Update signature presentation in pinfo classes

classes:

- init definition comes before class docstring
- remove Constructor info block, because it no longer has multiple entries
- don't include instance call definition as definition

objects:

- don't duplicate call def and definition in callables

IPython/core/oinspect.py

@@ -447,12 +447,12 b' class Inspector:'
         if inspect.isclass(obj) and hasattr(obj, '__init__'):
             init_ds = getdoc(obj.__init__)
             if init_ds is not None:
-                lines.append(head("Constructor Docstring:"))
+                lines.append(head("Init Docstring:"))
                 lines.append(indent(init_ds))
         elif hasattr(obj,'__call__'):
             call_ds = getdoc(obj.__call__)
             if call_ds:
-                lines.append(head("Calling Docstring:"))
+                lines.append(head("Call Docstring:"))
                 lines.append(indent(call_ds))
 
         if not lines:
@@ -494,7 +494,7 b' class Inspector:'
             # 0-offset, so we must adjust.
             page.page(self.format(openpy.read_py_file(ofile, skip_encoding_cookie=False)), lineno - 1)
 
-    def _format_fields(self, fields, title_width=12):
+    def _format_fields(self, fields, title_width=0):
         """Formats a list of fields for display.
 
         Parameters
@@ -502,10 +502,13 b' class Inspector:'
         fields : list
           A list of 2-tuples: (field_title, field_content)
         title_width : int
-          How many characters to pad titles to. Default 12.
+          How many characters to pad titles to. Default to longest title.
         """
         out = []
         header = self.__head
+        if title_width == 0:
+            for title, _ in fields:
+                title_width = max(len(title) + 2, title_width)
         for title, content in fields:
             if len(content.splitlines()) > 1:
                 title = header(title + ":") + "\n"
@@ -527,7 +530,7 b' class Inspector:'
                     ]
 
     pinfo_fields_obj = [("Class Docstring", "class_docstring"),
-                        ("Constructor Docstring","init_docstring"),
+                        ("Init Docstring", "init_docstring"),
                         ("Call def", "call_def"),
                         ("Call docstring", "call_docstring")]
 
@@ -567,6 +570,9 b' class Inspector:'
             displayfields.append(("Namespace", info['namespace'].rstrip()))
 
         add_fields(self.pinfo_fields3)
+        if info['isclass'] and info['init_definition']:
+            displayfields.append(("Init Definition",
+                            info['init_definition'].rstrip()))
         
         # Source or docstring, depending on detail level and whether
         # source found.
@@ -578,14 +584,9 b' class Inspector:'
 
         # Constructor info for classes
         if info['isclass']:
-            if info['init_definition'] or info['init_docstring']:
-                displayfields.append(("Constructor information", ""))
-                if info['init_definition'] is not None:
-                    displayfields.append((" Definition",
-                                    info['init_definition'].rstrip()))
-                if info['init_docstring'] is not None:
-                    displayfields.append((" Docstring",
-                                        indent(info['init_docstring'])))
+            if info['init_docstring'] is not None:
+                displayfields.append(("Init Docstring",
+                                    info['init_docstring']))
 
         # Info for objects:
         else:
@@ -693,11 +694,6 b' class Inspector:'
                 fname = 'Dynamically generated function. No source code available.'
             out['file'] = fname
         
-        # reconstruct the function definition and print it:
-        defln = self._getdef(obj, oname)
-        if defln:
-            out['definition'] = self.format(defln)
-
         # Docstrings only in detail 0 mode, since source contains them (we
         # avoid repetitions).  If source fails, we add them back, see below.
         if ds and detail_level == 0:
@@ -747,6 +743,11 b' class Inspector:'
 
         # and class docstring for instances:
         else:
+            # reconstruct the function definition and print it:
+            defln = self._getdef(obj, oname)
+            if defln:
+                out['definition'] = self.format(defln)
+
             # First, check whether the instance docstring is identical to the
             # class one, and print it separately if they don't coincide.  In
             # most cases they will, but it's nice to print all the info for
@@ -778,8 +779,12 b' class Inspector:'
             # Call form docstring for callable instances
             if safe_hasattr(obj, '__call__') and not is_simple_callable(obj):
                 call_def = self._getdef(obj.__call__, oname)
-                if call_def is not None:
-                    out['call_def'] = self.format(call_def)
+                if call_def:
+                    call_def = self.format(call_def)
+                    # it may never be the case that call def and definition differ,
+                    # but don't include the same signature twice
+                    if call_def != out.get('definition'):
+                        out['call_def'] = call_def
                 call_ds = getdoc(obj.__call__)
                 # Skip Python's auto-generated docstrings
                 if call_ds == _func_call_docstring:

IPython/core/tests/test_debugger.py

@@ -116,14 +116,14 b' def test_ipdb_magics():'
      ipdb> pdoc ExampleClass
     Class Docstring:
         Docstring for ExampleClass.
-    Constructor Docstring:
+    Init Docstring:
         Docstring for ExampleClass.__init__
     ipdb> pinfo a
-    Type:       ExampleClass
-    String Form:ExampleClass()
-    Namespace:  Local...
-    Docstring:  Docstring for ExampleClass.
-    Constructor Docstring:Docstring for ExampleClass.__init__
+    Type:           ExampleClass
+    String Form:    ExampleClass()
+    Namespace:      Local...
+    Docstring:      Docstring for ExampleClass.
+    Init Docstring: Docstring for ExampleClass.__init__
     ipdb> continue
     
     Restore previous trace function, e.g. for coverage.py    

IPython/core/tests/test_oinspect.py

@@ -242,7 +242,7 b' def test_info():'
     # case-insensitive comparison needed on some filesystems
     # e.g. Windows:
     nt.assert_equal(i['file'].lower(), fname.lower())
-    nt.assert_equal(i['definition'], 'Call(self, *a, **kw)\n')
+    nt.assert_equal(i['definition'], None)
     nt.assert_equal(i['docstring'], Call.__doc__)
     nt.assert_equal(i['source'], None)
     nt.assert_true(i['isclass'])
@@ -260,7 +260,7 b' def test_info():'
     nt.assert_equal(i['docstring'], "Modified instance docstring")
     nt.assert_equal(i['class_docstring'], Call.__doc__)
     nt.assert_equal(i['init_docstring'], Call.__init__.__doc__)
-    nt.assert_equal(i['call_docstring'], c.__call__.__doc__)
+    nt.assert_equal(i['call_docstring'], Call.__call__.__doc__)
 
     # Test old-style classes, which for example may not have an __init__ method.
     if not py3compat.PY3: