Added typestring parser checker

docs/source/contributing/documentation.rst

@@ -91,7 +91,7 @@ Example:
 
 See an example on list item 4.
 
-.. NOTE::
+.. note::
 
    When documenting varargs (args and kwargs), make sure to
    document them by listing the possible types of each value specified,
@@ -318,6 +318,24 @@ elements that are either a ``str`` or ``None``;
 ``(str, int)``; ``Tuple[:class:`int`, ...]`` for a tuple of variable
 length with only integers.
 
+.. note::
+   As a helper for tool for typesets, you can use ``typestring-parser`` which can 
+   be accessed by first downloading it via ``pip`` - ``pip install typestring-parser`` and
+   then using ``from typestring_parser import parse``.
+
+   Example::
+
+    from typestring_parser import parse
+
+    >>> parse('int')
+    <class 'int'>
+    >>> parse('int or str')
+    typing.Union[int, str]
+    >>> parse('list of str or str')
+    typing.Union[typing.List[str], str]
+    >>> parse('list of (int, str)')
+    typing.List[typing.Tuple[int, str]]
+
 
 Adding type hints to functions and parameters
 ---------------------------------------------