Managing thirdparty package: defer.

thirdparty/defer/defer.py

@@ -0,0 +1,23 @@
+import sys
+from typing import Any, Callable, ParamSpec, TypeVar
+
+from defer._defer import _Defer
+from defer.sugar._parse import _ParseDefer
+
+P = ParamSpec("P")
+T = TypeVar("T")
+
+
+class Defer:
+    def __call__(self, fn: Callable[P, T], *args: P.args, **kwargs: P.kwargs):
+        if sys.gettrace() is None:
+            sys.settrace(_ParseDefer.IDENTITY)
+        frame = sys._getframe(1)
+        if not isinstance(frame.f_trace, _Defer):
+            frame.f_trace = _Defer(frame.f_trace)
+        frame.f_trace.push(fn, *args, **kwargs)
+        frame.f_trace_lines = False
+
+    def __contains__(self, fn: Any):
+        breakpoint()
+        self(fn)