Add py::exec() as a shortcut for py::eval<py::eval_statements>()

docs/advanced/pycpp/utilities.rst

@@ -24,16 +24,10 @@ expected in Python:
 Evaluating Python expressions from strings and files
 ====================================================
 
-pybind11 provides the :func:`eval` and :func:`eval_file` functions to evaluate
+pybind11 provides the `eval`, `exec` and `eval_file` functions to evaluate
 Python expressions and statements. The following example illustrates how they
 can be used.
 
-Both functions accept a template parameter that describes how the argument
-should be interpreted. Possible choices include ``eval_expr`` (isolated
-expression), ``eval_single_statement`` (a single statement, return value is
-always ``none``), and ``eval_statements`` (sequence of statements, return value
-is always ``none``).
-
 .. code-block:: cpp
 
     // At beginning of file
@@ -48,7 +42,7 @@ is always ``none``).
     int result = py::eval("my_variable + 10", scope).cast<int>();
 
     // Evaluate a sequence of statements
-    py::eval<py::eval_statements>(
+    py::exec(
         "print('Hello')\n"
         "print('world!');",
         scope);
@@ -62,7 +56,7 @@ the raw string delimiter ``R"(``, ensuring all lines have common leading indent:
 
 .. code-block:: cpp
 
-    py::eval<py::eval_statements>(R"(
+    py::exec(R"(
         x = get_answer()
         if x == 42:
             print('Hello World!')
@@ -70,3 +64,13 @@ the raw string delimiter ``R"(``, ensuring all lines have common leading indent:
             print('Bye!')
         )", scope
     );
+
+.. note::
+
+    `eval` and `eval_file` accept a template parameter that describes how the
+    string/file should be interpreted. Possible choices include ``eval_expr``
+    (isolated expression), ``eval_single_statement`` (a single statement, return
+    value is always ``none``), and ``eval_statements`` (sequence of statements,
+    return value is always ``none``). `eval` defaults to  ``eval_expr``,
+    `eval_file` defaults to ``eval_statements`` and `exec` is just a shortcut
+    for ``eval<eval_statements>``.