functools: Add functools.total_ordering.

This commit is the result of copying the total_ordering code and tests
over from CPython v3.7.17.
One test is disabled because it expects builtin objects to have
attributes (__lt__, __gt__, etc.).
Another test for compatibility with pickle is also disabled because
pickle compatibility is currently broken.
Bumped package version to 0.0.8.

The functools code in CPython has the following credits:

Written by Nick Coghlan <ncoghlan at gmail.com>,
Raymond Hettinger <python at rcn.com>,
and Łukasz Langa <lukasz at langa.pl>.
  Copyright (C) 2006-2013 Python Software Foundation.
See C source code for _functools credits/copyright

This work was donated by W Winfried Kretzschmar.

Signed-off-by: W Winfried Kretzschmar <winni@warrenwk.com>

python-stdlib/functools/Dockerfile

@@ -0,0 +1,6 @@
+FROM micropython/unix:v1.22
+
+RUN micropython -m mip install unittest
+RUN micropython -m mip install unittest-discover
+
+

python-stdlib/functools/README.md

@@ -0,0 +1,28 @@
+# functools
+
+# Testing
+
+## Install docker
+
+See https://docs.docker.com/engine/install/
+
+## Build test environment
+
+```
+docker build -t micropython-unittest .
+```
+
+## Run tests
+
+All test files are designed to execute their own tests either as 
+assert statements or as a call to unittest.
+
+```
+for i in test_*.py; do docker run -v .:/code -ti --rm micropython-unittest micropython $i; done
+```
+
+# License
+
+Some files are distributed under the Python Software Foundation license.
+These files reference the Python Software Foundation license at the top of the file.
+

python-stdlib/functools/functools/__init__.py

@@ -0,0 +1,3 @@
+from .total_ordering import total_ordering
+
+from .functools import *

python-stdlib/functools/functools.py → python-stdlib/functools/functools/functools.py

@@ -26,3 +26,4 @@ def reduce(function, iterable, initializer=None):
     for element in it:
         value = function(value, element)
     return value
+

python-stdlib/functools/functools/total_ordering.py

@@ -0,0 +1,133 @@
+"""total_ordering
+
+This code was extracted from the CPython v3.7.17 implementation of Lib/functools.py
+
+Written by Nick Coghlan <ncoghlan at gmail.com>,
+Raymond Hettinger <python at rcn.com>,
+and Łukasz Langa <lukasz at langa.pl>.
+  Copyright (C) 2006-2013 Python Software Foundation.
+See C source code for _functools credits/copyright
+
+This code is distributed under the Python Software License.
+"""
+
+
+################################################################################
+### total_ordering class decorator
+################################################################################
+
+# The total ordering functions all invoke the root magic method directly
+# rather than using the corresponding operator.  This avoids possible
+# infinite recursion that could occur when the operator dispatch logic
+# detects a NotImplemented result and then calls a reflected method.
+
+def _gt_from_lt(self, other, NotImplemented=NotImplemented):
+    'Return a > b.  Computed by @total_ordering from (not a < b) and (a != b).'
+    op_result = self.__lt__(other)
+    if op_result is NotImplemented:
+        return op_result
+    return not op_result and self != other
+
+def _le_from_lt(self, other, NotImplemented=NotImplemented):
+    'Return a <= b.  Computed by @total_ordering from (a < b) or (a == b).'
+    op_result = self.__lt__(other)
+    return op_result or self == other
+
+def _ge_from_lt(self, other, NotImplemented=NotImplemented):
+    'Return a >= b.  Computed by @total_ordering from (not a < b).'
+    op_result = self.__lt__(other)
+    if op_result is NotImplemented:
+        return op_result
+    return not op_result
+
+def _ge_from_le(self, other, NotImplemented=NotImplemented):
+    'Return a >= b.  Computed by @total_ordering from (not a <= b) or (a == b).'
+    op_result = self.__le__(other)
+    if op_result is NotImplemented:
+        return op_result
+    return not op_result or self == other
+
+def _lt_from_le(self, other, NotImplemented=NotImplemented):
+    'Return a < b.  Computed by @total_ordering from (a <= b) and (a != b).'
+    op_result = self.__le__(other)
+    if op_result is NotImplemented:
+        return op_result
+    return op_result and self != other
+
+def _gt_from_le(self, other, NotImplemented=NotImplemented):
+    'Return a > b.  Computed by @total_ordering from (not a <= b).'
+    op_result = self.__le__(other)
+    if op_result is NotImplemented:
+        return op_result
+    return not op_result
+
+def _lt_from_gt(self, other, NotImplemented=NotImplemented):
+    'Return a < b.  Computed by @total_ordering from (not a > b) and (a != b).'
+    op_result = self.__gt__(other)
+    if op_result is NotImplemented:
+        return op_result
+    return not op_result and self != other
+
+def _ge_from_gt(self, other, NotImplemented=NotImplemented):
+    'Return a >= b.  Computed by @total_ordering from (a > b) or (a == b).'
+    op_result = self.__gt__(other)
+    return op_result or self == other
+
+def _le_from_gt(self, other, NotImplemented=NotImplemented):
+    'Return a <= b.  Computed by @total_ordering from (not a > b).'
+    op_result = self.__gt__(other)
+    if op_result is NotImplemented:
+        return op_result
+    return not op_result
+
+def _le_from_ge(self, other, NotImplemented=NotImplemented):
+    'Return a <= b.  Computed by @total_ordering from (not a >= b) or (a == b).'
+    op_result = self.__ge__(other)
+    if op_result is NotImplemented:
+        return op_result
+    return not op_result or self == other
+
+def _gt_from_ge(self, other, NotImplemented=NotImplemented):
+    'Return a > b.  Computed by @total_ordering from (a >= b) and (a != b).'
+    op_result = self.__ge__(other)
+    if op_result is NotImplemented:
+        return op_result
+    return op_result and self != other
+
+def _lt_from_ge(self, other, NotImplemented=NotImplemented):
+    'Return a < b.  Computed by @total_ordering from (not a >= b).'
+    op_result = self.__ge__(other)
+    if op_result is NotImplemented:
+        return op_result
+    return not op_result
+
+_convert = {
+    '__lt__': [('__gt__', _gt_from_lt),
+               ('__le__', _le_from_lt),
+               ('__ge__', _ge_from_lt)],
+    '__le__': [('__ge__', _ge_from_le),
+               ('__lt__', _lt_from_le),
+               ('__gt__', _gt_from_le)],
+    '__gt__': [('__lt__', _lt_from_gt),
+               ('__ge__', _ge_from_gt),
+               ('__le__', _le_from_gt)],
+    '__ge__': [('__le__', _le_from_ge),
+               ('__gt__', _gt_from_ge),
+               ('__lt__', _lt_from_ge)]
+}
+
+def total_ordering(cls):
+    """Class decorator that fills in missing ordering methods"""
+    # Find user-defined comparisons (not those inherited from object).
+    roots = {op for op in _convert if getattr(cls, op, None) is not getattr(object, op, None)}
+    if not roots:
+        raise ValueError('must define at least one ordering operation: < > <= >=')
+    root = max(roots)       # prefer __lt__ to __le__ to __gt__ to __ge__
+    for opname, opfunc in _convert[root]:
+        if opname not in roots:
+# function objects have no attributes in micropython
+#            opfunc.__name__ = opname
+            setattr(cls, opname, opfunc)
+    return cls
+
+

python-stdlib/functools/manifest.py

@@ -1,3 +1,3 @@
-metadata(version="0.0.7")
+metadata(version="0.0.8")
 
 module("functools.py")