Moving psutil to third_party. This is first step for Media Performance test project.

third_party/psutil/psutil/compat.py

+#!/usr/bin/env python
+#
+# $Id: compat.py 712 2010-10-20 15:25:57Z g.rodola $
+#
+
+"""Module which provides compatibility with older Python versions."""
+
+from operator import itemgetter as _itemgetter
+from keyword import iskeyword as _iskeyword
+import sys as _sys
+
+
+def namedtuple(typename, field_names, verbose=False, rename=False):
+    """A collections.namedtuple implementation written in Python
+    to support Python versions < 2.6.
+
+    Taken from: http://code.activestate.com/recipes/500261/
+    """
+    # Parse and validate the field names.  Validation serves two
+    # purposes, generating informative error messages and preventing
+    # template injection attacks.
+    if isinstance(field_names, basestring):
+         # names separated by whitespace and/or commas
+        field_names = field_names.replace(',', ' ').split()
+    field_names = tuple(map(str, field_names))
+    if rename:
+        names = list(field_names)
+        seen = set()
+        for i, name in enumerate(names):
+            if (not min(c.isalnum() or c=='_' for c in name) or _iskeyword(name)
+                or not name or name[0].isdigit() or name.startswith('_')
+                or name in seen):
+                    names[i] = '_%d' % i
+            seen.add(name)
+        field_names = tuple(names)
+    for name in (typename,) + field_names:
+        if not min(c.isalnum() or c=='_' for c in name):
+            raise ValueError('Type names and field names can only contain ' \
+                             'alphanumeric characters and underscores: %r'
+                             % name)
+        if _iskeyword(name):
+            raise ValueError('Type names and field names cannot be a keyword: %r' \
+                             % name)
+        if name[0].isdigit():
+            raise ValueError('Type names and field names cannot start with a ' \
+                             'number: %r' % name)
+    seen_names = set()
+    for name in field_names:
+        if name.startswith('_') and not rename:
+            raise ValueError('Field names cannot start with an underscore: %r'
+                             % name)
+        if name in seen_names:
+            raise ValueError('Encountered duplicate field name: %r' % name)
+        seen_names.add(name)
+
+    # Create and fill-in the class template
+    numfields = len(field_names)
+    # tuple repr without parens or quotes
+    argtxt = repr(field_names).replace("'", "")[1:-1]
+    reprtxt = ', '.join('%s=%%r' % name for name in field_names)
+    template = '''class %(typename)s(tuple):
+        '%(typename)s(%(argtxt)s)' \n
+        __slots__ = () \n
+        _fields = %(field_names)r \n
+        def __new__(_cls, %(argtxt)s):
+            return _tuple.__new__(_cls, (%(argtxt)s)) \n
+        @classmethod
+        def _make(cls, iterable, new=tuple.__new__, len=len):
+            'Make a new %(typename)s object from a sequence or iterable'
+            result = new(cls, iterable)
+            if len(result) != %(numfields)d:
+                raise TypeError('Expected %(numfields)d arguments, got %%d' %% len(result))
+            return result \n
+        def __repr__(self):
+            return '%(typename)s(%(reprtxt)s)' %% self \n
+        def _asdict(self):
+            'Return a new dict which maps field names to their values'
+            return dict(zip(self._fields, self)) \n
+        def _replace(_self, **kwds):
+            'Return a new %(typename)s object replacing specified fields with new values'
+            result = _self._make(map(kwds.pop, %(field_names)r, _self))
+            if kwds:
+                raise ValueError('Got unexpected field names: %%r' %% kwds.keys())
+            return result \n
+        def __getnewargs__(self):
+            return tuple(self) \n\n''' % locals()
+    for i, name in enumerate(field_names):
+        template += '        %s = _property(_itemgetter(%d))\n' % (name, i)
+    if verbose:
+        print template
+
+    # Execute the template string in a temporary namespace
+    namespace = dict(_itemgetter=_itemgetter, __name__='namedtuple_%s' % typename,
+                     _property=property, _tuple=tuple)
+    try:
+        exec template in namespace
+    except SyntaxError, e:
+        raise SyntaxError(e.message + ':\n' + template)
+    result = namespace[typename]
+
+    # For pickling to work, the __module__ variable needs to be set
+    # to the frame where the named tuple is created.  Bypass this
+    # step in enviroments where sys._getframe is not defined (Jython
+    # for example) or sys._getframe is not defined for arguments
+    # greater than 0 (IronPython).
+    try:
+        result.__module__ = _sys._getframe(1).f_globals.get('__name__', '__main__')
+    except (AttributeError, ValueError):
+        pass
+
+    return result