Style fixes

3 files changed, 11 insertions, 10 deletions

diff --git a/lib/spack/llnl/util/lang.py b/lib/spack/llnl/util/lang.py
index 8ec7113782..5b56990a6f 100644
--- a/lib/spack/llnl/util/lang.py
+++ b/lib/spack/llnl/util/lang.py
@@ -486,7 +486,7 @@ class HashableMap(MutableMapping):
     """This is a hashable, comparable dictionary.  Hash is performed on
     a tuple of the values in the dictionary."""
 
-    __slots__ = 'dict',
+    __slots__ = ("dict",)
 
     def __init__(self):
         self.dict = {}
diff --git a/lib/spack/spack/parse.py b/lib/spack/spack/parse.py
index 91cebe9063..10f460e776 100644
--- a/lib/spack/spack/parse.py
+++ b/lib/spack/spack/parse.py
@@ -17,7 +17,7 @@ import spack.util.path as sp
 class Token(object):
     """Represents tokens; generated from input by lexer and fed to parse()."""
 
-    __slots__ = 'type', 'value', 'start', 'end'
+    __slots__ = "type", "value", "start", "end"
 
     def __init__(self, type, value="", start=0, end=0):
         self.type = type
@@ -41,7 +41,7 @@ class Token(object):
 class Lexer(object):
     """Base class for Lexers that keep track of line numbers."""
 
-    __slots__ = 'scanner0', 'scanner1', 'mode', 'mode_switches_01', 'mode_switches_10'
+    __slots__ = "scanner0", "scanner1", "mode", "mode_switches_01", "mode_switches_10"
 
     def __init__(self, lexicon0, mode_switches_01=[], lexicon1=[], mode_switches_10=[]):
         self.scanner0 = re.Scanner(lexicon0)
@@ -93,7 +93,7 @@ class Lexer(object):
 class Parser(object):
     """Base class for simple recursive descent parsers."""
 
-    __slots__ = 'tokens', 'token', 'next', 'lexer', 'text'
+    __slots__ = "tokens", "token", "next", "lexer", "text"
 
     def __init__(self, lexer):
         self.tokens = iter([])  # iterators over tokens, handled in order.
diff --git a/lib/spack/spack/spec.py b/lib/spack/spack/spec.py
index 4f15b5b839..8263c25876 100644
--- a/lib/spack/spack/spec.py
+++ b/lib/spack/spack/spec.py
@@ -243,7 +243,7 @@ class ArchSpec(object):
         """Return the frontend architecture"""
         return ArchSpec._return_arch("frontend", "frontend")
 
-    __slots__ = '_platform', '_os', '_target'
+    __slots__ = "_platform", "_os", "_target"
 
     def __init__(self, spec_or_platform_tuple=(None, None, None)):
         """Architecture specification a package should be built with.
@@ -555,7 +555,7 @@ class CompilerSpec(object):
     versions that a package should be built with.  CompilerSpecs have a
     name and a version list."""
 
-    __slots__ = 'name', 'versions'
+    __slots__ = "name", "versions"
 
     def __init__(self, *args):
         nargs = len(args)
@@ -681,7 +681,7 @@ class DependencySpec(object):
     - deptypes: list of strings, representing dependency relationships.
     """
 
-    __slots__ = 'parent', 'spec', 'deptypes'
+    __slots__ = "parent", "spec", "deptypes"
 
     def __init__(self, parent, spec, deptypes):
         self.parent = parent
@@ -724,7 +724,7 @@ _valid_compiler_flags = ["cflags", "cxxflags", "fflags", "ldflags", "ldlibs", "c
 
 class FlagMap(lang.HashableMap):
 
-    __slots__ = 'spec',
+    __slots__ = ("spec",)
 
     def __init__(self, spec):
         super(FlagMap, self).__init__()
@@ -810,7 +810,8 @@ class _EdgeMap(Mapping):
 
     Edges are stored in a dictionary and keyed by package name.
     """
-    __slots__ = 'edges', 'store_by_child'
+
+    __slots__ = "edges", "store_by_child"
 
     def __init__(self, store_by=EdgeDirection.child):
         # Sanitize input arguments
@@ -4992,7 +4993,7 @@ _lexer = SpecLexer()
 class SpecParser(spack.parse.Parser):
     """Parses specs."""
 
-    __slots__ = 'previous', '_initial'
+    __slots__ = "previous", "_initial"
 
     def __init__(self, initial_spec=None):
         """Construct a new SpecParser.