Eliminate sprintf in generated python code

Newer clang versions emit warnings in generated code:
```
warning: 'sprintf' is deprecated: This function is provided for compatibility reasons only.  Due to security concerns inherent in the design of sprintf(3), it is highly recommended that you use snprintf(3) instead. [-Wdeprecated-declarations]
```

1 files changed, 3 insertions, 3 deletions

diff --git a/Lib/python/pycontainer.swg b/Lib/python/pycontainer.swg
index d6fdff087..4910fecc0 100644
--- a/Lib/python/pycontainer.swg
+++ b/Lib/python/pycontainer.swg
@@ -386,7 +386,7 @@ namespace swig {
         size_t replacecount = (jj - ii + step - 1) / step;
         if (is.size() != replacecount) {
           char msg[1024];
-          sprintf(msg, "attempt to assign sequence of size %lu to extended slice of size %lu", (unsigned long)is.size(), (unsigned long)replacecount);
+          PyOS_snprintf(msg, sizeof(msg), "attempt to assign sequence of size %lu to extended slice of size %lu", (unsigned long)is.size(), (unsigned long)replacecount);
           throw std::invalid_argument(msg);
         }
         typename Sequence::const_iterator isit = is.begin();
@@ -402,7 +402,7 @@ namespace swig {
       size_t replacecount = (ii - jj - step - 1) / -step;
       if (is.size() != replacecount) {
         char msg[1024];
-        sprintf(msg, "attempt to assign sequence of size %lu to extended slice of size %lu", (unsigned long)is.size(), (unsigned long)replacecount);
+        PyOS_snprintf(msg, sizeof(msg), "attempt to assign sequence of size %lu to extended slice of size %lu", (unsigned long)is.size(), (unsigned long)replacecount);
         throw std::invalid_argument(msg);
       }
       typename Sequence::const_iterator isit = is.begin();
@@ -478,7 +478,7 @@ namespace swig
 	return swig::as<T>(item);
       } catch (const std::invalid_argument& e) {
 	char msg[1024];
-	sprintf(msg, "in sequence element %d ", (int)_index);
+	PyOS_snprintf(msg, sizeof(msg), "in sequence element %d ", (int)_index);
 	if (!PyErr_Occurred()) {
 	  ::%type_error(swig::type_name<T>());
 	}