Configure anaconda-mode and company-anaconda

* Add functions to disable or enable anaconda-mode with support
* Open Python org-mode source edit-buffers in anaconda-mode.

README.org

@@ -975,19 +975,75 @@ option to run different commands on those selections.
 
 ** Python coding
 
-Here, the focus is on three ways to extend Emacs's built-in ~python-mode~ out of
+The [[https://www.emacswiki.org/emacs/PythonProgrammingInEmacs][Python Programming in Emacs]] wiki page lists options to enhance Emacs's
-the options listed on the [[https://www.emacswiki.org/emacs/PythonProgrammingInEmacs][Python Programming in Emacs]] wiki page:
+built-in ~python-mode~. Here, the focus is on two packages:
+1. [[https://github.com/pythonic-emacs/anaconda-mode][Anaconda - code navigation, documentation lookup, and completion for Python]].
 2. [[https://github.com/joaotavora/eglot][Eglot - Emacs polyGLOT: an Emacs LSP client that stays out of your way]].  The
    maintainer also contributes to Emacs itself and has a deep understanding of
    [[https://sheer.tj/the_way_of_emacs.html][the Way of Emacs]].  He refuses to add new features without seeing how they fit
-   into [[https://sheer.tj/the_way_of_emacs.html][the Way of Emacs]] as this discussion at [[https://github.com/joaotavora/eglot/issues/523][Eglot github issue: org-mode
+   into [[https://sheer.tj/the_way_of_emacs.html][the Way of Emacs]] as this discussion on [[https://github.com/joaotavora/eglot/issues/523][org-mode source code blocks]]
-   source code blocks]] shows.
+   shows.
+
+The snippet below initializes [[https://github.com/pythonic-emacs/anaconda-mode][anaconda]]. See [[https://github.com/jorgenschaefer/elpy/blob/8d0de310d41ebf06b22321a8534546447456870c/elpy.el#L2775][elpy-module-company]] for how to
+handle ~company-backends~ as a local variable and the call to ~advice~ opens
+Python org-mode edit-buffers in ~anaconda-mode~.
+#+begin_src emacs-lisp
+  (with-eval-after-load 'python
+
+    (with-eval-after-load 'company
+      (when (and (fboundp 'anaconda-mode)
+                 (fboundp 'company-anaconda))
+        (defun my-disable-anaconda-mode ()
+          (when (derived-mode-p 'python-mode)
+            (anaconda-mode -1)
+            (set (make-local-variable 'company-backends)
+                 (delq 'company-anaconda
+                       (mapcar #'identity company-backends)))
+            (anaconda-eldoc-mode -1)))
+
+        (defun my-enable-anaconda-mode ()
+          (when (derived-mode-p 'python-mode)
+            (anaconda-mode +1)
+            (set (make-local-variable 'company-backends)
+                 (cons 'company-anaconda
+                       (delq 'company-semantic
+                             (delq 'company-capf
+                                   (mapcar #'identity company-backends)))))
+            (anaconda-eldoc-mode
+             (if (file-remote-p default-directory) -1 1))))))
+
+    (unless (and (fboundp 'my-disable-anaconda-mode)
+                 (fboundp 'my-enable-anaconda-mode))
+      (when (fboundp 'anaconda-mode)
+        (defun my-disable-anaconda-mode ()
+          (when (derived-mode-p 'python-mode)
+            (anaconda-mode -1)
+            (anaconda-eldoc-mode -1)))
+
+        (defun my-enable-anaconda-mode ()
+          (when (derived-mode-p 'python-mode)
+            (anaconda-mode +1)
+            (anaconda-eldoc-mode
+             (if (file-remote-p default-directory) -1 1))))))
+
+    (when (fboundp 'my-enable-anaconda-mode)
+      (advice-add 'org-edit-src-code :after #'my-enable-anaconda-mode))
+
+    (when (and (fboundp 'my-disable-anaconda-mode)
+               (fboundp 'my-enable-anaconda-mode))
+      (defun my-toggle-anaconda-mode ()
+        (interactive)
+        (if (bound-and-true-p anaconda-mode)
+            (my-disable-anaconda-mode)
+          (my-enable-anaconda-mode)))))
+#+end_src
 
 #+attr_latex: :options bgcolor=LightGoldenrodYellow
 #+begin_src python :tangle example.py :comments link
   import numpy
   import astropy.units as apu
 
+  a = numpy.arange(0, 11)
   a = numpy.linspace(0, 10, num=11)
   q = apu.Quantity(a, apu.meter)
   print(q)