# fractal.py
import taichi as ti
ti.init(arch=ti.gpu)
n = 320
pixels = ti.var(dt=ti.f32, shape=(n * 2, n))
@ti.func
def complex_sqr(z):
return ti.Vector([z[0] ** 2 - z[1] ** 2, z[1] * z[0] * 2])
@ti.kernel
def paint(t: ti.f32):
for i, j in pixels: # 对于所有像素，并行执行
c = ti.Vector([-0.8, ti.sin(t) * 0.2])
z = ti.Vector([float(i) / n - 1, float(j) / n - 0.5]) * 2
iterations = 0
while z.norm() < 20 and iterations < 50:
z = complex_sqr(z) + c
iterations += 1
pixels[i, j] = 1 - iterations * 0.02
gui = ti.GUI("Fractal", (n * 2, n))
for i in range(1000000):
paint(i * 0.03)
gui.set_image(pixels)
gui.show()
从官方网复制的代码，在上述环境中运行时，冒号处显示语法错误，如下：
函数参数在python3.7.3中有什么特别的吗？
