Selenium WebDriver: I want to overwrite value in field instead of appending to it with sendKeys using Java

You can also clear the field before sending it keys.

element.clear()
element.sendKeys("Some text here")

I think you can try to firstly select all the text in the field and then send the new sequence:

from selenium.webdriver.common.keys import Keys
element.sendKeys(Keys.chord(Keys.CONTROL, "a"), "55");

Okay, it is a few days ago... In my current case, the answer from ZloiAdun does not work for me, but brings me very close to my solution...

Instead of:

element.sendKeys(Keys.chord(Keys.CONTROL, "a"), "55");

the following code makes me happy:

element.sendKeys(Keys.HOME, Keys.chord(Keys.SHIFT, Keys.END), "55");

So I hope that helps somebody!