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Lib/site-packages/django/utils/inspect.py

@@ -0,0 +1,63 @@
+import inspect
+
+
+def get_func_args(func):
+    sig = inspect.signature(func)
+    return [
+        arg_name for arg_name, param in sig.parameters.items()
+        if param.kind == inspect.Parameter.POSITIONAL_OR_KEYWORD
+    ]
+
+
+def get_func_full_args(func):
+    """
+    Return a list of (argument name, default value) tuples. If the argument
+    does not have a default value, omit it in the tuple. Arguments such as
+    *args and **kwargs are also included.
+    """
+    sig = inspect.signature(func)
+    args = []
+    for arg_name, param in sig.parameters.items():
+        name = arg_name
+        # Ignore 'self'
+        if name == 'self':
+            continue
+        if param.kind == inspect.Parameter.VAR_POSITIONAL:
+            name = '*' + name
+        elif param.kind == inspect.Parameter.VAR_KEYWORD:
+            name = '**' + name
+        if param.default != inspect.Parameter.empty:
+            args.append((name, param.default))
+        else:
+            args.append((name,))
+    return args
+
+
+def func_accepts_kwargs(func):
+    return any(
+        p for p in inspect.signature(func).parameters.values()
+        if p.kind == p.VAR_KEYWORD
+    )
+
+
+def func_accepts_var_args(func):
+    """
+    Return True if function 'func' accepts positional arguments *args.
+    """
+    return any(
+        p for p in inspect.signature(func).parameters.values()
+        if p.kind == p.VAR_POSITIONAL
+    )
+
+
+def method_has_no_args(meth):
+    """Return True if a method only accepts 'self'."""
+    count = len([
+        p for p in inspect.signature(meth).parameters.values()
+        if p.kind == p.POSITIONAL_OR_KEYWORD
+    ])
+    return count == 0 if inspect.ismethod(meth) else count == 1
+
+
+def func_supports_parameter(func, parameter):
+    return parameter in inspect.signature(func).parameters