简简单单用符号 画一个正三角形 用符号

num = 4
sun1 = 1
kong = [" "]
hao = ["@"]
a = []  # 小列表
while num >= 0:
    a = kong * num + hao * sun1 + kong * num
    num -= 1
    sun1 += 2
    print(a)