Python中的dir和help

dir和help是Python中两个强大的built-in函数，就像Linux的man一样，绝对是开发的好帮手。比如查看list的所以属性:dir（list）输出：["__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"]
然后查看list的pop方法的作用和用法：help（list.pop）输出：Help on method_descriptor:pop（...）
L.pop（[index]） -> item -- remove and return item at index （default last）.
Raises IndexError if list is empty or index is out of range.
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