Django Model

Hello all.

I'm beginer. Sorry. Can anyone help me with this model. It did't work(TypeError: expected string or bytes-like object

):

import whois

class Domains(models.Model):
    domainname = models.CharField(max_length=200, blank=True)
    domainuser = models.ForeignKey(User, on_delete=models.CASCADE)
    details = whois.whois(domainname)
    w = str(details.expiration_date)
    domainwhois = models.DateField(default=w)

    def __str__(self):
        return self.domainname

Domains.save()

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