remove allow_setting from cache_readonly

Author: jorisvandenbossche

pandas/_libs/properties.pyx

@@ -9,20 +9,12 @@ from cpython cimport (
 cdef class CachedProperty(object):
 
     cdef readonly:
-        object func, name, __doc__, allow_setting
+        object func, name, __doc__
 
-    def __init__(self, func=None, allow_setting=False):
-        if func is not None:
-            self.func = func
-            self.name = func.__name__
-            self.__doc__ = getattr(func, '__doc__', None)
-        self.allow_setting = allow_setting
-
-    def __call__(self, func, doc=None):
+    def __init__(self, func):
         self.func = func
         self.name = func.__name__
         self.__doc__ = getattr(func, '__doc__', None)
-        return self
 
     def __get__(self, obj, typ):
         # Get the cache or set a default one if needed
@@ -42,21 +34,6 @@ cdef class CachedProperty(object):
             PyDict_SetItem(cache, self.name, val)
         return val
 
-    def __set__(self, obj, value):
-
-        if not self.allow_setting:
-            raise Exception("cannot set values for [%s]" % self.name)
-
-        # Get the cache or set a default one if needed
-        cache = getattr(obj, '_cache', None)
-        if cache is None:
-            try:
-                cache = obj._cache = {}
-            except (AttributeError):
-                return
-
-        PyDict_SetItem(cache, self.name, value)
-
 
 cache_readonly = CachedProperty
 

pandas/core/indexes/base.py

@@ -1401,7 +1401,7 @@ def _is_strictly_monotonic_decreasing(self):
     def is_lexsorted_for_tuple(self, tup):
         return True
 
-    @cache_readonly(allow_setting=True)
+    @cache_readonly
     def is_unique(self):
         """ return if the index has unique values """
         return self._engine.is_unique