Python 打印目录（XXX）给出空白属性

简言之，我使用一个xlsx文件，在使用print diralist检查一些列表时，获取空白属性

neglist = neglist.tolist()

此时，我想检查evth是否正常：

def check_variab (variab):
    print "The type is %s" % type(variab)
    print "Its length = %i" % len(variab)
    print "Its attributes are:" % dir(variab)

print 'neglist'
check_variab(neglist)

但我得到的是：

type: list
length: 19
attributes: 

没有打印属性，尽管类型是list ok，其长度和内容是ok

有人能解释一下为什么会发生这种情况吗？

您忘了使用%s占位符，因此不会插入任何内容。添加%s或%r:

如果没有占位符，您将看不到任何内容，事实上：

>>> variab = ['foo', 'bar']
>>> dir(variab)
['__add__', '__class__', '__contains__', '__delattr__', '__delitem__', '__delslice__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__getslice__', '__gt__', '__hash__', '__iadd__', '__imul__', '__init__', '__iter__', '__le__', '__len__', '__lt__', '__mul__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__reversed__', '__rmul__', '__setattr__', '__setitem__', '__setslice__', '__sizeof__', '__str__', '__subclasshook__', 'append', 'count', 'extend', 'index', 'insert', 'pop', 'remove', 'reverse', 'sort']
>>> print "Its attributes are:" % dir(variab)
Its attributes are:
>>> print "Its attributes are %s:" % dir(variab)
Its attributes are ['__add__', '__class__', '__contains__', '__delattr__', '__delitem__', '__delslice__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__getslice__', '__gt__', '__hash__', '__iadd__', '__imul__', '__init__', '__iter__', '__le__', '__len__', '__lt__', '__mul__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__reversed__', '__rmul__', '__setattr__', '__setitem__', '__setslice__', '__sizeof__', '__str__', '__subclasshook__', 'append', 'count', 'extend', 'index', 'insert', 'pop', 'remove', 'reverse', 'sort']:

---

您想在列表中使用。

您的输出是文本，请不要使用屏幕截图，复制文本并粘贴到此处。在Windows控制台中，[-]窗口菜单具有可在此处使用的复制控件。请原谅我的愚蠢，[-]窗口菜单是什么？老实说，我试图找到它，但失败了…它是所有窗口上的默认窗口菜单；现在右键单击菜单栏时，菜单似乎已更改为显示的菜单。我真丢脸！谢谢

>>> variab = ['foo', 'bar']
>>> dir(variab)
['__add__', '__class__', '__contains__', '__delattr__', '__delitem__', '__delslice__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__getslice__', '__gt__', '__hash__', '__iadd__', '__imul__', '__init__', '__iter__', '__le__', '__len__', '__lt__', '__mul__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__reversed__', '__rmul__', '__setattr__', '__setitem__', '__setslice__', '__sizeof__', '__str__', '__subclasshook__', 'append', 'count', 'extend', 'index', 'insert', 'pop', 'remove', 'reverse', 'sort']
>>> print "Its attributes are:" % dir(variab)
Its attributes are:
>>> print "Its attributes are %s:" % dir(variab)
Its attributes are ['__add__', '__class__', '__contains__', '__delattr__', '__delitem__', '__delslice__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__getslice__', '__gt__', '__hash__', '__iadd__', '__imul__', '__init__', '__iter__', '__le__', '__len__', '__lt__', '__mul__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__reversed__', '__rmul__', '__setattr__', '__setitem__', '__setslice__', '__sizeof__', '__str__', '__subclasshook__', 'append', 'count', 'extend', 'index', 'insert', 'pop', 'remove', 'reverse', 'sort']: