题目一(输出国际象棋棋盘) 分析: 用i控制行,j来控制列,根据i+j的和的变化来控制输出黑方格,还是白方格. 主要代码: for i in range(8): for j in range(8): if (i+j)%2!=0: print(chr(219)*2,end='') else: print(' ',end='') print('') 题目二(排列组合问题) 有1.2.3.4个数字,能组成多少个互不相同且无重复数字的四位数?都是多少? 分析: 我们可以先预测一下,共有2…
python3 turtle 画国际象棋棋盘 #!/usr/bin/env python # -*- coding:utf-8 -*- # Author:Hiuhung Wan import turtle n = 60 # 每行间隔 x = -300 # x初始值 y = -300 # x初始值 turtle.speed(11) turtle.pensize(2) # 先画8*8的正方形,并按要求涂黑 for i in range(8): for j in range(1, 9): turtle…
如下的资料是关于python从任意文件读取邮件地址输出的代码. # This script takes whatever you throw at stdin and outputs email addresses.# eg. python email_extractor.py < PythonFAQ.html# This script can be used for whatever you want, EXCEPT SPAMMING !import sys,reprint 'n'.join(…
import turtle step = 40 for i in range(8): for j in range(8): turtle.penup() turtle.goto(i*step, j*step) turtle.pendown() turtle.begin_fill() if (i+j)%2 == 0: turtle.color("white") else: turtle.color("black") for k in range(4): turtle.…
下面代码,全部都是nodejs端的,不用客户端代码.也就是,选择图片的form表单以及上传完毕预览图片的html,都是由node服务端输出的. 1 启动代码:(node upload.js) var server = require("upload/server"); var router = require("upload/router"); var requestHandlers = require("upload/requestHandlers&qu…
问题描述 今天在学习第四章表单时,创建form实例时访问实例属性时报错,即以下代码出错 form = LoginForm() print(form.username) RuntimeError: Working outside of request context. This typically means that you attempted to use functionality that needed an active HTTP request. Consult the documen…