Remove legacy imports from IPython integration since the "py3compat" module...

Remove legacy imports from IPython integration since the "py3compat" module changed in IPython 7.11. (GH-3297)

Cython/Build/IpythonMagic.py

@@ -56,6 +56,8 @@ import copy
 import distutils.log
 import textwrap
 
+IO_ENCODING = sys.getfilesystemencoding()
+IS_PY2 = sys.version_info[0] < 3
 
 try:
     reload
@@ -73,7 +75,6 @@ from distutils.command.build_ext import build_ext
 from IPython.core import display
 from IPython.core import magic_arguments
 from IPython.core.magic import Magics, magics_class, cell_magic
-from IPython.utils import py3compat
 try:
     from IPython.paths import get_ipython_cache_dir
 except ImportError:
@@ -101,6 +102,14 @@ PGO_CONFIG = {
 PGO_CONFIG['mingw32'] = PGO_CONFIG['gcc']
 
 
+if IS_PY2:
+    def encode_fs(name):
+        return name if isinstance(name, bytes) else name.encode(IO_ENCODING)
+else:
+    def encode_fs(name):
+        return name
+
+
 @magics_class
 class CythonMagics(Magics):
 
@@ -306,7 +315,7 @@ class CythonMagics(Magics):
             key += (time.time(),)
 
         if args.name:
-            module_name = py3compat.unicode_to_str(args.name)
+            module_name = str(args.name)  # no-op in Py3
         else:
             module_name = "_cython_magic_" + hashlib.md5(str(key).encode('utf-8')).hexdigest()
         html_file = os.path.join(lib_dir, module_name + '.html')
@@ -406,7 +415,7 @@ class CythonMagics(Magics):
 
     def _cythonize(self, module_name, code, lib_dir, args, quiet=True):
         pyx_file = os.path.join(lib_dir, module_name + '.pyx')
-        pyx_file = py3compat.cast_bytes_py2(pyx_file, encoding=sys.getfilesystemencoding())
+        pyx_file = encode_fs(pyx_file)
 
         c_include_dirs = args.include
         c_src_files = list(map(str, args.src))
@@ -526,10 +535,10 @@ class CythonMagics(Magics):
         build_extension = _build_ext(dist)
         build_extension.finalize_options()
         if temp_dir:
-            temp_dir = py3compat.cast_bytes_py2(temp_dir, encoding=sys.getfilesystemencoding())
+            temp_dir = encode_fs(temp_dir)
             build_extension.build_temp = temp_dir
         if lib_dir:
-            lib_dir = py3compat.cast_bytes_py2(lib_dir, encoding=sys.getfilesystemencoding())
+            lib_dir = encode_fs(lib_dir)
             build_extension.build_lib = lib_dir
         if extension is not None:
             build_extension.extensions = [extension]

Cython/Build/Tests/TestIpythonMagic.py

@@ -13,15 +13,8 @@ from Cython.TestUtils import CythonTest
 
 try:
     import IPython.testing.globalipapp
-    from IPython.utils import py3compat
 except ImportError:
     # Disable tests and fake helpers for initialisation below.
-    class _py3compat(object):
-        def str_to_unicode(self, s):
-            return s
-
-    py3compat = _py3compat()
-
     def skip_if_not_installed(_):
         return None
 else:
@@ -35,24 +28,24 @@ try:
 except ImportError:
     pass
 
-code = py3compat.str_to_unicode("""\
+code = u"""\
 def f(x):
     return 2*x
-""")
+"""
 
-cython3_code = py3compat.str_to_unicode("""\
+cython3_code = u"""\
 def f(int x):
     return 2 / x
 
 def call(x):
     return f(*(x,))
-""")
+"""
 
-pgo_cython3_code = cython3_code + py3compat.str_to_unicode("""\
+pgo_cython3_code = cython3_code + u"""\
 def main():
     for _ in range(100): call(5)
 main()
-""")
+"""
 
 
 if sys.platform == 'win32':
@@ -161,10 +154,10 @@ class TestIPythonMagic(CythonTest):
     @skip_win32('Skip on Windows')
     def test_extlibs(self):
         ip = self._ip
-        code = py3compat.str_to_unicode("""
+        code = u"""
 from libc.math cimport sin
 x = sin(0.0)
-        """)
+        """
         ip.user_ns['x'] = 1
         ip.run_cell_magic('cython', '-l m', code)
         self.assertEqual(ip.user_ns['x'], 0)