qa : flake8 issues

lib/spack/spack/spec.py

@@ -158,6 +158,7 @@
     'nolink': nolink,
 }
 
+
 def colorize_spec(spec):
     """Returns a spec colorized according to the colors specified in
        color_formats."""
@@ -1020,7 +1021,7 @@ def from_yaml(stream):
         """
         try:
             yfile = yaml.load(stream)
-        except MarkedYAMLError, e:
+        except MarkedYAMLError as e:
             raise SpackYAMLError("error parsing YAML spec:", str(e))
 
         nodes = yfile['spec']
@@ -1334,7 +1335,7 @@ def flat_dependencies_with_deptype(self, **kwargs):
 
             return flat_deps
 
-        except UnsatisfiableSpecError, e:
+        except UnsatisfiableSpecError as e:
             # Here, the DAG contains two instances of the same package
             # with inconsistent constraints.  Users cannot produce
             # inconsistent specs like this on the command line: the
@@ -1369,7 +1370,7 @@ def _evaluate_dependency_conditions(self, name):
                     dep = Spec(name)
                 try:
                     dep.constrain(dep_spec)
-                except UnsatisfiableSpecError, e:
+                except UnsatisfiableSpecError as e:
                     e.message = ("Conflicting conditional dependencies on"
                                  "package %s for spec %s" % (self.name, self))
                     raise e
@@ -1455,7 +1456,7 @@ def _merge_dependency(self, dep, deptypes, visited, spec_deps,
         try:
             changed |= spec_deps[dep.name].spec.constrain(dep)
 
-        except UnsatisfiableSpecError, e:
+        except UnsatisfiableSpecError as e:
             e.message = "Invalid spec: '%s'. "
             e.message += "Package %s requires %s %s, but spec asked for %s"
             e.message %= (spec_deps[dep.name].spec, dep.name,
@@ -2389,7 +2390,7 @@ def do_parse(self):
                     # errors now?
                     specs.append(self.spec(None, True))
 
-        except spack.parse.ParseError, e:
+        except spack.parse.ParseError as e:
             raise SpecParseError(e)
 
         # If the spec has an os or a target and no platform, give it
@@ -2834,4 +2835,4 @@ class AmbiguousHashError(SpecError):
     def __init__(self, msg, *specs):
         super(AmbiguousHashError, self).__init__(msg)
         for spec in specs:
-            print '    ', spec.format('$.$@$%@+$+$=$#')
+            print('    ', spec.format('$.$@$%@+$+$=$#'))

lib/spack/spack/test/cmd/test_install.py

@@ -24,15 +24,22 @@
 ##############################################################################
 import StringIO
 import collections
-from contextlib import contextmanager
+import os
+import unittest
+import contextlib
+
+import spack
+import spack.cmd
 
 FILE_REGISTRY = collections.defaultdict(StringIO.StringIO)
 
+
 # Monkey-patch open to write module files to a StringIO instance
-@contextmanager
+@contextlib.contextmanager
 def mock_open(filename, mode):
     if not mode == 'wb':
-        raise RuntimeError('test.test_install : unexpected opening mode for monkey-patched open')
+        message = 'test.test_install : unexpected opening mode for mock_open'
+        raise RuntimeError(message)
 
     FILE_REGISTRY[filename] = StringIO.StringIO()
 
@@ -43,18 +50,14 @@ def mock_open(filename, mode):
         FILE_REGISTRY[filename] = handle.getvalue()
         handle.close()
 
-import os
-import unittest
 
-import spack
+# The use of __import__ is necessary to maintain a name with hyphen (which
-import spack.cmd
+# cannot be an identifier in python)
-
-
-# The use of __import__ is necessary to maintain a name with hyphen (which cannot be an identifier in python)
 test_install = __import__("spack.cmd.test-install", fromlist=['test_install'])
 
 
 class MockSpec(object):
+
     def __init__(self, name, version, hashStr=None):
         self._dependencies = {}
         self.name = name
@@ -96,6 +99,7 @@ def short_spec(self):
 
 
 class MockPackage(object):
+
     def __init__(self, spec, buildLogPath):
         self.name = spec.name
         self.spec = spec
@@ -107,6 +111,7 @@ def do_install(self, *args, **kwargs):
 
 
 class MockPackageDb(object):
+
     def __init__(self, init=None):
         self.specToPkg = {}
         if init:
@@ -127,6 +132,7 @@ def mock_fetch_log(path):
 
 
 class MockArgs(object):
+
     def __init__(self, package):
         self.package = package
         self.jobs = None
@@ -162,7 +168,7 @@ def monkey_parse_specs(x, concretize):
         test_install.open = mock_open
 
         # Clean FILE_REGISTRY
-        FILE_REGISTRY = collections.defaultdict(StringIO.StringIO)
+        FILE_REGISTRY.clear()
 
         pkgX.installed = False
         pkgY.installed = False
@@ -204,4 +210,5 @@ def test_dependency_already_installed(self):
             self.assertTrue('tests="2"' in content)
             self.assertTrue('failures="0"' in content)
             self.assertTrue('errors="0"' in content)
-            self.assertEqual(sum('skipped' in line for line in content.split('\n')), 2)
+            self.assertEqual(
+                sum('skipped' in line for line in content.split('\n')), 2)