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+******
+wrap()
+******
+
+Purpose
+=======
+
+wrap(str, wrapper_str)
+wrap(str, wrapper_str, escaper_str)
+
+Returns the str wrapped with wrapper_str.
+In the second syntax additionally, any instances of wrapper_str appearing
+in str would be replaced by the escaper_str.
+
+
+Example
+=======
+
+Syntax 1
+--------
+
+The following example shows how the string is wrapped into
+the wrapper_string.
+
+.. code-block:: none
+
+   wrap("foo bar", "##")
+
+produces
+
+.. code-block:: none
+
+   "##foo bar##"
+
+
+Syntax 2
+--------
+
+This example shows how parts of the string are being replaced.
+
+.. code-block:: none
+
+   wrap("foo'bar", "'", "_")
+
+produces
+
+.. code-block:: none
+
+   "'foo_bar'"
+
+