions
Is it possible to send the result of a Python script to the input field of a PHP page? 
I am using a PYTHON script to capture weight data from a scale. I would like to use that data from the python script, placing it into the input field of a PHP page.
The name of the input field on the page will remain static, as will the name of the page.
To initiate the process (from python script to the input field) I would use an on click command or something similar. 
I am very new to python and very much appreciate any help.
Bob