Issue #25523: Correct "a" article to "an" article

This changes the main documentation, doc strings, source code comments, and a
couple error messages in the test suite. In some cases the word was removed
or edited some other way to fix the grammar.

13 files changed, 26 insertions, 26 deletions

diff --git a/Modules/_ctypes/libffi/src/x86/darwin64.S b/Modules/_ctypes/libffi/src/x86/darwin64.S
index 2f7394e..0c72ed2 100644
--- a/Modules/_ctypes/libffi/src/x86/darwin64.S
+++ b/Modules/_ctypes/libffi/src/x86/darwin64.S
@@ -350,7 +350,7 @@ LASFDE1:
 	.set	L$set$3,LUW1-LUW0
 	.long	L$set$3
 
-	/* New stack frame based off rbp.  This is a itty bit of unwind
+	/* New stack frame based off rbp.  This is an itty bit of unwind
 	   trickery in that the CFA *has* changed.  There is no easy way
 	   to describe it correctly on entry to the function.  Fortunately,
 	   it doesn't matter too much since at all points we can correctly
diff --git a/Modules/_ctypes/libffi/src/x86/unix64.S b/Modules/_ctypes/libffi/src/x86/unix64.S
index dcd6bc7..45a0ed7 100644
--- a/Modules/_ctypes/libffi/src/x86/unix64.S
+++ b/Modules/_ctypes/libffi/src/x86/unix64.S
@@ -366,7 +366,7 @@ ffi_closure_unix64:
 	.byte	0x4			/* DW_CFA_advance_loc4 */
 	.long	.LUW1-.LUW0
 
-	/* New stack frame based off rbp.  This is a itty bit of unwind
+	/* New stack frame based off rbp.  This is an itty bit of unwind
 	   trickery in that the CFA *has* changed.  There is no easy way
 	   to describe it correctly on entry to the function.  Fortunately,
 	   it doesn't matter too much since at all points we can correctly
diff --git a/Modules/_ctypes/libffi_osx/x86/darwin64.S b/Modules/_ctypes/libffi_osx/x86/darwin64.S
index 165d469..1286d33 100644
--- a/Modules/_ctypes/libffi_osx/x86/darwin64.S
+++ b/Modules/_ctypes/libffi_osx/x86/darwin64.S
@@ -351,7 +351,7 @@ LASFDE1:
  .set  L$set$3,LUW1-LUW0
  .long L$set$3
 
- /* New stack frame based off rbp.  This is a itty bit of unwind
+ /* New stack frame based off rbp.  This is an itty bit of unwind
     trickery in that the CFA *has* changed.  There is no easy way
     to describe it correctly on entry to the function.  Fortunately,
     it doesn't matter too much since at all points we can correctly
diff --git a/Modules/_hashopenssl.c b/Modules/_hashopenssl.c
index d5dde6a..5b0a7be 100644
--- a/Modules/_hashopenssl.c
+++ b/Modules/_hashopenssl.c
@@ -706,7 +706,7 @@ _openssl_hash_name_mapper(const OBJ_NAME *openssl_obj_name, void *arg)
     if (openssl_obj_name == NULL)
         return;
     /* Ignore aliased names, they pollute the list and OpenSSL appears to
-     * have a its own definition of alias as the resulting list still
+     * have its own definition of alias as the resulting list still
      * contains duplicate and alternate names for several algorithms.     */
     if (openssl_obj_name->alias)
         return;
diff --git a/Modules/_io/_iomodule.c b/Modules/_io/_iomodule.c
index 45c31a5..44116d8 100644
--- a/Modules/_io/_iomodule.c
+++ b/Modules/_io/_iomodule.c
@@ -75,7 +75,7 @@ PyDoc_STRVAR(module_doc,
 "Another IOBase subclass, TextIOBase, deals with the encoding and decoding\n"
 "of streams into text. TextIOWrapper, which extends it, is a buffered text\n"
 "interface to a buffered raw stream (`BufferedIOBase`). Finally, StringIO\n"
-"is a in-memory stream for text.\n"
+"is an in-memory stream for text.\n"
 "\n"
 "Argument names are not part of the specification, and only the arguments\n"
 "of open() are intended to be used as keyword arguments.\n"
diff --git a/Modules/_io/textio.c b/Modules/_io/textio.c
index b419275..0c1b13e 100644
--- a/Modules/_io/textio.c
+++ b/Modules/_io/textio.c
@@ -931,8 +931,8 @@ textiowrapper_init(textio *self, PyObject *args, PyObject *kwds)
         if (self->encoding == NULL) {
           catch_ImportError:
             /*
-             Importing locale can raise a ImportError because of
-             _functools, and locale.getpreferredencoding can raise a
+             Importing locale can raise an ImportError because of
+             _functools, and locale.getpreferredencoding can raise an
              ImportError if _locale is not available.  These will happen
              during module building.
             */
diff --git a/Modules/_pickle.c b/Modules/_pickle.c
index 830479f..8a98f51 100644
--- a/Modules/_pickle.c
+++ b/Modules/_pickle.c
@@ -4032,7 +4032,7 @@ version of Python needed to read the pickle produced.
 
