Comparison of range() function and list in Python

The following is a comparison of the range() function and list in Python. It has a good reference value and I hope it will be helpful to everyone. Let’s take a look together

Everyone who uses Python knows that the range() function and list are very convenient. When I used it again today, I discovered a lot of details that I had seen before but had forgotten. Record range() and list here.

>>> range(1,5) #代表从1到5(不包含5) 
[1, 2, 3, 4] 
>>> range(1,5,2) #代表从1到5，间隔2(不包含5) 
[1, 3] 
>>> range(5)  #代表从0到5(不包含5) 
[0, 1, 2, 3, 4]

Look at the list operation again:

array = [1, 2, 5, 3, 6, 8, 4] 
#其实这里的顺序标识是 
[1, 2, 5, 3, 6, 8, 4] 
(0，1，2，3，4，5，6) 
(-7,-6,-5,-4,-3,-2,-1) 
 
>>> array[0:] #列出0以后的 
[1, 2, 5, 3, 6, 8, 4] 
>>> array[1:] #列出1以后的 
[2, 5, 3, 6, 8, 4] 
>>> array[:-1] #列出-1之前的 
[1, 2, 5, 3, 6, 8] 
>>> array[3:-3] #列出3到-3之间的 
[3]

#那么两个[::]会是什么那？
>>> array[::2] 
[1, 5, 6, 4] 
>>> array[2::] 
[5, 3, 6, 8, 4] 
>>> array[::3] 
[1, 3, 4] 
>>> array[::4] 
[1, 6]

#如果想让他们颠倒形成reverse函数的效果 
>>> array[::-1] 
[4, 8, 6, 3, 5, 2, 1] 
>>> array[::-2] 
[4, 6, 5, 1]

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