Application case sharing of list in Python

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1. Application of list

(1) queue

Features: first in, first out

Usage scenarios: bank queue, inventory, seconds kill, queue for meals, callcenter

Append () + pop (0)

(2) Stack

Features: first in and then out

Usage scenario: get out of the elevator

Append () + pop ()

two。 Case list

Eg1: make a task list, using queue, FIFO, when the user enters do, start to do the task and pop up the done task.

Note: using the first-in-first-out principle, use the pop function of the list to delete pop (0) each time.

#! / usr/bin/pythontask = [] while True: task_name = input ("Please enter the name of the task you want to enter:") if task_name = = "do": if len (task) = 0: print ("Task is empty, exit the program") break else: print (task.pop (0)) else: task.append (task_name)

Execution result

Eg2: to find the intersection of two lists and remove the duplicates

Note: the method of determining whether an element is in the list is used

#! / usr/bin/pythonnum1 = [1, if i in num2, 5, 5, 6, 3] num2 = [3, 5, 5, 3] num3 = [] for i in num1: if i in num2: if i not in num3: num3.append (I) print (num3)

Execution result:

Eg3: sort a list with the largest number at the end

Note: you need an intermediate variable to store the larger one and then swap it.

#! / usr/bin/pythonnum = [1BI 6pm 4J 5J 10] I = 0j = 1while j

< len(num): if num[i] >

Num [j]: Z = num [I] num [I] = num [j] num [j] = z I + = 1 j + = 1 else: Z = num [j] I + = 1 j + = 1print (num)

Execution result:

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