Python经典编程习题100例：第57例：画图，学用line画直线

题目描述：

画图，学用line画直线。

解题思路：

> 无需解释

代码：

canvas = Canvas(width=300, height=300, bg='green') 
canvas.pack(expand=YES, fill=BOTH) 
x0 = 263
y0 = 263
y1 = 275
x1 = 275
for i in range(19):
canvas.create_line(x0,y0,x0,y1, width=1, fill='red')
x0 = x0 - 5
y0 = y0 - 5
x1 = x1 + 5
y1 = y1 + 5
x0 = 263
y1 = 275
y0 = 263
for i in range(21):
canvas.create_line(x0,y0,x0,y1,fill = 'red')
x0 += 5
y0 += 5
y1 += 5
mainloop()