additional custom password validator

rowers/validator.py

@@ -0,0 +1,23 @@
+from django.core.exceptions import ValidationError
+from django.utils.translation import gettext as _
+
+class LettersAndDigitsValidator:
+
+    def validate(self, password, user=None):
+        vals = {
+        'Password must contain an uppercase letter.': lambda s: any(x.isupper() for x in s),
+        'Password must contain a lowercase letter.': lambda s: any(x.islower() for x in s),
+        'Password must contain a digit.': lambda s: any(x.isdigit() for x in s),
+        'Password cannot contain white spaces.': lambda s: not any(x.isspace() for x in s)
+        }
+        valid = None
+        for n, val in vals.items():
+           if not val(password):
+               valid = False
+               raise ValidationError(n)
+        return valid
+
+    def get_help_text(self):
+        return _(
+            "Your password must contain an uppercase letter, a lowercase letter, and a digit"
+        )