Python List of list-

Python list

The list is the most frequently used data type in Python.

A list can accomplish the data structure implementation of most collection classes. It supports characters, numbers, and strings that can even contain lists (that is, nesting).

The list is identified by [], which is the most common type of composite data for Python.

The cut of the value in the list can also be used to the variable [head subscript: Tail subscript], you can intercept the corresponding list, from left to right index default 0, starting from right to left index default-1, subscript can be empty to take the head or tail.

Inline Functions

Example Analysis:

1. Add a new object at the end of the list

li=[One,one,one,'aa','bb','  cc'] li.append ('dd') print (LI)

2. Insert an element before the specified index position

li=[One,one,one,'aa','bb','  cc']li.insert (3,'+ ') Print (LI)

3. Deleting an element

li=[One,one,one,'aa','bb','  cc'] del li[5]print (LI)

4. Popup Elements

li=[ One, A, -,'AA','BB','cc'] Li.pop () #默认是栈顶元素print (LI) Li=[ One, A, -,'AA','BB','cc'] Li.pop (0) #指定元素值print (LI)

5. Delete the value element (without knowing the location, but knowing the value)

li=[One,one,one,'aa','bb','  cc']li.remove ('cc') print (LI)

6. Permanent sorting by letter

li=[, and]li.  Sort ()  #永久排序print (li) Li=[,]sorted (LI)  # Temporary sort print (LI)

7. List reversal

li=[,]li.reverse () #反向列表永久print (LI) Li=[one by One, ]list,reversed (li) #反向列表暂时print (Li )

8. Return the list length

li=[,]len (li) 

9. Clear the list

li=[, and]li.  Clear () print (LI)

10. Copy the list

li=[,]ri=li.copy () print (RI) 

11. Returns the number of specified elements in the list

li=[One,one, one,one]li.count (one)

12. Append sequence B at the end of the list

li=[,]b=['aa', ' BB ' ]li.extend (B) print (RI)

13. Returns the first position of a specified element in a list

li=[One,one, one,one]li.index (one)

14. Specify whether the element returns a bool value in the list

li=[One,one,one,one, one in litrue

Python List of list-