From d4535dab4f4b72fe82e90f3ddc78e49e8ed3c0a2 Mon Sep 17 00:00:00 2001
From: "David R. MacIver" <david@drmaciver.com>
Date: Fri, 11 Oct 2024 11:25:35 +0100
Subject: [PATCH] Don't include no-init fields in pretty printing

---
 .../src/hypothesis/vendor/pretty.py           |  8 ++++--
 hypothesis-python/tests/cover/test_pretty.py  | 28 ++++++++++++++++++-
 2 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/hypothesis-python/src/hypothesis/vendor/pretty.py b/hypothesis-python/src/hypothesis/vendor/pretty.py
index 2f85bf6c4d..8501d5d827 100644
--- a/hypothesis-python/src/hypothesis/vendor/pretty.py
+++ b/hypothesis-python/src/hypothesis/vendor/pretty.py
@@ -219,14 +219,18 @@ def pretty(self, obj):
                                     obj,
                                     self,
                                     cycle,
-                                    [at.name for at in cls.__attrs_attrs__],
+                                    [at.name for at in cls.__attrs_attrs__ if at.init],
                                 )
                             if hasattr(cls, "__dataclass_fields__"):
                                 return pprint_fields(
                                     obj,
                                     self,
                                     cycle,
-                                    list(cls.__dataclass_fields__),
+                                    [
+                                        k
+                                        for k, v in cls.__dataclass_fields__.items()
+                                        if v.init
+                                    ],
                                 )
                 # Now check for object-specific printers which show how this
                 # object was constructed (a Hypothesis special feature).
diff --git a/hypothesis-python/tests/cover/test_pretty.py b/hypothesis-python/tests/cover/test_pretty.py
index 64c412034e..9178c98f87 100644
--- a/hypothesis-python/tests/cover/test_pretty.py
+++ b/hypothesis-python/tests/cover/test_pretty.py
@@ -51,7 +51,7 @@
 import struct
 import warnings
 from collections import Counter, OrderedDict, defaultdict, deque
-from dataclasses import dataclass
+from dataclasses import dataclass, field
 from enum import Enum, Flag
 from functools import partial
 
@@ -846,3 +846,29 @@ def test_handles_cycles_in_dataclass():
     x.x = x
 
     assert pretty.pretty(x) == "SomeDataClass(x=SomeDataClass(...))"
+
+
+@dataclass
+class DataClassWithNoInitField:
+    x: int
+    y: int = field(init=False)
+
+
+def test_does_not_include_no_init_fields_in_dataclass_printing():
+    record = DataClassWithNoInitField(x=1)
+    assert pretty.pretty(record) == "DataClassWithNoInitField(x=1)"
+    record.y = 1
+    assert pretty.pretty(record) == "DataClassWithNoInitField(x=1)"
+
+
+@attrs.define
+class AttrsClassWithNoInitField:
+    x: int
+    y: int = attrs.field(init=False)
+
+
+def test_does_not_include_no_init_fields_in_attrs_printing():
+    record = AttrsClassWithNoInitField(x=1)
+    assert pretty.pretty(record) == "AttrsClassWithNoInitField(x=1)"
+    record.y = 1
+    assert pretty.pretty(record) == "AttrsClassWithNoInitField(x=1)"