Fix __repr__, move it to the base component

CHANGELOG.md

@@ -2,6 +2,7 @@
 ## Fixed
 - Fix missing indentation for generated metadata.json [#600](https://github.com/plotly/dash/issues/600)
 - Fix missing component prop docstring error [#598](https://github.com/plotly/dash/issues/598)
+- Moved `__repr__` to base component instead of being generated. [#492](https://github.com/plotly/dash/pull/492)
 
 ## [0.37.0] - 2019-02-11
 ## Fixed

dash/development/_py_components_generation.py

@@ -61,42 +61,16 @@ def __init__(self, {default_argtext}):
         _locals.update(kwargs)  # For wildcard attrs
         args = {{k: _locals[k] for k in _explicit_args if k != 'children'}}
 
-        for k in {required_args}:
+        for k in {required_props}:
             if k not in args:
                 raise TypeError(
                     'Required argument `' + k + '` was not specified.')
         super({typename}, self).__init__({argtext})
-
-    def __repr__(self):
-        if(any(getattr(self, c, None) is not None
-               for c in self._prop_names
-               if c is not self._prop_names[0])
-           or any(getattr(self, c, None) is not None
-                  for c in self.__dict__.keys()
-                  if any(c.startswith(wc_attr)
-                  for wc_attr in self._valid_wildcard_attributes))):
-            props_string = ', '.join([c+'='+repr(getattr(self, c, None))
-                                      for c in self._prop_names
-                                      if getattr(self, c, None) is not None])
-            wilds_string = ', '.join([c+'='+repr(getattr(self, c, None))
-                                      for c in self.__dict__.keys()
-                                      if any([c.startswith(wc_attr)
-                                      for wc_attr in
-                                      self._valid_wildcard_attributes])])
-            return ('{typename}(' + props_string +
-                   (', ' + wilds_string if wilds_string != '' else '') + ')')
-        else:
-            return (
-                '{typename}(' +
-                repr(getattr(self, self._prop_names[0], None)) + ')')
 '''
 
     filtered_props = reorder_props(filter_props(props))
-    # pylint: disable=unused-variable
-    list_of_valid_wildcard_attr_prefixes = repr(parse_wildcards(props))
-    # pylint: disable=unused-variable
+    wildcard_prefixes = repr(parse_wildcards(props))
     list_of_valid_keys = repr(list(map(str, filtered_props.keys())))
-    # pylint: disable=unused-variable
     docstring = create_docstring(
         component_name=typename,
         props=filtered_props,
@@ -109,7 +83,6 @@ def __repr__(self):
     if 'children' in props:
         prop_keys.remove('children')
         default_argtext = "children=None, "
-        # pylint: disable=unused-variable
         argtext = 'children=children, **args'
     else:
         default_argtext = ""
@@ -121,11 +94,20 @@ def __repr__(self):
          for p in prop_keys
          if not p.endswith("-*") and
          p not in python_keywords and
-         p != 'setProps'] + ['**kwargs']
+         p != 'setProps'] + ["**kwargs"]
     )
-
     required_args = required_props(props)
-    return c.format(**locals())
+    return c.format(
+        typename=typename,
+        namespace=namespace,
+        filtered_props=filtered_props,
+        list_of_valid_wildcard_attr_prefixes=wildcard_prefixes,
+        list_of_valid_keys=list_of_valid_keys,
+        docstring=docstring,
+        default_argtext=default_argtext,
+        argtext=argtext,
+        required_props=required_args
+    )
 
 
 def generate_class_file(typename, props, description, namespace):

dash/development/base_component.py

@@ -272,6 +272,35 @@ def __len__(self):
             length = 1
         return length
 
+    def __repr__(self):
+        # pylint: disable=no-member
+        props_with_values = [
+            c for c in self._prop_names
+            if getattr(self, c, None) is not None
+        ] + [
+            c for c in self.__dict__
+            if any(
+                c.startswith(wc_attr)
+                for wc_attr in self._valid_wildcard_attributes
+            )
+        ]
+        if any(
+                p != 'children'
+                for p in props_with_values
+        ):
+            props_string = ", ".join(
+                '{prop}={value}'.format(
+                    prop=p,
+                    value=repr(getattr(self, p))
+                ) for p in props_with_values
+            )
+        else:
+            props_string = repr(getattr(self, 'children', None))
+        return "{type}({props_string})".format(
+            type=self._type,
+            props_string=props_string
+        )
+
 
 def _explicitize_args(func):
     # Python 2

tests/development/metadata_test.py

@@ -55,26 +55,3 @@ def __init__(self, children=None, optionalArray=Component.UNDEFINED, optionalBoo
                 raise TypeError(
                     'Required argument `' + k + '` was not specified.')
         super(Table, self).__init__(children=children, **args)
-
-    def __repr__(self):
-        if(any(getattr(self, c, None) is not None
-               for c in self._prop_names
-               if c is not self._prop_names[0])
-           or any(getattr(self, c, None) is not None
-                  for c in self.__dict__.keys()
-                  if any(c.startswith(wc_attr)
-                  for wc_attr in self._valid_wildcard_attributes))):
-            props_string = ', '.join([c+'='+repr(getattr(self, c, None))
-                                      for c in self._prop_names
-                                      if getattr(self, c, None) is not None])
-            wilds_string = ', '.join([c+'='+repr(getattr(self, c, None))
-                                      for c in self.__dict__.keys()
-                                      if any([c.startswith(wc_attr)
-                                      for wc_attr in
-                                      self._valid_wildcard_attributes])])
-            return ('Table(' + props_string +
-                   (', ' + wilds_string if wilds_string != '' else '') + ')')
-        else:
-            return (
-                'Table(' +
-                repr(getattr(self, self._prop_names[0], None)) + ')')