Merge pull request #2320 from jschueller/py32

Drop support for Python 3.2

.github/workflows/ci.yml

@@ -111,10 +111,6 @@ jobs:
           VER: '8.1'
         - SWIGLANG: python
           PY2: 2
-        - SWIGLANG: python
-          VER: '3.2'
-          os: ubuntu-18.04 # Python < 3.5 not available for 20.04.
-          continue-on-error: true # broken packages problem
         - SWIGLANG: python
           VER: '3.3'
           os: ubuntu-18.04 # Python < 3.5 not available for 20.04.

CHANGES.current

@@ -7,6 +7,9 @@ the issue number to the end of the URL: https://github.com/swig/swig/issues/
 Version 4.1.0 (in progress)
 ===========================
 
+2022-07-19: jschueller
+	    [Python] #2314 Drop support for Python 3.2.
+
 2022-07-19: olly
 	    Remove remaining support code for classic macos, which has not been
 	    supported by Apple for over 20 years now.

Doc/Manual/Python.html

@@ -156,9 +156,8 @@
 
 <p>
 This chapter describes SWIG's support of Python.  SWIG is compatible
-with all recent Python versions (Python 2.7 and Python &gt;= 3.2).  If you
+with all recent Python versions (Python 2.7 and Python &gt;= 3.3).  SWIG 4.0.x
-still need to generate bindings which work with older versions of Python,
+supported Python 3.2.  SWIG 3.0.x supported older Python 2.x and 3.x.
-you'll have to use SWIG 3.0.x.
 </p>
 
 <p>

Examples/python/import_packages/module_is_init/runme.py

@@ -5,14 +5,6 @@ import sys
 testname = os.path.basename(os.path.dirname(os.path.abspath(__file__)))
 print("Testing " + testname + " - module renamed as __init__.py")
 
-if sys.version_info >= (3, 0, 0) and sys.version_info < (3, 3, 0):
-    print("  Not importing as Python version is >= 3.0 and < 3.3")
-    # Package detection does not work in these versions.
-    # Can be fixed by using this in the interface file:
-    #   %module(moduleimport="from . import $module") foo   # without -builtin
-    #   %module(moduleimport="from .$module import *") foo  # with -builtin
-    sys.exit(0)
-
 import pkg1
 print("  Finished importing pkg1")
 

Lib/python/pyerrors.swg

@@ -64,7 +64,6 @@ SWIG_Python_AddErrorMsg(const char* mesg)
       PyErr_Format(type, "%s %s", tmp, mesg);
     else
       PyErr_Format(type, "%s", mesg);
-    SWIG_Python_str_DelForPy3(tmp);
     Py_DECREF(old_str);
     Py_DECREF(value);
   } else {

Lib/python/pyhead.swg

@@ -30,38 +30,19 @@
 #endif
 
 
-/* Warning: This function will allocate a new string in Python 3,
- * so please call SWIG_Python_str_DelForPy3(x) to free the space.
- */
 SWIGINTERN char*
 SWIG_Python_str_AsChar(PyObject *str)
 {
 #if PY_VERSION_HEX >= 0x03030000
   return (char *)PyUnicode_AsUTF8(str);
-#elif PY_VERSION_HEX >= 0x03000000
-  char *newstr = 0;
-  str = PyUnicode_AsUTF8String(str);
-  if (str) {
-    char *cstr;
-    Py_ssize_t len;
-    if (PyBytes_AsStringAndSize(str, &cstr, &len) != -1) {
-      newstr = (char *) malloc(len+1);
-      if (newstr)
-        memcpy(newstr, cstr, len+1);
-    }
-    Py_XDECREF(str);
-  }
-  return newstr;
 #else
   return PyString_AsString(str);
 #endif
 }
 
-#if PY_VERSION_HEX >= 0x03030000 || PY_VERSION_HEX < 0x03000000
+/* Was useful for Python 3.0.x-3.2.x - now provided only for compatibility
+ * with any uses in user interface files. */
 #define SWIG_Python_str_DelForPy3(x)
-#else
-#  define SWIG_Python_str_DelForPy3(x) free( (void*) (x) )
-#endif
 
 
 SWIGINTERN PyObject*

Lib/python/pyrun.swg

@@ -11,8 +11,8 @@
 # error "This version of SWIG only supports Python >= 2.7"
 #endif
 
-#if PY_VERSION_HEX >= 0x03000000 && PY_VERSION_HEX < 0x03020000
+#if PY_VERSION_HEX >= 0x03000000 && PY_VERSION_HEX < 0x03030000
-# error "This version of SWIG only supports Python 3 >= 3.2"
+# error "This version of SWIG only supports Python 3 >= 3.3"
 #endif
 
 /* Common SWIG API */
@@ -1758,7 +1758,6 @@ SWIG_Python_AddErrMesg(const char* mesg, int infront)
       } else {
 	PyErr_Format(type, "%s %s", errmesg, mesg);
       }
-      SWIG_Python_str_DelForPy3(tmp);
       Py_DECREF(old_str);
     }
     return 1;
@@ -1810,7 +1809,6 @@ SWIG_Python_TypeError(const char *type, PyObject *obj)
 	if (cstr) {
 	  PyErr_Format(PyExc_TypeError, "a '%s' is expected, '%s(%s)' is received",
 		       type, otype, cstr);
-          SWIG_Python_str_DelForPy3(cstr);
 	} else {
 	  PyErr_Format(PyExc_TypeError, "a '%s' is expected, '%s' is received",
 		       type, otype);

RELEASENOTES

@@ -11,6 +11,7 @@ SWIG-4.1.0 summary:
 - Add PHP 8 support.
 - PHP wrapping is now done entirely via PHP's C API - no more .php wrapper.
 - Perl 5.8.0 is now the oldest version SWIG supports.
+- Python 3.3 is now the oldest Python 3 version SWIG supports.
 - Common cases of `<` and `>` comparisons in constant expressions are now
   supported.
 - GitHub Actions is now used instead of Travis CI for continuous integration.