Function is_installed

Lib/test/test_launcher.py:134–146

(tag)

def is_installed(tag):
    key = rf"Software\Python\PythonCore\{tag}\InstallPath"
    for root, flag in [
        (winreg.HKEY_CURRENT_USER, 0),
        (winreg.HKEY_LOCAL_MACHINE, winreg.KEY_WOW64_64KEY),
        (winreg.HKEY_LOCAL_MACHINE, winreg.KEY_WOW64_32KEY),
    ]:
        try:
            winreg.CloseKey(winreg.OpenKey(root, key, access=winreg.KEY_READ | flag))
            return True
        except OSError:
            pass
    return False


class PreservePyIni: