Issue #27895: Spelling fixes (Contributed by Ville Skyttä).

Modules/_ctypes/ctypes.h

@@ -238,7 +238,7 @@ typedef struct {
  StgDictObject function to a generic one.
 
  Currently, PyCFuncPtr types have 'converters' and 'checker' entries in their
- type dict.  They are only used to cache attributes from other entries, whihc
+ type dict.  They are only used to cache attributes from other entries, which
  is wrong.
 
  One use case is the .value attribute that all simple types have.  But some

Modules/_hashopenssl.c

@@ -724,7 +724,7 @@ generate_hash_name_list(void)
 /*
  *  This macro generates constructor function definitions for specific
  *  hash algorithms.  These constructors are much faster than calling
- *  the generic one passing it a python string and are noticably
+ *  the generic one passing it a python string and are noticeably
  *  faster than calling a python new() wrapper.  Thats important for
  *  code that wants to make hashes of a bunch of small strings.
  */

Modules/_io/iobase.c

@@ -90,7 +90,7 @@ iobase_unsupported(const char *message)
     return NULL;
 }
 
-/* Positionning */
+/* Positioning */
 
 PyDoc_STRVAR(iobase_seek_doc,
     "Change stream position.\n"

Modules/_pickle.c

@@ -2131,7 +2131,7 @@ raw_unicode_escape(PyObject *obj)
         Py_UCS4 ch = PyUnicode_READ(kind, data, i);
         /* Map 32-bit characters to '\Uxxxxxxxx' */
         if (ch >= 0x10000) {
-            /* -1: substract 1 preallocated byte */
+            /* -1: subtract 1 preallocated byte */
             p = _PyBytesWriter_Prepare(&writer, p, 10-1);
             if (p == NULL)
                 goto error;
@@ -2149,7 +2149,7 @@ raw_unicode_escape(PyObject *obj)
         }
         /* Map 16-bit characters, '\\' and '\n' to '\uxxxx' */
         else if (ch >= 256 || ch == '\\' || ch == '\n') {
-            /* -1: substract 1 preallocated byte */
+            /* -1: subtract 1 preallocated byte */
             p = _PyBytesWriter_Prepare(&writer, p, 6-1);
             if (p == NULL)
                 goto error;

Modules/_testcapimodule.c

@@ -3798,7 +3798,7 @@ get_recursion_depth(PyObject *self, PyObject *args)
 {
     PyThreadState *tstate = PyThreadState_GET();
 
-    /* substract one to ignore the frame of the get_recursion_depth() call */
+    /* subtract one to ignore the frame of the get_recursion_depth() call */
     return PyLong_FromLong(tstate->recursion_depth - 1);
 }
 

Modules/_threadmodule.c

@@ -45,7 +45,7 @@ lock_dealloc(lockobject *self)
 /* Helper to acquire an interruptible lock with a timeout.  If the lock acquire
  * is interrupted, signal handlers are run, and if they raise an exception,
  * PY_LOCK_INTR is returned.  Otherwise, PY_LOCK_ACQUIRED or PY_LOCK_FAILURE
- * are returned, depending on whether the lock can be acquired withing the
+ * are returned, depending on whether the lock can be acquired within the
  * timeout.
  */
 static PyLockStatus

Modules/_tracemalloc.c

@@ -716,7 +716,7 @@ tracemalloc_realloc(void *ctx, void *ptr, size_t new_size)
 
         if (ADD_TRACE(ptr2, new_size) < 0) {
             /* Memory allocation failed. The error cannot be reported to
-               the caller, because realloc() may already have shrinked the
+               the caller, because realloc() may already have shrunk the
                memory block and so removed bytes.
 
                This case is very unlikely: a hash entry has just been

Modules/binascii.c

@@ -837,7 +837,7 @@ binascii_rledecode_hqx_impl(PyObject *module, Py_buffer *data)
     if (in_byte == RUNCHAR) {
         INBYTE(in_repeat);
         /* only 1 byte will be written, but 2 bytes were preallocated:
-           substract 1 byte to prevent overallocation */
+           subtract 1 byte to prevent overallocation */
         writer.min_size--;
 
         if (in_repeat != 0) {
@@ -858,7 +858,7 @@ binascii_rledecode_hqx_impl(PyObject *module, Py_buffer *data)
         if (in_byte == RUNCHAR) {
             INBYTE(in_repeat);
             /* only 1 byte will be written, but 2 bytes were preallocated:
-               substract 1 byte to prevent overallocation */
+               subtract 1 byte to prevent overallocation */
             writer.min_size--;
 
             if ( in_repeat == 0 ) {

Modules/mathmodule.c

@@ -1274,7 +1274,7 @@ count_set_bits(unsigned long n)
 
 /* Divide-and-conquer factorial algorithm
  *
- * Based on the formula and psuedo-code provided at:
+ * Based on the formula and pseudo-code provided at:
  * http://www.luschny.de/math/factorial/binarysplitfact.html
  *
  * Faster algorithms exist, but they're more complicated and depend on

Modules/socketmodule.c

@@ -6611,7 +6611,7 @@ PyInit__socket(void)
     PyModule_AddIntConstant(m, "SOMAXCONN", 5); /* Common value */
 #endif
 
-    /* Ancilliary message types */
+    /* Ancillary message types */
 #ifdef  SCM_RIGHTS
     PyModule_AddIntMacro(m, SCM_RIGHTS);
 #endif

Modules/zipimport.c

@@ -1315,7 +1315,7 @@ unmarshal_code(PyObject *pathname, PyObject *data, time_t mtime)
     return code;
 }
 
-/* Replace any occurances of "\r\n?" in the input string with "\n".
+/* Replace any occurrences of "\r\n?" in the input string with "\n".
    This converts DOS and Mac line endings to Unix line endings.
    Also append a trailing "\n" to be compatible with
    PyParser_SimpleParseFile(). Returns a new reference. */