 The *file* argument must have a write() method that accepts a single
 bytes argument. It can thus be a file object opened for binary
-writing, a io.BytesIO instance, or any other custom object that meets
+writing, an io.BytesIO instance, or any other custom object that meets
 this interface.
 
 If *fix_imports* is True and protocol is less than 3, pickle will try
@@ -4042,7 +4042,7 @@ to map the new Python 3 names to the old module names used in Python
 
 static int
 _pickle_Pickler___init___impl(PicklerObject *self, PyObject *file, PyObject *protocol, int fix_imports)
-/*[clinic end generated code: output=56e229f3b1f4332f input=b8cdeb7e3f5ee674]*/
+/*[clinic end generated code: output=56e229f3b1f4332f input=4faabdbc763c2389]*/
 {
     _Py_IDENTIFIER(persistent_id);
     _Py_IDENTIFIER(dispatch_table);
@@ -6443,7 +6443,7 @@ representation are ignored.
 The argument *file* must have two methods, a read() method that takes
 an integer argument, and a readline() method that requires no
 arguments.  Both methods should return bytes.  Thus *file* can be a
-binary file object opened for reading, a io.BytesIO object, or any
+binary file object opened for reading, an io.BytesIO object, or any
 other custom object that meets this interface.
 
 Optional keyword arguments are *fix_imports*, *encoding* and *errors*,
@@ -6458,7 +6458,7 @@ string instances as bytes objects.
 
 static int
 _pickle_Unpickler___init___impl(UnpicklerObject *self, PyObject *file, int fix_imports, const char *encoding, const char *errors)
-/*[clinic end generated code: output=b9ed1d84d315f3b5 input=30b4dc9e976b890c]*/
+/*[clinic end generated code: output=b9ed1d84d315f3b5 input=04ece661aa884837]*/
 {
     _Py_IDENTIFIER(persistent_load);
 
@@ -6877,7 +6877,7 @@ version of Python needed to read the pickle produced.
 
 The *file* argument must have a write() method that accepts a single
 bytes argument.  It can thus be a file object opened for binary
-writing, a io.BytesIO instance, or any other custom object that meets
+writing, an io.BytesIO instance, or any other custom object that meets
 this interface.
 
 If *fix_imports* is True and protocol is less than 3, pickle will try
@@ -6887,7 +6887,7 @@ to map the new Python 3 names to the old module names used in Python
 
 static PyObject *
 _pickle_dump_impl(PyModuleDef *module, PyObject *obj, PyObject *file, PyObject *protocol, int fix_imports)
-/*[clinic end generated code: output=a606e626d553850d input=e9e5fdd48de92eae]*/
+/*[clinic end generated code: output=a606e626d553850d input=830f8a64cef6f042]*/
 {
     PicklerObject *pickler = _Pickler_New();
 
@@ -6985,7 +6985,7 @@ representation are ignored.
 The argument *file* must have two methods, a read() method that takes
 an integer argument, and a readline() method that requires no
 arguments.  Both methods should return bytes.  Thus *file* can be a
-binary file object opened for reading, a io.BytesIO object, or any
+binary file object opened for reading, an io.BytesIO object, or any
 other custom object that meets this interface.
 
 Optional keyword arguments are *fix_imports*, *encoding* and *errors*,
@@ -7000,7 +7000,7 @@ string instances as bytes objects.
 
 static PyObject *
 _pickle_load_impl(PyModuleDef *module, PyObject *file, int fix_imports, const char *encoding, const char *errors)
-/*[clinic end generated code: output=568c61356c172654 input=da97372e38e510a6]*/
+/*[clinic end generated code: output=568c61356c172654 input=2df7c7a1e6742204]*/
 {
     PyObject *result;
     UnpicklerObject *unpickler = _Unpickler_New();
diff --git a/Modules/atexitmodule.c b/Modules/atexitmodule.c
index 9887014..b9c344a 100644
--- a/Modules/atexitmodule.c
+++ b/Modules/atexitmodule.c
@@ -257,7 +257,7 @@ atexit_free(PyObject *m)
 PyDoc_STRVAR(atexit_unregister__doc__,
 "unregister(func) -> None\n\
 \n\
-Unregister a exit function which was previously registered using\n\
+Unregister an exit function which was previously registered using\n\
 atexit.register\n\
 \n\
     func - function to be unregistered");
diff --git a/Modules/audioop.c b/Modules/audioop.c
index 5efed0c..9a5d8c1 100644
--- a/Modules/audioop.c
+++ b/Modules/audioop.c
@@ -112,7 +112,7 @@ static PyInt16 _st_ulaw2linear16[256] = {
 
 /*
  * linear2ulaw() accepts a 14-bit signed integer and encodes it as u-law data
- * stored in a unsigned char.  This function should only be called with
+ * stored in an unsigned char.  This function should only be called with
  * the data shifted such that it only contains information in the lower
  * 14-bits.
  *
@@ -218,7 +218,7 @@ static PyInt16 _st_alaw2linear16[256] = {
 
