Edit module loading config in node_search.sh

Instead of always loading a python3 module which may spit
annoying messages to the screen, a check is performed if python3
is already in the path. If so, a module is not loaded.

README

@@ -32,8 +32,9 @@
   pain to have to load the python 3 module everytime you wanted check the 
   status of a job, so this bash script sets up the environment temporarily
   to run Python 3 scripts. The only configuration needed with this is to
-  properly specifiy the full path for the actual python 3 script and to edit the
-  paths for the useful module information to properly grab a version of Python 3.
+  properly specifiy the full path for the actual python 3 script. Occasionally,
+  the python3 module which is loaded will also have to be updated depending on
+  when a module is deprecated. 
 
 * node_search was developed for a specific environment. If you are attempting to 
   use it for your own organization, there may be a few hiccups. In theory, as long

node_search.sh

@@ -8,9 +8,12 @@
 # line 11 must be changed to load a correct version of python. As of July 5, 2018 python/3.6.4
 # is the latest version of python.
 
-source /opt/crc/Modules/current/init/bash
 
-module load python/3.6.4
+path_to_python3=$(which python3 2>/dev/null)
+if [ ! -x "$path_to_python3" ] ; then
+    source /opt/crc/Modules/current/init/bash
+    module load python/3.6.4
+fi
 
 
 # Calling the node_search.py script. All arugments will be passed into node_search