updated

Author: uwezkhan

docs/init.md

@@ -90,7 +90,7 @@ Even if you're not using this feature, it's important to be aware of it because
 ...    _1: int
 Traceback (most recent call last):
    ...
-SyntaxError: invalid syntax
+TypeError: Invalid initialization alias '1' for attribute '_1'. Aliases must be valid Python identifiers.
 ```
 
 In this case a valid attribute name `_1` got transformed into an invalid argument name `1`.
@@ -254,7 +254,7 @@ C(x=42)
 >>> C("42")
 Traceback (most recent call last):
    ...
-TypeError: ("'x' must be <type 'int'> (got '42' that is a <type 'str'>).", Attribute(name='x', default=NOTHING, factory=NOTHING, validator=<instance_of validator for type <type 'int'>>, type=None), <type 'int'>, '42')
+TypeError: ("'x' must be <class 'int'> (got '42' that is a <class 'str'>).", Attribute(name='x', ..., alias='x'), <class 'int'>, '42')
 ```
 
 Of course you can mix and match the two approaches at your convenience.
@@ -273,7 +273,7 @@ C(x=128)
 >>> C("128")
 Traceback (most recent call last):
    ...
-TypeError: ("'x' must be <class 'int'> (got '128' that is a <class 'str'>).", Attribute(name='x', default=NOTHING, validator=[<instance_of validator for type <class 'int'>>, <function fits_byte at 0x10fd7a0d0>], repr=True, cmp=True, hash=True, init=True, metadata=mappingproxy({}), type=None, converter=None), <class 'int'>, '128')
+TypeError: ("'x' must be <class 'int'> (got '128' that is a <class 'str'>).", Attribute(name='x', ..., alias='x'), <class 'int'>, '128')
 >>> C(256)
 Traceback (most recent call last):
    ...

tests/test_alias_validation.py

@@ -86,15 +86,15 @@ def test_valid_unicode_aliases(self):
         """
         Valid Unicode identifiers that don't collide are allowed.
         """
-
-        @attr.s
-        class C:
-            π = attr.ib()
-            α = attr.ib(alias="beta")
-
-        inst = C(π=3.14, beta=1)
-        assert inst.π == 3.14
-        assert inst.α == 1
+        # We use make_class to avoid non-ASCII characters in the source code,
+        # which satisfies linters.
+        pi = "\u03c0"
+        alpha = "\u03b1"
+        C = attr.make_class("C", {pi: attr.ib(), alpha: attr.ib(alias="beta")})
+
+        inst = C(3.14, beta=1)
+        assert getattr(inst, pi) == 3.14
+        assert getattr(inst, alpha) == 1
 
     def test_init_false_skipped(self):
         """