Import _collections_abc dynamically

Author: srittau

Lib/io.py

@@ -53,7 +53,6 @@
 import _io
 import abc
 
-from _collections_abc import _check_methods
 from _io import (DEFAULT_BUFFER_SIZE, BlockingIOError, UnsupportedOperation,
                  open, open_code, FileIO, BytesIO, StringIO, BufferedReader,
                  BufferedWriter, BufferedRWPair, BufferedRandom,
@@ -123,6 +122,7 @@ def read(self, size: int = ..., /) -> T:
 
     @classmethod
     def __subclasshook__(cls, C):
+        from _collections_abc import _check_methods
         if cls is Reader:
             return _check_methods(C, "read")
         return NotImplemented
@@ -142,6 +142,7 @@ def write(self, data: T, /) -> int:
 
     @classmethod
     def __subclasshook__(cls, C):
+        from _collections_abc import _check_methods
         if cls is Writer:
             return _check_methods(C, "write")
         return NotImplemented