adjust to changes in registry

pandas/core/arrays/integer.py

@@ -30,38 +30,21 @@ class IntegerDtype(ExtensionDtype):
 
     @classmethod
     def construct_from_string(cls, string):
-        if string == cls.name:
-            return cls()
-        else:
-            raise TypeError("Cannot construct a '{}' from "
-                            "'{}'".format(cls, string))
-
-    @classmethod
-    def construct_from_string_strict(cls, string):
         """
-        Strict construction from a string, raise a TypeError if not
+        Construction from a string, raise a TypeError if not
         possible
         """
-        if string[0] == 'I':
-            return cls.construct_from_string(string)
-        raise TypeError("could not construct PeriodDtype")
+        if string == cls.name:
+            return cls()
+        raise TypeError("Cannot construct a '{}' from "
+                        "'{}'".format(cls, string))
 
 
 class UnsignedIntegerDtype(IntegerDtype):
     kind = 'u'
     is_signed_integer = False
     is_unsigned_integer = True
 
-    @classmethod
-    def construct_from_string_strict(cls, string):
-        """
-        Strict construction from a string, raise a TypeError if not
-        possible
-        """
-        if string[0] == 'U':
-            return cls.construct_from_string(string)
-        raise TypeError("could not construct PeriodDtype")
-
 
 def to_integer_array(values):
     """
@@ -457,7 +440,7 @@ class UnsignedIntegerArray(IntegerArray):
         setattr(module, classname, dtype_type)
 
         # register
-        registry.register(dtype_type, dtype_type.construct_from_string_strict)
+        registry.register(dtype_type)
 
 
 # create the Array