python中的{}和[]有什么区别?
问题描述：
python中columnNames = {}和columnNames = []有什么区别?
What is the difference between columnNames = {} and columnNames = [] in python?
我如何迭代每一个?使用 {% for value in columnNames %} OR for idx_o, val_o in enumerate(columnNames):
How can i iterate each one? using {% for value in columnNames %} OR for idx_o, val_o in enumerate(columnNames):
答
-
columnNames = {}定义一个空的dict -
columnNames = []定义一个空的list -
columnNames = {}defines an emptydict -
columnNames = []defines an emptylist
这些是根本不同的类型.dict 是一个 关联数组，一个 list 是一个带有整数索引的标准数组.
These are fundamentally different types. A dict is an associative array, a list is a standard array with integral indices.
我建议您查阅参考资料，以更加熟悉这两种非常重要的 Python 容器类型.
I recommend you consult your reference material to become more familiar with these two very important Python container types.