条件循环函数定义字符串操作练习

Posted 2020-10-07 yyxpython

注意标准库的两种导入与使用方式，建议大家采用<库名>.<函数名>的方式。

对前面的代码进行优化，用for,while,if,def实现：

用循环画五角星

1 import turtle
2 
3 turtle.fillcolor("red")
4 turtle.begin_fill()
5 for i in range(5):
6         turtle.forward(100)
7         turtle.right(144)
8 turtle.end_fill()

用循环画同心圆

1 import turtle
2 for i in range(3):
3     turtle.up()
4     turtle.goto(0,-50*(i+1))
5     turtle.down()
6     turtle.circle(50*(i+1))

用while循环画太阳花

1 import turtle
2 turtle.color(\'red\',\'yellow\')
3 turtle.begin_fill()
4 while True:
5     turtle.forward(200)
6     turtle.left(170)
7     if abs(turtle.pos()) < 1:
8         break
9 turtle.end_fill()

用函数定义画五个五角星

 1 import turtle
 2 turtle.setup(600,400,0,0)
 3 turtle.color("yellow")
 4 turtle.bgcolor(\'red\')
 5 turtle.fillcolor("yellow")
 6  
 7 def Mygoto(x,y):
 8     turtle.up()
 9     turtle.goto(x,y)
10     turtle.down()
11  
12 def Mydraw(r):
13     turtle.begin_fill()
14     for i in range(5):
15         turtle.forward(r)
16         turtle.right(144)
17     turtle.end_fill()
18  
19 Mygoto(-273,110)
20 Mydraw(100)
21  
22 Mygoto(-121,162)
23 turtle.left(45)
24 Mydraw(50)
25  
26 Mygoto(-79,110)
27 Mydraw(50)
28  
29 Mygoto(-79,51)
30 turtle.right(45)
31 Mydraw(50)
32  
33 Mygoto(-121,22)
34 turtle.right(45)
35 Mydraw(50)

用函数定义画钻石花瓣的太阳花

 1 import turtle
 2 def Yyxdraw_diamond(brad):
 3     brad.forward(120)
 4     brad.right(45)
 5     brad.forward(120)
 6     brad.right(135)
 7 def Yyxdraw_art():
 8     window=turtle.Screen()
 9     window.bgcolor("red")
10     brad=turtle.Turtle()
11     brad.shape("turtle")
12     brad.color("yellow")
13     for i in range(36):
14         Yyxdraw_diamond(brad)
15         Yyxdraw_diamond(brad)
16         brad.left(10)
17     window.exitonclick()
18  
19 Yyxdraw_art()

字符串操作

输入学号，识别年级、专业、序号。

 1 majors = {
 2   11:\'网络工程\',
 3   12:\'软件工程\',
 4   13:\'数字媒体\',
 5   }
 6  
 7 def recognition(studentID):
 8      if len(studentID)<12:
 9          print("请输入正确的学号！")
10      elif studentID.isdigit() != True:
11          print("请输入正确的学号！")
12      else:
13          grade = studentID[0:4]
14          major = studentID[6:8]
15          num = studentID[10:12]
16          print("年级：{}级".format(grade))        
17          print("专业为：",majors.get(int(major)))
18          print("序号:{}".format(num))
19         
20 studentID = input("请输入学号：")
21 recognition(studentID)

输入1-7的数字，输出对应的“星期几”。

1 s="星期一星期二星期三星期四星期五星期六星期天"
2 i=int(input("请输入(1-7)："))
3 if(0<i<8):
4     print(s[-3+3*i:0+3*i])
5 else:
6     print("输入有误!")

识别身份证号中的省市区、年龄、性别。

 1 ID=input(\'请输入十八位身份证号码: \')
 2 if len(ID)!=18:
 3   print("错误的身份证号码!!")
 4    
 5 ID_add=ID[0:6]
 6 ID_birth=ID[6:10]
 7 ID_sex=ID[14:17]
 8  
 9 if int(ID_add)==440101:
10   print("省市区:广东省广州市市辖区")
11 elif int(ID_add)==440102:
12     print("省市区:广东省广州市东山区")
13 elif int(ID_add)==440103:
14     print("省市区:广东省广州市荔湾区")
15 elif int(ID_add)==440104:
16     print("省市区:广东省广州市越秀区")
17 elif int(ID_add)==440105:
18     print("省市区:广东省广州市海珠区")
19  
20      
21 birth=2017-int(ID_birth[0:4])
22 print("年龄：{}".format(birth))
23    
24 if int(ID_sex)%2==0:
25   print(\'性别：女\')
26 else:
27   print(\'性别：男\')

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)

1 yyx1 = "https://docs.python.org/3.6/library/"
2 yyx2 = ".html"
3 yyx3 = input("请输入库名：")
4 print("网址为：%s%s%s"%(yyx1,yyx3,yyx2))

练习字符串的+,*,in,len(),eval()

1 print("No!"*3) 
2 s="this is "
3 t="younger!"
4 print(s+t)
5 p="hello world!!!"
6 for i in range(len(s)):
7     print(i,s[i])