This plugin is written for Python 2, but since gedit 3.8, only Python 3 plugins are supported. So some small changes are required.


Modify the installer (gedit-markdown.sh) to install the python3 markdown module:

This is a patch that you can apply on the existing file (or you can just copy the full modified version available here):

--- gedit-markdown_ori.sh   2014-05-14 16:14:58.386700310 +0200
+++ gedit-markdown.sh   2014-05-14 15:42:21.038783248 +0200
@@ -263,7 +263,9 @@

 # Note: sous Archlinux, «/usr/bin/python» correspond à Python 3. On teste donc les
 # chemins pour Python 2 en premier.
-if type -p python2.7 &gt; /dev/null; then
+if type -p python3 &gt; /dev/null; then
+   binPython=$(type -p python3)
+elif type -p python2.7 &gt; /dev/null; then
    binPython=$(type -p python2.7)
 elif type -p python2.6 &gt; /dev/null; then
    binPython=$(type -p python2.6)
@@ -287,15 +289,15 @@
            cheminPythonMarkdown=python-markdown/python2
            cheminPythonSitePackages=$("$binPython" -m site --user-site)
        fi
-#  elif [[ ${versionPython:0:1} == 3 ]]; then
-#      compareVersions "$versionPython" "3.1"
-#      
-#      if [[ $? == 2 ]]; then
-#          bonneVersionPython=false
-#      else
-#          cheminPythonMarkdown=python-markdown/python3
-#          cheminPythonSitePackages=$("$binPython" -m site --user-site)
-#      fi
+   elif [[ ${versionPython:0:1} == 3 ]]; then
+       compareVersions "$versionPython" "3.1"
+       
+       if [[ $? == 2 ]]; then
+           bonneVersionPython=false
+       else
+           cheminPythonMarkdown=python-markdown/python3
+           cheminPythonSitePackages=$("$binPython" -m site --user-site)
+       fi
    else
        bonneVersionPython=false
    fi

Run ./gedit-markdown.sh install

You should see python 3.4 instead of 2.7:

############################################################
##
## Installation of gedit-markdown
##
############################################################

## First step: check dependencies

- gedit: 3.10.4
- Python: 3.4

[...]

Change the plugin loader to python3

Replace /home/aarold/.local/share/gedit/plugins/markdown-preview.plugin with:

[Plugin]
Loader=python3
Module=markdown-preview
IAge=3
Name=Markdown Preview
Name[fr]=Aperçu Markdown
Description=Show the HTML version of the Markdown text you're editing
Description[fr]=Affiche l'aperçu en HTML du document Markdown en cours d'édition
Authors=Michele Campeotto &lt;micampe@micampe.it&gt;\nJean-Philippe Fleury &lt;contact@jpfleury.net&gt;
Copyright=Copyright © 2005, 2006 Michele Campeotto\nCopyright © 2009, 2011-2012 Jean-Philippe Fleury
Website=http://www.jpfleury.net/logiciels/gedit-markdown.php

Convert /home/aarold/.local/share/gedit/plugins/markdown-preview/__init__.py to python3:

Run:

2to3 -w /home/aarold/.local/share/gedit/plugins/markdown-preview/__init__.py


Finally open this file and edit line 86 (remove the binary mode, "wb" -> "w"):

with open(confFile, "w") as confFile:

Activate the plugin in Gedit as you did.


How to install the gedit markdown-preview plugin on 14.04?
ParametricPlot[{ Cos[u]^v , u}, {v, 0, 1}, {u, 0, Pi/2 }, Mesh -&gt; {5, 5}]

ParametricPlot[Tootip[{ Cos[u]^v , u}, {v, 0, 1}], {u, 0, Pi/2 }]


How to introduce Tooltip pointers?

( ParametricPlot3D Tooltip may not be available yet? ).

EDIT1:

Updating my question. Please ignore everything above the EDIT1: 

ParametricPlot[ { u Cos[v], u Sin[v]}, {u, 1, 2}, {v, 0, Pi/2}, 
 Mesh -&gt; {3, 5}]


It is a two parameter plot. So I like to see either of $ u,v $ parameter lines being pointed at with the value of the set constant only.

To make clear with an example, when I mouse over circles, like to see Tooltips in the above ParametricPlot pointing with SINGLE values {$ 1,1.25,1.5,1.75,2 $} and also when mousing over radial lines  SINGLE {$ 0, \pi/12, 2 \pi/12,...5 \pi/12, \pi/2 $ }  for the radial lines.

It is a very simple requirement that I believe could cater to a common requirement of a majority of users. I am not looking at high frequency sophisticated dynamic motion picture display. Not even looking at double parameter display at intersection/junction  of parameter lines. Just like the way height is displayed for ContourPlots. Here it is required for both parameters, with or without Shading. 

Asked this because it is not (yet) a standard feature.

EDIT2:

Based on Michael E2's lines, tried to depict eccentric circles.In the space  between parameter lines it may need to be somewhat changed.

{umin, umax, ustep, vmin, vmax, vstep} = {0, 2 Pi, Pi/8, 0.25, 1.25, .25};
ParametricPlot[{Sqrt[2 + v^2] + v Cos[u], v Sin[u]}, {u, umin,  umax}, {v, vmin, vmax}, Mesh -&gt; {Table[{u, Tooltip[Null, u]}, {u, umin, umax, ustep}], 
    Table[{v, Tooltip[Null, v]}, {v, vmin, vmax, vstep}]}] /. {g___, 
   Tooltip[_, label_], l_Line} :&gt; {g, Tooltip[l, label]}

