条件、循环、函数定义、字符串操作练习

1.用循环画五角星

from turtle import *
color('yellow','yellow')
begin_fill()
while True:
    forward(100)
    right(144)
    if abs(pos())<1:
        break
end_fill()

运行结果

2.用循环画同心圆

import turtle

for i in range(2,10):
    turtle.up()
    turtle.goto(0,-20*i)
    turtle.down()
    turtle.circle(20*i)
    

运行结果

3.用while循环画太阳花

from turtle import *
color('green','white')
begin_fill()
while True:
    forward(200)
    left(170)
    if abs(pos())<1:
        break
end_fill()
done()

运行结果

4.用函数定义画五个五角星

from turtle import *
setup(600,400)
bgcolor('red')
color('yellow')

def h_draw(r):
    begin_fill()
    for i in range(5):
        forward(r)
        right(144)
    end_fill()


def h_goto(x,y,z):
    up()
    goto(x,y)
    setheading(z)
    down()

h_goto(-260,120,0)
h_draw(120)


h_goto(-110,160,40)
h_draw(40)


h_goto(-65,125,10)
h_draw(40)


h_goto(-55,55,40)
h_draw(40)


h_goto(-110,15,20)
h_draw(40)

运行结果

5.用函数定义画钻石花瓣的太阳花

import turtle
turtle.color('red')
turtle.fillcolor('yellow')

turtle.begin_fill()

def h_draw(t):
    t.fd(80)
    t.right(45)
    t.fd(80)
    t.right(135)

for i in range(36):
    h_draw(turtle)
    h_draw(turtle)
    turtle.left(10)

turtle.end_fill()


turtle.right(90)
turtle.pensize(5)
turtle.color('green')
turtle.forward(300)

运行结果

6.字符串操作

a.输入学号，识别年级、专业、序号

a=input('请输入你的学号：')
print('你的年级是{}级'.format(a[2:4]))
print('你的专业序号是{}'.format(a[8:10]))
print('你的班级学号是{}'.format(a[10:]))

b.输入1-7的数字，输出对应的“星期几”

s="星期一星期二星期三星期四星期五星期六星期天"

i=int(input("请输入(1-7)："))

if(0<i<8):

    print(s[-3+3*i:0+3*i])

else:

    print("输入有误!")

运行结果

c.识别身份证号中的省市区、年龄、性别

ID=input('请输入十八位身份证号码: ')

if len(ID)!=18:

  print("错误的身份证号码!!")

   

ID_add=ID[0:6]

ID_birth=ID[6:10]

ID_sex=ID[14:17]

 

if int(ID_add)==440101:

  print("省市区:广东省广州市市辖区")

elif int(ID_add)==440102:

    print("省市区:广东省广州市东山区")

elif int(ID_add)==440103:

    print("省市区:广东省广州市荔湾区")

elif int(ID_add)==440104:

    print("省市区:广东省广州市越秀区")

elif int(ID_add)==440105:

    print("省市区:广东省广州市海珠区")

 

     

birth=2017-int(ID_birth[0:4])

print("年龄：{}".format(birth)) 

   

if int(ID_sex)%2==0:

  print('性别：女')

else:

  print('性别：男')

d.用字符串操作生成python文档各库的网址(起始网址在这里https://docs.python.org/3.6/library/index.html)

a="https://docs.python.org/3.6/library/index"
b=".html"
address=a+b
print(address)

运行结果

e.练习字符串的+,*,in,len(),eval()