Is there a way to append/extend a list with another list at a specific index in python? -

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In other words, I want to complete something like the following: 

  a = [1, 2, 3, 7, 8] B = [4, 5, 6] # There is a list on index 3 to include List B in some magic lists so that one = [1, 2, 3, 4, 5, 6, 7, 8]

you type a Only: 

  & gt; & Gt; & Gt; A = [1, 2, 3, 7, 8] & gt; & Gt; & Gt; B = [4, 5, 6]> gt; & Gt; & Gt; A [3: 3] = B & gt; & Gt; & Gt; A [1, 2, 3, 4, 5, 6, 7, 8] & gt; & Gt; & Gt;   
  [3: 3]  may seem strange, but it is necessary to enter the item  b  in the list  one < / Code> Otherwise, if we are assigned an index of  a , list  b , then it will be inserted: 
 
  & Gt; & Gt; & Gt; A = [1, 2, 3, 7, 8] & gt; & Gt; & Gt; B = [4, 5, 6]> gt; & Gt; & Gt; A [3] = B & gt; & Gt; & Gt; A [1, 2, 3, [4, 5, 6], 8]> gt; & Gt; & Gt;  
 
 
 I tried to find a docs link that explicitly mentions this behavior, but fail (if you can find it, feel free to add one Please). So, I would just say that  a [3: 3] = b  tells the dragon to move the list to the item  b  and put it in the list section  is represented by a  by  [3: 3] . In addition, the dragon will expand the list of  a  needed to adjust this operation. 
 
 In short, this is just another awesome feature of Python. :)

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