test_warnings.py 文件源码

def test_single_warning(self):
        newenv = os.environ.copy()
        newenv["PYTHONWARNINGS"] = "ignore::DeprecationWarning"
        p = subprocess.Popen([sys.executable,
                "-c", "import sys; sys.stdout.write(str(sys.warnoptions))"],
                stdout=subprocess.PIPE, env=newenv)
        self.assertEqual(p.communicate()[0], b"['ignore::DeprecationWarning']")
        self.assertEqual(p.wait(), 0)