38.2. "aetools" — OSA client support
************************************

The "aetools" module contains the basic functionality on which Python
AppleScript client support is built. It also imports and re-exports
the core functionality of the "aetypes" and "aepack" modules. The stub
packages generated by "gensuitemodule" import the relevant portions of
"aetools", so usually you do not need to import it yourself. The
exception to this is when you cannot use a generated suite package and
need lower-level access to scripting.

The "aetools" module itself uses the AppleEvent support provided by
the "Carbon.AE" module. This has one drawback: you need access to the
window manager, see section Running scripts with a GUI for details.
This restriction may be lifted in future releases.

注解: This module has been removed in Python 3.x.

The "aetools" module defines the following functions:

aetools.packevent(ae, parameters, attributes)

   Stores parameters and attributes in a pre-created
   "Carbon.AE.AEDesc" object. "parameters" and "attributes" are
   dictionaries mapping 4-character OSA parameter keys to Python
   objects. The objects are packed using "aepack.pack()".

aetools.unpackevent(ae[, formodulename])

   Recursively unpacks a "Carbon.AE.AEDesc" event to Python objects.
   The function returns the parameter dictionary and the attribute
   dictionary. The "formodulename" argument is used by generated stub
   packages to control where AppleScript classes are looked up.

aetools.keysubst(arguments, keydict)

   Converts a Python keyword argument dictionary "arguments" to the
   format required by "packevent" by replacing the keys, which are
   Python identifiers, by the four-character OSA keys according to the
   mapping specified in "keydict". Used by the generated suite
   packages.

aetools.enumsubst(arguments, key, edict)

   If the "arguments" dictionary contains an entry for "key" convert
   the value for that entry according to dictionary "edict". This
   converts human-readable Python enumeration names to the OSA
   4-character codes. Used by the generated suite packages.

The "aetools" module defines the following class:

class aetools.TalkTo([signature=None, start=0, timeout=0])

   Base class for the proxy used to talk to an application.
   "signature" overrides the class attribute "_signature" (which is
   usually set by subclasses) and is the 4-char creator code defining
   the application to talk to. "start" can be set to true to enable
   running the application on class instantiation. "timeout" can be
   specified to change the default timeout used while waiting for an
   AppleEvent reply.

TalkTo._start()

   Test whether the application is running, and attempt to start it if
   not.

TalkTo.send(code, subcode[, parameters, attributes])

   Create the AppleEvent "Carbon.AE.AEDesc" for the verb with the OSA
   designation "code, subcode" (which are the usual 4-character
   strings), pack the "parameters" and "attributes" into it, send it
   to the target application, wait for the reply, unpack the reply
   with "unpackevent" and return the reply appleevent, the unpacked
   return values as a dictionary and the return attributes.
