required children prop

dash/development/_py_components_generation.py

@@ -65,11 +65,14 @@ def __init__(self, {default_argtext}):
         _explicit_args = kwargs.pop('_explicit_args')
         _locals = locals()
         _locals.update(kwargs)  # For wildcard attrs and excess named props
-        args = {{k: _locals[k] for k in _explicit_args if k != 'children'}}
+        args = {args}
         for k in {required_props}:
             if k not in args:
                 raise TypeError(
                     'Required argument `' + k + '` was not specified.')
+        if 'children' in {required_props} and 'children' not in _explicit_args:
+            raise TypeError(
+                    'Required argument children was not specified.')
         super({typename}, self).__init__({argtext})
 '''
 
@@ -92,12 +95,14 @@ def __init__(self, {default_argtext}):
 
     # pylint: disable=unused-variable
     prop_keys = list(props.keys())
-    if "children" in props:
+    if "children" in props and "children" in list_of_valid_keys:
         prop_keys.remove("children")
         default_argtext = "children=None, "
+        args = "{k: _locals[k] for k in _explicit_args if k != 'children'}"
         argtext = "children=children, **args"
     else:
         default_argtext = ""
+        args = "{k: _locals[k] for k in _explicit_args}"
         argtext = "**args"
     default_arglist = [
         (
@@ -131,6 +136,7 @@ def __init__(self, {default_argtext}):
         list_of_valid_keys=list_of_valid_keys,
         docstring=docstring,
         default_argtext=default_argtext,
+        args=args,
         argtext=argtext,
         required_props=required_args,
         children_props=nodes,

dash/testing/application_runners.py

@@ -13,6 +13,7 @@
 import runpy
 import requests
 import psutil
+
 # pylint: disable=no-member
 import multiprocess
 
@@ -216,7 +217,7 @@ def __init__(self, keep_open=False, stop_timeout=3):
 
     # pylint: disable=arguments-differ
     def start(self, app, start_timeout=3, **kwargs):
-        self.port = kwargs.get('port', 8050)
+        self.port = kwargs.get("port", 8050)
 
         def target():
             app.scripts.config.serve_locally = True

tests/integration/devtools/test_hot_reload.py

@@ -88,7 +88,8 @@ def new_text(n):
 
     try:
         until(
-            lambda: dash_duo_mp.driver.execute_script("return window.cheese") == "gouda",
+            lambda: dash_duo_mp.driver.execute_script("return window.cheese")
+            == "gouda",
             timeout=10,
         )
     finally:
@@ -97,7 +98,8 @@ def new_text(n):
             f.write(old_hard)
 
     until(
-        lambda: dash_duo_mp.driver.execute_script("return window.cheese") == "roquefort",
+        lambda: dash_duo_mp.driver.execute_script("return window.cheese")
+        == "roquefort",
         timeout=10,
     )
 

tests/integration/renderer/test_component_as_prop.py

@@ -102,7 +102,7 @@ def test_rdcap001_component_as_prop(dash_duo):
                         "id": "multi2",
                         "first": Span("foo"),
                         "second": Span("bar"),
-                    }
+                    },
                 ],
             ),
         ]