Issue #4113: Added custom __repr__ method to functools.partial.

Lib/test/test_functools.py

@@ -146,6 +146,32 @@ class TestPartial(unittest.TestCase):
         join = self.thetype(''.join)
         self.assertEqual(join(data), '0123456789')
 
+    def test_repr(self):
+        args = (object(), object())
+        args_repr = ', '.join(repr(a) for a in args)
+        kwargs = {'a': object(), 'b': object()}
+        kwargs_repr = ', '.join("%s=%r" % (k, v) for k, v in kwargs.items())
+        if self.thetype is functools.partial:
+            name = 'functools.partial'
+        else:
+            name = self.thetype.__name__
+
+        f = self.thetype(capture)
+        self.assertEqual('{}({!r})'.format(name, capture),
+                         repr(f))
+
+        f = self.thetype(capture, *args)
+        self.assertEqual('{}({!r}, {})'.format(name, capture, args_repr),
+                         repr(f))
+
+        f = self.thetype(capture, **kwargs)
+        self.assertEqual('{}({!r}, {})'.format(name, capture, kwargs_repr),
+                         repr(f))
+
+        f = self.thetype(capture, *args, **kwargs)
+        self.assertEqual('{}({!r}, {}, {})'.format(name, capture, args_repr, kwargs_repr),
+                         repr(f))
+
     def test_pickle(self):
         f = self.thetype(signature, 'asdf', bar=True)
         f.add_something_to__dict__ = True
@@ -163,6 +189,9 @@ class TestPythonPartial(TestPartial):
 
     thetype = PythonPartial
 
+    # the python version hasn't a nice repr
+    def test_repr(self): pass
+
     # the python version isn't picklable
     def test_pickle(self): pass
 

Lib/test/test_inspect.py

@@ -12,6 +12,7 @@ from test.support import run_unittest
 
 from test import inspect_fodder as mod
 from test import inspect_fodder2 as mod2
+from test import inspect_fodder3 as mod3
 
 # C module for test_findsource_binary
 import unicodedata
@@ -388,6 +389,12 @@ class TestBuggyCases(GetSourceBase):
         self.assertEqual(inspect.findsource(co), (lines,0))
         self.assertEqual(inspect.getsource(co), lines[0])
 
+class TestNoEOF(GetSourceBase):
+    fodderFile = mod3
+
+    def test_class(self):
+        self.assertSourceEqual(mod3.X, 1, 2)
+
 # Helper for testing classify_class_attrs.
 def attrs_wo_objs(cls):
     return [t[:3] for t in inspect.classify_class_attrs(cls)]

Misc/NEWS

@@ -46,6 +46,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #4113: Added custom ``__repr__`` method to ``functools.partial``.
+  Original patch by Daniel Urban.
+
 - Issue #10273: Rename `assertRegexpMatches` and `assertRaisesRegexp` to
   `assertRegex` and `assertRaisesRegex`.
 

Modules/_functoolsmodule.c

@@ -196,6 +196,48 @@ static PyGetSetDef partial_getsetlist[] = {
     {NULL} /* Sentinel */
 };
 
+static PyObject *
+partial_repr(partialobject *pto)
+{
+    PyObject *result;
+    PyObject *arglist;
+    PyObject *tmp;
+    Py_ssize_t i, n;
+
+    arglist = PyUnicode_FromString("");
+    if (arglist == NULL) {
+        return NULL;
+    }
+    /* Pack positional arguments */
+    assert (PyTuple_Check(pto->args));
+    n = PyTuple_GET_SIZE(pto->args);
+    for (i = 0; i < n; i++) {
+        tmp = PyUnicode_FromFormat("%U, %R", arglist,
+                                   PyTuple_GET_ITEM(pto->args, i));
+        Py_DECREF(arglist);
+        if (tmp == NULL)
+            return NULL;
+        arglist = tmp;
+    }
+    /* Pack keyword arguments */
+    assert (pto->kw == Py_None  ||  PyDict_Check(pto->kw));
+    if (pto->kw != Py_None) {
+        PyObject *key, *value;
+        for (i = 0; PyDict_Next(pto->kw, &i, &key, &value);) {
+            tmp = PyUnicode_FromFormat("%U, %U=%R", arglist,
+                                       key, value);
+            Py_DECREF(arglist);
+            if (tmp == NULL)
+                return NULL;
+            arglist = tmp;
+        }
+    }
+    result = PyUnicode_FromFormat("%s(%R%U)", Py_TYPE(pto)->tp_name,
+                                  pto->fn, arglist);
+    Py_DECREF(arglist);
+    return result;
+}
+
 /* Pickle strategy:
    __reduce__ by itself doesn't support getting kwargs in the unpickle
    operation so we define a __setstate__ that replaces all the information
@@ -254,7 +296,7 @@ static PyTypeObject partial_type = {
     0,                                  /* tp_getattr */
     0,                                  /* tp_setattr */
     0,                                  /* tp_reserved */
-    0,                                  /* tp_repr */
+    (reprfunc)partial_repr,             /* tp_repr */
     0,                                  /* tp_as_number */
     0,                                  /* tp_as_sequence */
     0,                                  /* tp_as_mapping */