Merge pull request #3934 from Zac-HD/remove-skips

Work around weird lambda issue by popping entry from `linecache`

hypothesis-python/RELEASE.rst

@@ -0,0 +1,6 @@
+RELEASE_TYPE: patch
+
+If you were running Python 3.13 (currently in alpha) with :pypi:`pytest-xdist`
+and then attempted to pretty-print a ``lambda`` functions which was created
+using the :func:`eval` builtin, it would have raised an AssertionError.
+Now you'll get ``"lambda ...: <unknown>"``, as expected.

hypothesis-python/src/hypothesis/internal/reflection.py

@@ -14,6 +14,7 @@
 import ast
 import hashlib
 import inspect
+import linecache
 import os
 import re
 import sys
@@ -315,6 +316,10 @@ def extract_lambda_source(f):
     sig = inspect.signature(f)
     assert sig.return_annotation in (inspect.Parameter.empty, None), sig
 
+    # Using pytest-xdist on Python 3.13, there's an entry in the linecache for
+    # file "<string>", which then returns nonsense to getsource.  Discard it.
+    linecache.cache.pop("<string>", None)
+
     if sig.parameters:
         if_confused = f"lambda {str(sig)[1:-1]}: <unknown>"
     else:
@@ -329,7 +334,7 @@ def extract_lambda_source(f):
     source = source.strip()
     if "lambda" not in source and sys.platform == "emscripten":  # pragma: no cover
         return if_confused  # work around Pyodide bug in inspect.getsource()
-    assert "lambda" in source
+    assert "lambda" in source, source
 
     tree = None
 

hypothesis-python/tests/cover/test_filter_rewriting.py

@@ -12,7 +12,6 @@
 import math
 import operator
 import re
-import sys
 from fractions import Fraction
 from functools import partial
 from sys import float_info
@@ -35,10 +34,6 @@
 
 A_FEW = 15  # speed up massively-parametrized tests
 
-# FIXME-3.13: something about get_lambda_source not working with pytest-xdist?
-if sys.version_info[:2] == (3, 13) and sys.version_info.releaselevel < "final":
-    pytest.skip(allow_module_level=True)
-
 
 @pytest.mark.parametrize(
     "strategy, predicate, start, end",

hypothesis-python/tests/cover/test_lambda_formatting.py

@@ -8,18 +8,13 @@
 # v. 2.0. If a copy of the MPL was not distributed with this file, You can
 # obtain one at https://mozilla.org/MPL/2.0/.
 
-import sys
-
-import pytest
-
 from hypothesis.internal.reflection import get_pretty_function_description
 
 
 def test_bracket_whitespace_is_striped():
     assert get_pretty_function_description(lambda x: (x + 1)) == "lambda x: (x + 1)"
 
 
-@pytest.mark.skipif(sys.version_info[:2] == (3, 13), reason="FIXME-3.13")
 def test_no_whitespace_before_colon_with_no_args():
     assert get_pretty_function_description(eval("lambda: None")) == "lambda: <unknown>"
 
@@ -63,7 +58,6 @@ def test_variable_names_are_not_pretty():
     assert get_pretty_function_description(t) == "lambda x: True"
 
 
-@pytest.mark.skipif(sys.version_info[:2] == (3, 13), reason="FIXME-3.13")
 def test_does_not_error_on_dynamically_defined_functions():
     x = eval("lambda t: 1")
     get_pretty_function_description(x)