CallTips.py 文件源码

def get_arg_text(ob):
    """Get a string describing the arguments for the given object,
       only if it is callable."""
    arg_text = ""
    if ob is not None and hasattr(ob, '__call__'):
        arg_offset = 0
        if type(ob) in (types.ClassType, types.TypeType):
            # Look for the highest __init__ in the class chain.
            fob = _find_constructor(ob)
            if fob is None:
                fob = lambda: None
            else:
                arg_offset = 1
        elif type(ob)==types.MethodType:
            # bit of a hack for methods - turn it into a function
            # but we drop the "self" param.
            fob = ob.im_func
            arg_offset = 1
        else:
            fob = ob
        # Try to build one for Python defined functions
        if type(fob) in [types.FunctionType, types.LambdaType]:
            argcount = fob.func_code.co_argcount
            real_args = fob.func_code.co_varnames[arg_offset:argcount]
            defaults = fob.func_defaults or []
            defaults = list(map(lambda name: "=%s" % repr(name), defaults))
            defaults = [""] * (len(real_args) - len(defaults)) + defaults
            items = map(lambda arg, dflt: arg + dflt, real_args, defaults)
            if fob.func_code.co_flags & 0x4:
                items.append("...")
            if fob.func_code.co_flags & 0x8:
                items.append("***")
            arg_text = ", ".join(items)
            arg_text = "(%s)" % re.sub("\.\d+", "<tuple>", arg_text)
        # See if we can use the docstring
        doc = getattr(ob, "__doc__", "")
        if doc:
            doc = doc.lstrip()
            pos = doc.find("\n")
            if pos < 0 or pos > 70:
                pos = 70
            if arg_text:
                arg_text += "\n"
            arg_text += doc[:pos]
    return arg_text

#################################################
#
# Test code
#