Install Selenium and the appropriate Chrome driver for your Mac using conda.

mac_selenium_install.py

import requests
import re
import plistlib

# Find the available Chrome Drivers
url = "https://pypi.org/project/chromedriver-binary/#history"
html = requests.get(url).text
available = re.findall("\/project\/chromedriver-binary\/(.*?)\/", html)
available = [i for i in available if i.count(".") > 2]

# See what version of Chrome you have
plistloc = "/Applications/Google Chrome.app/Contents/Info.plist"
with open(plistloc, "rb") as infile:
    pl = plistlib.load(infile)
version = pl["CFBundleShortVersionString"] + ".0"


def first3(string):
    return "".join(string.split(".")[:3])


def find_version(item, available):
    for item in available:
        if first3(item) == first3(version):
            return item
    return "No Match"


# Find an available driver version close to your install version
best_fit = find_version(item, available)


print("Your Chrome Version: %s" % version)
print("Installing the closest driver version: %s" % best_fit)

# Install that version
%conda install -c conda-forge selenium python-chromedriver-binary==$best_fit

# Confirm that it works
from selenium import webdriver
import chromedriver_binary


driver = webdriver.Chrome()
driver.get('http://www.google.com')