Make error messages more consistent

Author: bryanforbes

asyncpg/mypy/hooks.py

@@ -47,8 +47,13 @@ def record_getitem(ctx: mypy.plugin.MethodContext) \
                 name = value
 
             if name is None:
-                ctx.api.fail('Unexpected key "{}" for record "{}'
-                             .format(value, ctx.type.type.name),
+                is_int = isinstance(value, int)
+                formatted_key = value if is_int else \
+                    "'{}'".format(value)
+                ctx.api.fail('Record "{}" has no {} {}'
+                             .format(ctx.type.type.name,
+                                     'index' if is_int else 'key',
+                                     formatted_key),
                              ctx.context)
             else:
                 node = ctx.type.type.get(name)
@@ -79,8 +84,8 @@ def record_get(ctx: mypy.plugin.MethodContext) \
                 name = value
 
             if name is None:
-                ctx.api.fail('Unexpected key "{}" for record "{}'
-                             .format(value, ctx.type.type.name),
+                ctx.api.fail('Record "{}" has no key \'{}\''
+                             .format(ctx.type.type.name, value),
                              ctx.context)
             else:
                 node = ctx.type.type.get(name)