Issue #18200: Update the stdlib (except tests) to use
ModuleNotFoundError.
diff --git a/Lib/json/encoder.py b/Lib/json/encoder.py
index 39b550d..3fa90bd 100644
--- a/Lib/json/encoder.py
+++ b/Lib/json/encoder.py
@@ -4,11 +4,11 @@
 
 try:
     from _json import encode_basestring_ascii as c_encode_basestring_ascii
-except ImportError:
+except ModuleNotFoundError:
     c_encode_basestring_ascii = None
 try:
     from _json import make_encoder as c_make_encoder
-except ImportError:
+except ModuleNotFoundError:
     c_make_encoder = None
 
 ESCAPE = re.compile(r'[\x00-\x1f\\"\b\f\n\r\t]')