python 2.7 compatibility

Author: JohannesBuchner

pymultinest_demo.py

@@ -5,7 +5,7 @@
 from pymultinest.solve import solve
 import os
 try: os.mkdir('chains')
-except FileExistsError: pass
+except OSError: pass
 
 # probability function, taken from the eggbox problem.
 

pymultinest_demo_minimal.py

@@ -2,7 +2,7 @@
 import pymultinest
 import math, os
 try: os.mkdir('chains')
-except FileExistsError: pass
+except OSError: pass
 
 # This "old" api may be a little bit faster and suitable for likelihoods
 # written in C (via ctypes).

pymultinest_demo_old.py

@@ -5,7 +5,7 @@
 import threading, subprocess
 from sys import platform
 try: os.mkdir('chains')
-except FileExistsError: pass
+except OSError: pass
 
 def show(filepath): 
 	""" open the output (pdf) file for the user """