Python基础

Pycharm开发环境设置与熟悉。

练习基本输入输出：

print('你好,{}.'.format(name))

uprint(sys.argv)

库的使用方法：

import ...

from ... import ...

条件语句：

    if (abs(pos()))<1:

        break

循环语句：

for i in range(5):

while True:

函数定义：

def mygoto(x,y):

def drawjx(r):

综合练习：画一面五星红旗，将代码与运行截图发布博客交作业。

import time
import turtle
import os


def draw_rectangle(start_x, start_y, rec_x, rec_y):
    turtle.goto(start_x, start_y)
    turtle.color('red')
    turtle.fillcolor('red')
    turtle.begin_fill()
    for i in range(2):
        turtle.forward(rec_x)
        turtle.left(90)
        turtle.forward(rec_y)
        turtle.left(90)
    turtle.end_fill()


def draw_star(center_x, center_y, radius):
    turtle.setpos(center_x, center_y)
    # find the peak of the five-pointed star
    pt1 = turtle.pos()
    turtle.circle(-radius, 72)
    pt2 = turtle.pos()
    turtle.circle(-radius, 72)
    pt3 = turtle.pos()
    turtle.circle(-radius, 72)
    pt4 = turtle.pos()
    turtle.circle(-radius, 72)
    pt5 = turtle.pos()
    # draw the five-pointed star
    turtle.color('yellow', 'yellow')
    turtle.fill(True)
    turtle.goto(pt3)
    turtle.goto(pt1)
    turtle.goto(pt4)
    turtle.goto(pt2)
    turtle.goto(pt5)
    turtle.fill(False)


# start the project
turtle.speed(5)
turtle.penup()
# draw the rectangle
star_x = -320
star_y = -260
len_x = 660
len_y = 440
draw_rectangle(star_x, star_y, len_x, len_y)
# draw the big star
pice = 660 / 30
big_center_x = star_x + 5 * pice
big_center_y = star_y + len_y - pice * 5
turtle.goto(big_center_x, big_center_y)
turtle.left(90)
turtle.forward(pice * 3)
turtle.right(90)
draw_star(turtle.xcor(), turtle.ycor(), pice * 3)
# draw the small star
turtle.goto(star_x + 10 * pice, star_y + len_y - pice * 2)
turtle.left(turtle.towards(big_center_x, big_center_y) - turtle.heading())
turtle.forward(pice)
turtle.right(90)
draw_star(turtle.xcor(), turtle.ycor(), pice)
# draw the second star
turtle.goto(star_x + pice * 12, star_y + len_y - pice * 4)
turtle.left(turtle.towards(big_center_x, big_center_y) - turtle.heading())
turtle.forward(pice)
turtle.right(90)
draw_star(turtle.xcor(), turtle.ycor(), pice)
# draw the third
turtle.goto(star_x + pice * 12, star_y + len_y - 7 * pice)
turtle.left(turtle.towards(big_center_x, big_center_y) - turtle.heading())
turtle.forward(pice)
turtle.right(90)
draw_star(turtle.xcor(), turtle.ycor(), pice)
# draw the final
turtle.goto(star_x + pice * 10, star_y + len_y - 9 * pice)
turtle.left(turtle.towards(big_center_x, big_center_y) - turtle.heading())
turtle.forward(pice)
turtle.right(90)
draw_star(turtle.xcor(), turtle.ycor(), pice)

turtle.ht()
time.sleep(3)
os._exit(1)