From 0cfbd3c4646aa867b89da2aef16c3a0c693d0303 Mon Sep 17 00:00:00 2001
From: Daiki Shintani <35782950+dshintani404@users.noreply.github.com>
Date: Fri, 20 Jan 2023 02:20:49 +0900
Subject: DEP: deprecate np.finfo(None) (#23011)

Deprecate np.finfo(None), it may be that we should more generally deprecate `np.dtype(None)` but this is a start and particularly weird maybe.

Closes gh-14684
---
 numpy/core/getlimits.py | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'numpy/core/getlimits.py')

diff --git a/numpy/core/getlimits.py b/numpy/core/getlimits.py
index 5baeb97fe..8146c4644 100644
--- a/numpy/core/getlimits.py
+++ b/numpy/core/getlimits.py
@@ -471,6 +471,15 @@ class finfo:
     _finfo_cache = {}
 
     def __new__(cls, dtype):
+        if dtype is None:
+            # Deprecated in NumPy 1.25, 2023-01-16
+            warnings.warn(
+                "finfo() dtype cannot be None. This behavior will "
+                "raise an error in the future. (Deprecated in NumPy 1.25)",
+                DeprecationWarning,
+                stacklevel=2
+            )
+
         try:
             dtype = numeric.dtype(dtype)
         except TypeError:
-- 
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