Make assertion match message (pydantic#1533)

StephenBrown2 · web-flow · commit ba2cc5c5579d · 2020-05-31T14:57:37.000+01:00
diff --git a/docs/examples/validators_simple.py b/docs/examples/validators_simple.py
@@ -21,7 +21,7 @@ def passwords_match(cls, v, values, **kwargs):
 
     @validator('username')
     def username_alphanumeric(cls, v):
-        assert v.isalpha(), 'must be alphanumeric'
+        assert v.isalnum(), 'must be alphanumeric'
         return v
 
 
