Background

I have a HTML form that I am trying to submit using the Python Requests module.

This is the HTML for the form:

<form name="main" id="main" method="post" onSubmit="return validateForm(this);">

Javascript files involved

The validateForm() function looks like this:

      function validateForm(form)
      {
        if (form.buttonClicked[0].value == "delete"){
          deleteCount += 1;

          if (deleteCount > 1){

           return false;
          }
          if(form.allowValidateOnDelete && form.allowValidateOnDelete.value == "true")
          {
            deleteCount = 0;
            return validate(form);
          }
          else
          {
            return true;
          }
        }
        else{
          return validate(form);
        }
      }

This is validate()

function trimAll(form)
{
  form.forwardedToNumber.value = trim(form.forwardedToNumber.value);
}

function validate(form)
{
    trimAll(form);

    for (var i=0; i < form.active.length; i++) {
      if (form.active[i].checked) {
        if (form.active[i].value == "false") {
          return true;
        }
      }
    }

    if (form.forwardedToNumber.value == "") {
        alert(errorText(1000, errorText(2201)));
        form.forwardedToNumber.select();
        return false;
    }

    return true;
}

Question

How do I submit this form using Python?

I can't really submit the below example because it doesn't make sense as a URI:

session.request(
    'POST', 
    'https://example.com/return validateForm(this);', 
    data={'active': 'true'}
)

How I would go about submitting a form which has a target of return function(); ?