Python input and output exercises, arithmetic exercises, turtle preliminary exercises

1. Hello world!
Print("Hello world! ")

2. Simple Interactive (interactive, file-style) textbook P19
>>> name = input ("pleaseinput your name:")>>> please input Your name:poonprint(name)>>> Poon

3, the user input two numbers, calculate and output two numbers of the sum:
S1 = float (Input ("Please input the first num:")) S2= Float (Input ("Please input the second num:")) Sum= S1 +S2Print("The result is:%s"%sum)Print("The result is%.2f"% ((Float (input ("The first num is")) + (float (input ("The secibd num is")))))

 4, the user input triangle three-side length, and calculate the area of the triangle: (Helen Formula) 
 A = float (input ( " please input the A side:   " )) b  = float (input ( " please input the B side:   "  = float (input ( " please input the C side:   " )) p  = (A + B + c)/2s  = (p * (p-a) * (p-b) * (P-C)) * * 0.5print  ( " the Square is:%.2f   "% s) 

5. Enter the radius to calculate the area of the circle.
Fromimport= float (input ("pleaseinput the R:"= pi * (r**2 )print("Thearea is%.2f" % s)

6, draw a group of same cut round
Import  turtle as Tt.speed (1) t.circle (ten) t.circle (t.circle)(30 )

 7, draw a pentagram 
 import   turtle as Tt.speed (  1)  for  I in  range (5) 
 T.right ( 144) 

8. Draw a All-yellow pentagram
Import  turtle as Tt.fillcolor ("red") T.begin_fill ()while  True:    t.forward (    t.right) (144)    if abs (POS ()) <1 :          Break T.end_fill ()

Python input and output exercises, arithmetic exercises, turtle preliminary exercises