 /*
  * linear2alaw() accepts an 13-bit signed integer and encodes it as A-law data
- * stored in a unsigned char.  This function should only be called with
+ * stored in an unsigned char.  This function should only be called with
  * the data shifted such that it only contains information in the lower
  * 13-bits.
  *
diff --git a/Modules/clinic/_pickle.c.h b/Modules/clinic/_pickle.c.h
index 975298c..c0c54d2 100644
--- a/Modules/clinic/_pickle.c.h
+++ b/Modules/clinic/_pickle.c.h
@@ -77,7 +77,7 @@ PyDoc_STRVAR(_pickle_Pickler___init____doc__,
 "\n"
 "The *file* argument must have a write() method that accepts a single\n"
 "bytes argument. It can thus be a file object opened for binary\n"
-"writing, a io.BytesIO instance, or any other custom object that meets\n"
+"writing, an io.BytesIO instance, or any other custom object that meets\n"
 "this interface.\n"
 "\n"
 "If *fix_imports* is True and protocol is less than 3, pickle will try\n"
@@ -258,7 +258,7 @@ PyDoc_STRVAR(_pickle_Unpickler___init____doc__,
 "The argument *file* must have two methods, a read() method that takes\n"
 "an integer argument, and a readline() method that requires no\n"
 "arguments.  Both methods should return bytes.  Thus *file* can be a\n"
-"binary file object opened for reading, a io.BytesIO object, or any\n"
+"binary file object opened for reading, an io.BytesIO object, or any\n"
 "other custom object that meets this interface.\n"
 "\n"
 "Optional keyword arguments are *fix_imports*, *encoding* and *errors*,\n"
@@ -366,7 +366,7 @@ PyDoc_STRVAR(_pickle_dump__doc__,
 "\n"
 "The *file* argument must have a write() method that accepts a single\n"
 "bytes argument.  It can thus be a file object opened for binary\n"
-"writing, a io.BytesIO instance, or any other custom object that meets\n"
+"writing, an io.BytesIO instance, or any other custom object that meets\n"
 "this interface.\n"
 "\n"
 "If *fix_imports* is True and protocol is less than 3, pickle will try\n"
@@ -459,7 +459,7 @@ PyDoc_STRVAR(_pickle_load__doc__,
 "The argument *file* must have two methods, a read() method that takes\n"
 "an integer argument, and a readline() method that requires no\n"
 "arguments.  Both methods should return bytes.  Thus *file* can be a\n"
-"binary file object opened for reading, a io.BytesIO object, or any\n"
+"binary file object opened for reading, an io.BytesIO object, or any\n"
 "other custom object that meets this interface.\n"
 "\n"
 "Optional keyword arguments are *fix_imports*, *encoding* and *errors*,\n"
@@ -542,4 +542,4 @@ _pickle_loads(PyModuleDef *module, PyObject *args, PyObject *kwargs)
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=3aba79576e240c62 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=1ba210152e2261d8 input=a9049054013a1b77]*/
diff --git a/Modules/expat/pyexpatns.h b/Modules/expat/pyexpatns.h
index 2f2f4f9..999c5c7 100644
--- a/Modules/expat/pyexpatns.h
+++ b/Modules/expat/pyexpatns.h
@@ -21,7 +21,7 @@
  *
  *
  * The Solution:
- * Prefix all a exported symbols with "PyExpat_". This is similar to
+ * Prefix all exported symbols with "PyExpat_". This is similar to
  * what Mozilla does for some common libs:
  * http://lxr.mozilla.org/seamonkey/source/modules/libimg/png/mozpngconf.h#115
  *
diff --git a/Modules/hashlib.h b/Modules/hashlib.h
index 51c68f6..3580453 100644
--- a/Modules/hashlib.h
+++ b/Modules/hashlib.h
@@ -30,7 +30,7 @@
 /*
  * Helper code to synchronize access to the hash object when the GIL is
  * released around a CPU consuming hashlib operation. All code paths that
- * access a mutable part of obj must be enclosed in a ENTER_HASHLIB /
+ * access a mutable part of obj must be enclosed in an ENTER_HASHLIB /
  * LEAVE_HASHLIB block or explicitly acquire and release the lock inside
  * a PY_BEGIN / END_ALLOW_THREADS block if they wish to release the GIL for
  * an operation.
diff --git a/Modules/readline.c b/Modules/readline.c
index ad51349..e9eabf5 100644
--- a/Modules/readline.c
+++ b/Modules/readline.c
@@ -1195,7 +1195,7 @@ call_readline(FILE *sys_stdin, FILE *sys_stdout, const char *prompt)
         return NULL;
     }
 
-    /* We got an EOF, return a empty string. */
+    /* We got an EOF, return an empty string. */
     if (p == NULL) {
         p = PyMem_RawMalloc(1);
         if (p != NULL)