Use absolute path to python executable

install

@@ -1,6 +1,8 @@
 #! /usr/bin/env python3
 
 import os
+import sys
+
 from string import Template
 from subprocess import check_call
 
@@ -12,7 +14,8 @@ CURRENT_DIR      = os.path.dirname(os.path.realpath(__file__))
 EXEC_PATH        = os.path.join(CURRENT_DIR, EXEC)
 SERVICE_TEMPLATE = os.path.join(CURRENT_DIR, SERVICE)
 SERVICE_FILE     = os.path.join(SYSTEM_DIR, SERVICE)
-EXEC_START       = f'python3 {EXEC}'
+PYTHON           = sys.executable
+EXEC_START       = f'{PYTHON} {EXEC}'
 
 with open(SERVICE_TEMPLATE) as f:
     serviceTemplate = Template(f.read())