Update docs and tests for attr_pattern (#66)

README.md

@@ -239,10 +239,22 @@ Or you can use it for ``op()`` functions individually with some conditions
 op(obj, enable=check_do_print())
 ```
 
-### include/exclude attributes
+### attribute selection
 
-You can include/exclude attributes using regular expression so ```objprint``` will only print
-out the attributes you are interested in.
+You can customize which attribute to print with name filters.
+
+``objprint`` will try to match the attribute name with ``attr_pattern`` regex. The default
+``attr_pattern`` is ``r"(!_).*"``, which means anything that does NOT start with an `_`.
+
+You can customize ``attr_pattern`` to select the attributes you want to print:
+
+```python
+# This will print all the attributes that do not start with __
+op(Player(), attr_pattern=r"(!__).*")
+```
+
+You can also use ``include`` and ``exclude`` to specify attributes to print with regular expression
+so ```objprint``` will only print out the attributes you are interested in.
 
 ```python
 op(Player(), include=["name"])
@@ -271,7 +283,7 @@ op(Player(), exclude=[".*s"])
 If you specify both ``include`` and ``exclude``, it will do a inclusive check first, then filter out the attributes
 that match exclusive check.
 
-```include``` and ```exclude``` arguments work on ```objprint```, ```objstr``` and ```@add_objprint```.
+```attr_pattern```, ```include``` and ```exclude``` arguments work on ```objprint```, ```objstr``` and ```@add_objprint```.
 
 ### config
 
@@ -288,6 +300,9 @@ that match exclusive check.
 * ``arg_name(False)`` - whether to print the argument expression before the argument value
 * ``skip_recursion(True)`` - whether skip printing recursive data, which would cause infinite recursion without ``depth`` constraint
 * ``honor_existing(True)`` - whether to use the existing user defined ``__repr__`` or ``__str__`` method
+* ``attr_pattern(r"(!_).*")`` - the regex pattern for attribute selection
+* ``include([])`` - the list of attribute regex to do an inclusive filter
+* ``exclude([])`` - the list of attribute regex to do an exclusive filter
 
 You can set the configs globally using ``config`` function
 

tests/test_objprint.py

@@ -189,6 +189,14 @@ def test_arg_name(self):
                 output = buf.getvalue()
             self.assertIn("Unknown", output.split("\n")[0])
 
+    def test_config_attr_pattern(self):
+        with io.StringIO() as buf, redirect_stdout(buf):
+            obj = ObjTest({"elem1": 1, "elem2": 2, "attr3": 3})
+            op(obj, indent=1, attr_pattern=r"elem.")
+            output = buf.getvalue()
+        expected = r"<ObjTest 0x[0-9a-fA-F]*\n .elem1 = 1,\n .elem2 = 2\n>\n"
+        self.assertRegex(output, expected)
+
     def test_config_include(self):
         with io.StringIO() as buf, redirect_stdout(buf):
             obj = ObjTest({"elem1": 1, "elem2": 2, "elem3": 3})

tests/test_objstr.py

@@ -59,6 +59,15 @@ def test_id(self):
         self.assertIn(hex(obj_id), objstr(obj, color=True))
         self.assertIn(hex(obj_id), objstr(obj, color=False))
 
+    def test_attr_pattern(self):
+        t = ObjTest({"pos1": "in", "pos2": "out", "other3": "ex"})
+        output = objstr(t, attr_pattern=r"pos.")
+        self.assertIn("pos1", output)
+        self.assertIn("pos2", output)
+        self.assertNotIn("other3", output)
+        with self.assertRaises(TypeError):
+            output = objstr(t, attr_pattern=[r"pos."])
+
     def test_include(self):
         t = ObjTest({"pos1": "in", "pos2": "out", "pos3": "ex"})
         output = objstr(t, include=['pos1'])