Rename the extension registry variables to have leading underscores --
this clarifies that they are part of an internal API (albeit shared
between pickle.py, copy_reg.py and cPickle.c).
I'd like to do the same for copy_reg.dispatch_table, but worry that it
might be used by existing code. This risk doesn't exist for the
extension registry.
diff --git a/Lib/copy_reg.py b/Lib/copy_reg.py
index 8099403..e35d95e 100644
--- a/Lib/copy_reg.py
+++ b/Lib/copy_reg.py
@@ -78,9 +78,9 @@
# don't have this restriction.) Codes are positive ints; 0 is
# reserved.
-extension_registry = {} # key -> code
-inverted_registry = {} # code -> key
-extension_cache = {} # code -> object
+_extension_registry = {} # key -> code
+_inverted_registry = {} # code -> key
+_extension_cache = {} # code -> object
# Don't ever rebind those names: cPickle grabs a reference to them when
# it's initialized, and won't see a rebinding.
@@ -90,32 +90,32 @@
if not 1 <= code < 0x7fffffff:
raise ValueError, "code out of range"
key = (module, name)
- if (extension_registry.get(key) == code and
- inverted_registry.get(code) == key):
+ if (_extension_registry.get(key) == code and
+ _inverted_registry.get(code) == key):
return # Redundant registrations are benign
- if key in extension_registry:
+ if key in _extension_registry:
raise ValueError("key %s is already registered with code %s" %
- (key, extension_registry[key]))
- if code in inverted_registry:
+ (key, _extension_registry[key]))
+ if code in _inverted_registry:
raise ValueError("code %s is already in use for key %s" %
- (code, inverted_registry[code]))
- extension_registry[key] = code
- inverted_registry[code] = key
+ (code, _inverted_registry[code]))
+ _extension_registry[key] = code
+ _inverted_registry[code] = key
def remove_extension(module, name, code):
"""Unregister an extension code. For testing only."""
key = (module, name)
- if (extension_registry.get(key) != code or
- inverted_registry.get(code) != key):
+ if (_extension_registry.get(key) != code or
+ _inverted_registry.get(code) != key):
raise ValueError("key %s is not registered with code %s" %
(key, code))
- del extension_registry[key]
- del inverted_registry[code]
- if code in extension_cache:
- del extension_cache[code]
+ del _extension_registry[key]
+ del _inverted_registry[code]
+ if code in _extension_cache:
+ del _extension_cache[code]
def clear_extension_cache():
- extension_cache.clear()
+ _extension_cache.clear()
# Standard extension code assignments
diff --git a/Lib/pickle.py b/Lib/pickle.py
index 870d94d..35ab91b 100644
--- a/Lib/pickle.py
+++ b/Lib/pickle.py
@@ -28,7 +28,7 @@
from types import *
from copy_reg import dispatch_table, _reconstructor
-from copy_reg import extension_registry, inverted_registry, extension_cache
+from copy_reg import _extension_registry, _inverted_registry, _extension_cache
import marshal
import sys
import struct
@@ -845,7 +845,7 @@
(obj, module, name))
if self.proto >= 2:
- code = extension_registry.get((module, name))
+ code = _extension_registry.get((module, name))
if code:
assert code > 0
if code <= 0xff:
@@ -1238,15 +1238,15 @@
def get_extension(self, code):
nil = []
- obj = extension_cache.get(code, nil)
+ obj = _extension_cache.get(code, nil)
if obj is not nil:
self.append(obj)
return
- key = inverted_registry.get(code)
+ key = _inverted_registry.get(code)
if not key:
raise ValueError("unregistered extension code %d" % code)
obj = self.find_class(*key)
- extension_cache[code] = obj
+ _extension_cache[code] = obj
self.append(obj)
def find_class(self, module, name):