[Python] Selenium cannot find Chrome binary

I am using a mac and have python 3 and selenuim 4.10 installed. I cannot work out what I am doing wrong . It was my understanding that from v4.6.0 or higher, you don't have to use a third party library such as WebDriverManager

Below is the python code

from selenium import webdriver
driver = webdriver.Chrome()
driver.get("myUrl")


and this is the error mnessage

selenium.common.exceptions.WebDriverException: Message: unknown error: cannot find Chrome binary


Any suggestions?

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