setup.py: Require at least python 3.5

We require ostree from July 2016 and we also require bubblewrap,
both of which are more recent than python 3.5 which was released
in September 2015. There is no point to have version conditional
code here or support earlier versions of python.

1 files changed, 4 insertions, 0 deletions

diff --git a/setup.py b/setup.py
index c776a217a..7e8716378 100755
--- a/setup.py
+++ b/setup.py
@@ -20,6 +20,10 @@
 
 import sys
 
+if sys.version_info[0] != 3 or sys.version_info[1] < 5:
+    print("BuildStream requires Python >= 3.5")
+    sys.exit(1)
+
 try:
     from setuptools import setup, find_packages
 except ImportError: