reflect.py 文件源码

def macro(name, filename, source, **identifiers):
    """macro(name, source, **identifiers)

    This allows you to create macro-like behaviors in python.  See
    twisted.python.hook for an example of its usage.
    """
    if not identifiers.has_key('name'):
        identifiers['name'] = name
    source = source % identifiers
    codeplace = "<%s (macro)>" % filename
    code = compile(source, codeplace, 'exec')

    # shield your eyes!
    sm = sys.modules
    tprm = "twisted.python.reflect.macros"
    if not sm.has_key(tprm):
        macros = new.module(tprm)
        sm[tprm] = macros
        macros.count = 0
    macros = sm[tprm]
    macros.count += 1
    macroname = 'macro_' + str(macros.count)
    tprmm = tprm + '.' + macroname
    mymod = new.module(tprmm)
    sys.modules[tprmm] = mymod
    setattr(macros, macroname, mymod)
    dict = mymod.__dict__

    # Before we go on, I guess I should explain why I just did that.  Basically
    # it's a gross hack to get epydoc to work right, but the general idea is
    # that it will be a useful aid in debugging in _any_ app which expects
    # sys.modules to have the same globals as some function.  For example, it
    # would be useful if you were foolishly trying to pickle a wrapped function
    # directly from a class that had been hooked.

    exec code in dict, dict
    return dict[name]