[Python-checkins] [3.9] bpo-45060: Get rid of few uses of the equality operators with None (GH-28087). (GH-28093)

[serhiy-storchaka]

https://github.com/python/cpython/commit/e09dd8aafd6f9aef03945c417267806d47084a5d
commit: e09dd8aafd6f9aef03945c417267806d47084a5d
branch: 3.9
author: Serhiy Storchaka <storchaka at gmail.com>
committer: serhiy-storchaka <storchaka at gmail.com>
date: 2021-09-01T09:51:01+03:00
summary:

[3.9] bpo-45060: Get rid of few uses of the equality operators with None (GH-28087). (GH-28093)

(cherry picked from commit 3c65457156d87e55010507d616b4eecb7a02883d)

Co-authored-by: Serhiy Storchaka <storchaka at gmail.com>

files:
M Doc/library/dbm.rst
M Lib/ctypes/_aix.py
M Lib/email/contentmanager.py
M Lib/test/datetimetester.py
M Modules/_gdbmmodule.c
M Modules/clinic/_gdbmmodule.c.h
M Tools/clinic/clinic.py

diff --git a/Doc/library/dbm.rst b/Doc/library/dbm.rst
index 57ae547b833cc..ff01ae90f6425 100644
--- a/Doc/library/dbm.rst
+++ b/Doc/library/dbm.rst
@@ -216,7 +216,7 @@ supported.
       contains them all::
 
          k = db.firstkey()
-         while k != None:
+         while k is not None:
              print(k)
              k = db.nextkey(k)
 
diff --git a/Lib/ctypes/_aix.py b/Lib/ctypes/_aix.py
index 190cac6507ede..26959d90a4dd6 100644
--- a/Lib/ctypes/_aix.py
+++ b/Lib/ctypes/_aix.py
@@ -282,7 +282,7 @@ def find_shared(paths, name):
         if path.exists(archive):
             members = get_shared(get_ld_headers(archive))
             member = get_member(re.escape(name), members)
-            if member != None:
+            if member is not None:
                 return (base, member)
             else:
                 return (None, None)
@@ -307,7 +307,7 @@ def find_library(name):
 
     libpaths = get_libpaths()
     (base, member) = find_shared(libpaths, name)
-    if base != None:
+    if base is not None:
         return f"{base}({member})"
 
     # To get here, a member in an archive has not been found
diff --git a/Lib/email/contentmanager.py b/Lib/email/contentmanager.py
index 3cf62dc8621cd..fcf278dbccbac 100644
--- a/Lib/email/contentmanager.py
+++ b/Lib/email/contentmanager.py
@@ -144,7 +144,7 @@ def _encode_text(string, charset, cte, policy):
     linesep = policy.linesep.encode('ascii')
     def embedded_body(lines): return linesep.join(lines) + linesep
     def normal_body(lines): return b'\n'.join(lines) + b'\n'
-    if cte==None:
+    if cte is None:
         # Use heuristics to decide on the "best" encoding.
         if max((len(x) for x in lines), default=0) <= policy.max_line_length:
             try:
diff --git a/Lib/test/datetimetester.py b/Lib/test/datetimetester.py
index a9c3a370e0e83..fcc13bfc59667 100644
--- a/Lib/test/datetimetester.py
+++ b/Lib/test/datetimetester.py
@@ -344,7 +344,7 @@ def test_comparison(self):
         with self.assertRaises(TypeError): timezone(ZERO) < timezone(ZERO)
         self.assertIn(timezone(ZERO), {timezone(ZERO)})
         self.assertTrue(timezone(ZERO) != None)
-        self.assertFalse(timezone(ZERO) ==  None)
+        self.assertFalse(timezone(ZERO) == None)
 
         tz = timezone(ZERO)
         self.assertTrue(tz == ALWAYS_EQ)
diff --git a/Modules/_gdbmmodule.c b/Modules/_gdbmmodule.c
index dd4c6b16f745c..16b0f792a1b4b 100644
--- a/Modules/_gdbmmodule.c
+++ b/Modules/_gdbmmodule.c
@@ -433,7 +433,7 @@ The following code prints every key in the database db, without having
 to create a list in memory that contains them all:
 
       k = db.firstkey()
-      while k != None:
+      while k is not None:
           print(k)
           k = db.nextkey(k)
 [clinic start generated code]*/
@@ -441,7 +441,7 @@ to create a list in memory that contains them all:
 static PyObject *
 _gdbm_gdbm_nextkey_impl(dbmobject *self, const char *key,
                         Py_ssize_clean_t key_length)
-/*[clinic end generated code: output=192ab892de6eb2f6 input=1f1606943614e36f]*/
+/*[clinic end generated code: output=192ab892de6eb2f6 input=b7b0949c520d730c]*/
 {
     PyObject *v;
     datum dbm_key, nextkey;
diff --git a/Modules/clinic/_gdbmmodule.c.h b/Modules/clinic/_gdbmmodule.c.h
index aa37a24d3b211..552bf6ed88e93 100644
--- a/Modules/clinic/_gdbmmodule.c.h
+++ b/Modules/clinic/_gdbmmodule.c.h
@@ -139,7 +139,7 @@ PyDoc_STRVAR(_gdbm_gdbm_nextkey__doc__,
 "to create a list in memory that contains them all:\n"
 "\n"
 "      k = db.firstkey()\n"
-"      while k != None:\n"
+"      while k is not None:\n"
 "          print(k)\n"
 "          k = db.nextkey(k)");
 
@@ -298,4 +298,4 @@ dbmopen(PyObject *module, PyObject *const *args, Py_ssize_t nargs)
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=2766471b2fa1a816 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=f48d6e8d4c8a3465 input=a9049054013a1b77]*/
diff --git a/Tools/clinic/clinic.py b/Tools/clinic/clinic.py
index 34b58079281b6..61d30b01c0998 100755
--- a/Tools/clinic/clinic.py
+++ b/Tools/clinic/clinic.py
@@ -1632,7 +1632,7 @@ def print_block(self, block):
         dsl_name = block.dsl_name
         write = self.f.write
 
-        assert not ((dsl_name == None) ^ (output == None)), "you must specify dsl_name and output together, dsl_name " + repr(dsl_name)
+        assert not ((dsl_name is None) ^ (output is None)), "you must specify dsl_name and output together, dsl_name " + repr(dsl_name)
 
         if not dsl_name:
             write(input)
@@ -2957,7 +2957,7 @@ def converter_init(self, *, accept={int}, type=None):
             self.format_unit = 'C'
         elif accept != {int}:
             fail("int_converter: illegal 'accept' argument " + repr(accept))
-        if type != None:
+        if type is not None:
             self.type = type
 
     def parse_arg(self, argname, displayname):