Python3 script that lists all non-64bit apps on your mac

check64.py

"""
check64.py: python3 script that lists all apps that don't contain Intel 64bit
            code. Tested on macOS 10.13.3 with Python 3.6.4, no external deps
"""
import plistlib
import subprocess


if __name__ == "__main__":
    app_profile = subprocess.check_output(
        ["system_profiler", "SPApplicationsDataType", "-xml"])
    apps_info = plistlib.loads(app_profile)

    for app in apps_info[0]["_items"]:
        if app["has64BitIntelCode"] == "no":
            print("{} is not Intel 64bit ready ({})".format(
                app["_name"], app["path"], app["runtime_environment"]))