drag_and_drop_file.py

def drag_and_drop_file(drop_target, path):
    # the function fakes the drag-and-drop that drags a file from the computer into a specific area to upload it.
    # THE COMPLETE CODE OF THIS FUNCTION IS TAKEN FROM STACKOVERFLOW:
    #   https://stackoverflow.com/questions/43382447/python-with-selenium-drag-and-drop-from-file-system-to-webdriver

    # javascript code that will be executed by selenium:
    JS_DROP_FILE = """
        var target = arguments[0],
            offsetX = arguments[1],
            offsetY = arguments[2],
            document = target.ownerDocument || document,
            window = document.defaultView || window;
    
        var input = document.createElement('INPUT');
        input.type = 'file';
        input.onchange = function () {
          var rect = target.getBoundingClientRect(),
              x = rect.left + (offsetX || (rect.width >> 1)),
              y = rect.top + (offsetY || (rect.height >> 1)),
              dataTransfer = { files: this.files };
    
          ['dragenter', 'dragover', 'drop'].forEach(function (name) {
            var evt = document.createEvent('MouseEvent');
            evt.initMouseEvent(name, !0, !0, window, 0, 0, 0, x, y, !1, !1, !1, !1, 0, null);
            evt.dataTransfer = dataTransfer;
            target.dispatchEvent(evt);
          });
    
          setTimeout(function () { document.body.removeChild(input); }, 25);
        };
        document.body.appendChild(input);
        return input;
    """
    driver = drop_target.parent
    file_input = driver.execute_script(JS_DROP_FILE, drop_target, 0, 0)
    file_input.send_keys(path)