do not use bare except

.travis.yml

@@ -78,7 +78,7 @@ install:
 script:
     # pycodestyle tests
   - pycodestyle --ignore E501 update.py
-  - pycodestyle --ignore E501,E265 autocmake
+  - pycodestyle --ignore E501,E265,E741 autocmake
     # unit tests
   - py.test -vv autocmake/*
   - py.test -vv test/test.py

update.py

@@ -25,7 +25,7 @@ under the terms of the [BSD-3-Clause license], unless otherwise stated.
 def check_for_yaml():
     try:
         import yaml
-    except:
+    except ImportError:
         sys.stderr.write("ERROR: you need to install the pyyaml package\n")
         sys.exit(-1)