14 Basics of Python programming

Added elements of the list

L1 = [10, 20, 30]

L1.append (40) # appends an element with a value of 40 to the end

L1.extend ([50, 60]) # Appends a series of elements to the end, extend + iterates over an object

L1.insert (Len (L1), 70) # Inserts an element in the set subscript position, before the specified subscript

List of deleted elements

m = L1.pop () # Deletes an element without an input parameter, which defaults to deleting the last one and returning the deleted element value

Print (m) # 70

L1.pop (0) # Delete an element with the subscript 0 position

L1.remove (10) # remove elements with an element value of 10

L1.remover (1000) # If this value is not true, an error will be ValueError:list.remove (x): X not in List

L1.clear () # Empty list

L1 = [10, 20, 30]

List reversal

L1.reverse ()

L1 = [90, 30, 70, 20, 10, 60]

List sort

The list name. Sort (key,reverse) key indicates which function to sort by, whether the reverse is large or small

L1.sort (reverse = true) # from big to small

L1.sort (reverse = False) # Small to large

L1.sort () # No input parameters, default from small to large

Built-in function sorted (key,reverse)

L1 = sorted (L1, Reverse=true)

14 Basics of Python programming