pretty printing call args, fix #7

Author: samuelcolvin

devtools/prettier.py

@@ -103,8 +103,9 @@ def _format_tuples(self, value: tuple, value_repr: str, indent_current: int, ind
             self._stream.write(value.__class__.__name__ + '(\n')
             for field, v in zip(fields, value):
                 self._stream.write(indent_new * self._c)
-                self._stream.write(field)
-                self._stream.write('=')
+                if field:  # field is falsy for odd things like call_args
+                    self._stream.write(str(field))
+                    self._stream.write('=')
                 self._format(v, indent_new, False)
                 self._stream.write(',\n')
             self._stream.write(indent_current * self._c + ')')

tests/test_prettier.py

@@ -1,5 +1,6 @@
 import string
 from collections import OrderedDict, namedtuple
+from unittest.mock import MagicMock
 
 import numpy
 
@@ -206,3 +207,15 @@ def test_deep_objects():
     ),
     {1, 2, 3},
 )"""
+
+
+def test_call_args():
+    m = MagicMock()
+    m(1, 2, 3, a=4)
+    v = pformat(m.call_args)
+
+    assert v == """\
+_Call(
+    (1, 2, 3),
+    {'a': 4},
+)"""