Make test_inspect _pickle requirements optional

Author: youknowone

Lib/test/test_inspect/test_inspect.py

@@ -13,7 +13,6 @@
 import os
 import dis
 from os.path import normcase
-import _pickle
 import pickle
 import shutil
 import stat
@@ -29,6 +28,12 @@
 import warnings
 import weakref
 
+try:
+    import _pickle
+    MISSING_C_PICKLE = False
+except ImportError:
+    MISSING_C_PICKLE = True
+
 
 try:
     from concurrent.futures import ThreadPoolExecutor
@@ -1410,6 +1415,7 @@ def test(): pass
 
     @unittest.skipIf(MISSING_C_DOCSTRINGS,
                      "Signature information for builtins requires docstrings")
+    @unittest.skipIf(MISSING_C_PICKLE, "requires _pickle")
     def test_getfullargspec_builtin_methods(self):
         self.assertFullArgSpecEquals(_pickle.Pickler.dump, ['self', 'obj'])
 
@@ -4635,6 +4641,7 @@ class D(C): pass
 
     @unittest.skipIf(MISSING_C_DOCSTRINGS,
                      "Signature information for builtins requires docstrings")
+    @unittest.skipIf(MISSING_C_PICKLE, "requires _pickle")
     def test_signature_on_builtin_class(self):
         expected = ('(file, protocol=None, fix_imports=True, '
                     'buffer_callback=None)')
@@ -5176,6 +5183,7 @@ class foo: pass
 
     @unittest.skipIf(MISSING_C_DOCSTRINGS,
                      "Signature information for builtins requires docstrings")
+    @unittest.skipIf(MISSING_C_PICKLE, "requires _pickle")
     def test_signature_from_callable_builtin_obj(self):
         class MySignature(inspect.Signature): pass
         sig = MySignature.from_callable(_pickle.Pickler)