Prints all apps that are 32-bit only.

32-Bit Apps.py

#!/usr/bin/python

import subprocess
import plistlib

def get32BitApps():
    cmd = '/usr/sbin/system_profiler -xml SPApplicationsDataType'
    p = subprocess.Popen(cmd, shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    out, err = p.communicate()
    if p.returncode != 0:
        exit('Error: ' + err)
    plist = plistlib.readPlistFromString(out)
    foundApps = []
    apps = plist[0]['_items']
    for app in apps:
        if 'no' in app.get('has64BitIntelCode'):
            foundApps.append(app.get('path'))
    return foundApps 

if __name__ == '__main__':
    for app in get32BitApps():
        print app

/usr/bin/mdfind "kMDItemContentType == 'com.apple.application-bundle' && kMDItemExecutableArchitectures != '*x86_64*'"