Use pathlib in `sys.path` manipulation examples

doc/development/tutorials/extending_build.rst

@@ -313,10 +313,10 @@ For example:
 
 .. code-block:: python
 
-   import os
    import sys
+   from pathlib import Path
 
-   sys.path.append(os.path.abspath("./_ext"))
+   sys.path.append(str(Path('_ext').resolve()))
 
    extensions = ['todo']
 

doc/development/tutorials/extending_syntax.rst

@@ -169,10 +169,10 @@ For example:
 
 .. code-block:: python
 
-   import os
    import sys
+   from pathlib import Path
 
-   sys.path.append(os.path.abspath("./_ext"))
+   sys.path.append(str(Path('_ext').resolve()))
 
    extensions = ['helloworld']
 

doc/usage/configuration.rst

@@ -223,11 +223,14 @@ General configuration
 
    Ensure that absolute paths are used when modifying :data:`sys.path`.
    If your custom extensions live in a directory that is relative to the
-   :term:`configuration directory`, use :func:`os.path.abspath` like so:
+   :term:`configuration directory`, use :meth:`pathlib.Path.resolve` like so:
 
    .. code-block:: python
 
-      import os, sys; sys.path.append(os.path.abspath('sphinxext'))
+      import sys
+      from pathlib import Path
+
+      sys.path.append(str(Path('sphinxext').resolve()))
 
       extensions = [
          ...

doc/usage/extensions/index.rst

@@ -69,11 +69,14 @@ Where to put your own extensions?
 Extensions local to a project should be put within the project's directory
 structure.  Set Python's module search path, ``sys.path``, accordingly so that
 Sphinx can find them.  For example, if your extension ``foo.py`` lies in the
-``exts`` subdirectory of the project root, put into :file:`conf.py`::
+``exts`` subdirectory of the project root, put into :file:`conf.py`:
 
-   import sys, os
+.. code-block:: python
 
-   sys.path.append(os.path.abspath('exts'))
+   import sys
+   from pathlib import Path
+
+   sys.path.append(str(Path('exts').resolve()))
 
    extensions = ['foo']