add cp437 aliases

Author: timfel

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/CodecsModuleBuiltins.java

@@ -131,6 +131,10 @@ public class CodecsModuleBuiltins extends PythonBuiltins {
         // cp037 IBM037, IBM039 English
         // cp424 EBCDIC-CP-HE, IBM424 Hebrew
         // cp437 437, IBM437 English
+        PY_CODECS_ALIASES.put("IBM437", "IBM437");
+        PY_CODECS_ALIASES.put("IBM437 English", "IBM437");
+        PY_CODECS_ALIASES.put("437", "IBM437");
+        PY_CODECS_ALIASES.put("cp437", "IBM437");
         // cp500 EBCDIC-CP-BE, EBCDIC-CP-CH, IBM500 Western Europe
         // cp720 Arabic
         // cp737 Greek

graalpython/lib-graalpython/_codecs.py

@@ -287,12 +287,12 @@ def ascii_decode(string, errors=None):
 
 @__builtin__
 def charmap_encode(string, errors=None, mapping=None):
-    raise NotImplementedError("charmap_encode")
+    return __truffle_encode(string, "cp437", errors)
 
 
 @__builtin__
 def charmap_decode(string, errors=None, mapping=None):
-    raise NotImplementedError("charmap_decode")
+    return __truffle_decode(string, "cp437", errors)
 
 
 @__builtin__