Setting an unusable password on an existing user

Hi,

Is there any way to set the password of an existing user to and unusable value like none?

I tried user.set_unusable_password() and subsequently user.save() but this did not work.

Other than using this method is there a way to set the password to None or such like so that the user.has_usable_password() method will return False instead of True?

Many Thanks,
nav

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