reorder_wifi_alt.py

#!/usr/bin/python

# As written, this requires the following:
# - OS X 10.6+ (may not work in 10.10, haven't tested)
# - python 2.6 or 2.7 (for collections.namedtuple usage, should be fine as default python in 10.6 is 2.6)
# - pyObjC (as such, recommended to be used with native OS X python install)

# Only tested and confirmed to work against 10.9.5
# Run with root

import objc, ctypes.util, os.path, collections
from Foundation import NSOrderedSet

preferred_SSID    = 'This SSID Should Be First'
next_to_last_SSID = 'This SSID Should Be Next To Last'
last_SSID         = 'This SSID Should be Last'

def load_objc_framework(framework_name):
    # Utility function that loads a Framework bundle and creates a namedtuple where the attributes are the loaded classes from the Framework bundle
    loaded_classes = dict()
    framework_bundle = objc.loadBundle(framework_name, bundle_path=os.path.dirname(ctypes.util.find_library(framework_name)), module_globals=loaded_classes)
    return collections.namedtuple('AttributedFramework', loaded_classes.keys())(**loaded_classes)

# Load the CoreWLAN.framework (10.6+)
CoreWLAN = load_objc_framework('CoreWLAN')

# Load all available wifi interfaces
interfaces = dict()
for i in CoreWLAN.CWInterface.interfaceNames():
    interfaces[i] = CoreWLAN.CWInterface.interfaceWithName_(i)

# Repeat the configuration with every wifi interface
for i in interfaces.keys():
    # Grab a mutable copy of this interface's configuration
    configuration_copy = CoreWLAN.CWMutableConfiguration.alloc().initWithConfiguration_(interfaces[i].configuration())
    # Find all the preferred/remembered network profiles
    profiles = list(configuration_copy.networkProfiles())
    # Grab all the SSIDs, in order
    SSIDs = [x.ssid() for x in profiles]
    # Check to see if our preferred SSID is in the list
    if (preferred_SSID in SSIDs):
        # Apparently it is, so let's adjust the order
        # Profiles with matching SSIDs will move to the front, the rest will remain at the end
        # Order is preserved, example where 'ssid3' is preferred:
        #    Original: [ssid1, ssid2, ssid3, ssid4]
        #   New order: [ssid3, ssid1, ssid2, ssid4]
        profiles.sort(key=lambda x: x.ssid() == preferred_SSID, reverse=True)
        # Now we move next_to_last_SSID to the end
        profiles.sort(key=lambda x: x.ssid() == next_to_last_SSID, reverse=False)
        # Now we move last_SSID to the end (bumping next_to_last_SSID)
        profiles.sort(key=lambda x: x.ssid() == last_SSID, reverse=False)
        # Now we have to update the mutable configuration
        # First convert it back to a NSOrderedSet
        profile_set = NSOrderedSet.orderedSetWithArray_(profiles)
        # Then set/overwrite the configuration copy's networkProfiles
        configuration_copy.setNetworkProfiles_(profile_set)
        # Then update the network interface configuration
        result = interfaces[i].commitConfiguration_authorization_error_(configuration_copy, None, None)

@skoobasteeve Works fine on Ventura here! Thank you
See further down

@jstaubr (CC: @skoobasteeve )
How did you manage to make it work on Ventura?
It works great on Monterey but on Ventura there were no change in the Preferred Network's list as I tested.
(It seems they deprecated the function. There's no UI either at System Preferences/Wi-Fi's to change the order of the networks. Only "Known Networks" window. )

Has anybody found a workaround for that?

@daydreamheart I'm sorry to inform you that Apple has "automated" the preferred wifi SSID choice in Ventura. It's not likely this will work going forward.https://support.apple.com/en-us/HT202831

@daydreamheart

Unfortunately @franton is right. I thought it was working because I was on the same network that I tried to make preferred and my CLI check returned the correct SSID.
I found out later last week that Ventura always returns the currently connected SSID as top of the preferred list via
networksetup -listpreferredwirelessnetworks en0

Well it was good while it lasted! At least in their new system they indicate that EAP networks get priority over WPA. Just wish we could retain some control.

Maybe some feedback to Apple is in order?