turtle海龟库是一个很流行的绘制图像的函数库，想象一个小乌龟，在一个横轴为x、纵轴为y的坐标系原点，(0,0)位置开始，它根据一组函数指令的控制，在这个平面坐标系中移动，从而在它爬行的路径上绘制了图形。
七巧板中，各个边长可以用勾股定理求到
勾股定理公式 a²+b²=c²
from math import sqrt
from turtle import color
from turtle import begin_fill
from turtle import left
from turtle import forward
from turtle import end_fill
from turtle import right
from turtle import exitonclick
from turtle import hideturtle
a=300
color("red") # ①
begin_fill()
left(45)
forward(a)
left(135)
forward(sqrt(2*a*a))
left(135)
forward(a)
end_fill()
color("blue") # 2
begin_fill()
right(90)
forward(a)
right(135)
forward(sqrt(2*a*a))
right(135)
forward(a)
end_fill()
color("orange")
color("orange") #3
begin_fill()
left(90)
forward(a)
right(135)
forward((sqrt(2*a*a))/2)
right(135)
forward(a/2)
end_fill()
color("#9400D3")#4
begin_fill()
for i in range(4):
left(90)
forward(a/2)
end_fill()
left(90)
forward(a/2)
end_fill()
color("#CD00CD") # 5
begin_fill()
forward(a/2)
left(135)
forward((sqrt(2*a*a))/2)
left(135)
forward(a/2)
end_fill()
left(90)
forward(a/2)
end_fill()
color("yellow") # 6
begin_fill()
forward(a/2)
left(135)
forward((sqrt(2*a*a))/2)
left(45)
forward(a/2)
end_fill()
color("green") #7
begin_fill()
forward(a/2)
right(135)
forward((sqrt(2*a*a))/2)
right(90)
forward((sqrt(2*a*a))/2)
end_fill()
hideturtle()
exitonclick()
