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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def getargs(obj):
 """Get the names and default values of a function's arguments"""

    if inspect.isfunction(obj) or inspect.isbuiltin(obj):
        func_obj = obj
    elif inspect.ismethod(obj):
        func_obj = get_meth_func(obj)
    elif inspect.isclass(obj) and hasattr(obj, '__init__'):
        func_obj = getattr(obj, '__init__')
    else:
        return []
    if not hasattr(func_obj, 'func_code'):
        # Builtin: try to extract info from doc
        args = getargsfromdoc(func_obj)
        if args is not None:
            return args
        else:
            # Example: PyQt5
            return getargsfromdoc(obj)
    args, _, _ = inspect.getargs(func_obj.func_code)
    if not args:
        return getargsfromdoc(obj)
    
    # Supporting tuple arguments in def statement:
    for i_arg, arg in enumerate(args):
        if isinstance(arg, list):
            args[i_arg] = "(%s)" % ", ".join(arg)
            
    defaults = get_func_defaults(func_obj)
    if defaults is not None:
        for index, default in enumerate(defaults):
            args[index+len(args)-len(defaults)] += '='+repr(default)
    if inspect.isclass(obj) or inspect.ismethod(obj):
        if len(args) == 1:
            return None
        if 'self' in args:
            args.remove('self')
    return args