Q:

set proxy address with selenium chrome

How do I use a proxy IP with selenium chrome?
I've replicated the steps in this question and this question but cannot get chrome to use a new proxy. 
To replicate, choose any of the free IPs from this site then execute:
PROXY = "80.237.6.1:34880"
chrome_options = webdriver.ChromeOptions()
chrome_options.add_argument('--proxy-server=%s' % PROXY)

chrome = webdriver.Chrome(chrome_options=chrome_options)
chrome.get("https://www.whatismyip.com/my-ip-information/")

When chrome opens the wahtismyip.com page, the displayed IP is my own, not the proxy. 

A:

You have to set the capabilities and force it to use a manual proxy.
Username and password are optional.
PROXY should be in  the form of 'http://68.251.250.193:8080'
proxy = {'address': PROXY,
     'username': 'USERNAME',
     'password': 'PASSWORD'}

capabilities = dict()
capabilities['proxy'] = {'proxyType': 'MANUAL',
                         'httpProxy': proxy['address'],
                         'ftpProxy': proxy['address'],
                         'sslProxy': proxy['address'],
                         'noProxy': '',
                         'class': "org.openqa.selenium.Proxy",
                         'autodetect': False,
                         'socksUsername': proxy['username'],
                         'socksPassword': proxy['password']}

chrome = webdriver.Chrome(executable_path = 'C:\\Users\\whereveryourpathtochromedriveris',
                          chrome_options=chrome_options,
                          desired_capabilities=capabilities)
chrome.get("https://www.whatismyip.com/my-ip-information/")

