add __bool__ operator

src/rez/package_filter.py

@@ -149,6 +149,8 @@ def __and__(self, other):
     def __nonzero__(self):
         return bool(self._excludes)
 
+    __bool__ = __nonzero__  # py3 compat
+
     @cached_property
     def cost(self):
         """Get the approximate cost of this filter.
@@ -271,6 +273,8 @@ def to_pod(self):
     def __nonzero__(self):
         return any(self.filters)
 
+    __bool__ = __nonzero__  # py3 compat
+
     def __str__(self):
         filters = sorted(self.filters, key=lambda x: (x.cost, str(x)))
         return str(tuple(filters))

src/rez/rex.py

@@ -1050,6 +1050,8 @@ def __repr__(self):
     def __nonzero__(self):
         return bool(self.value())
 
+    __bool__ = __nonzero__  # py3 compat
+
     def __eq__(self, value):
         if isinstance(value, EnvironmentVariable):
             value = value.value()

src/rez/solver.py

@@ -115,7 +115,9 @@ def pr(self, txt='', *args):
         print(txt % args, file=self.buf)
 
     def __nonzero__(self):
-        return self.verbosity
+        return self.verbosity > 0
+
+    __bool__ = __nonzero__  # py3 compat
 
 
 class SolverState(object):

src/rez/utils/_version.py

@@ -1,7 +1,7 @@
 
 
 # Update this value to version up Rez. Do not place anything else in this file.
-_rez_version = "2.47.3"
+_rez_version = "2.47.4"
 
 
 # Copyright 2013-2016 Allan Johns.

src/rez/utils/logging_.py

@@ -59,6 +59,8 @@ def __call__(self, msg, *nargs):
     def __nonzero__(self):
         return bool(self.printer_function)
 
+    __bool__ = __nonzero__  # py3 compat
+
 
 @contextmanager
 def log_duration(printer, msg):

src/rez/utils/memcached.py

@@ -27,7 +27,10 @@ class Client(object):
     - ability to cache None.
     """
     class _Miss(object):
-        def __nonzero__(self): return False
+        def __nonzero__(self):
+            return False
+        __bool__ = __nonzero__  # py3 compat
+
     miss = _Miss()
 
     logger = config.debug_printer("memcache")
@@ -50,6 +53,8 @@ def __init__(self, servers, debug=False):
     def __nonzero__(self):
         return bool(self.servers)
 
+    __bool__ = __nonzero__  # py3 compat
+
     @property
     def client(self):
         """Get the native memcache client.

src/rez/vendor/version/version.py

@@ -384,6 +384,8 @@ def __nonzero__(self):
         """The empty version equates to False."""
         return bool(self.tokens)
 
+    __bool__ = __nonzero__  # py3 compat
+
     def __eq__(self, other):
         return isinstance(other, Version) and self.tokens == other.tokens