Matplotlib动画不接受圆补丁作为Fargs

import math
import matplotlib
import matplotlib.pyplot as plt
import matplotlib.patches as patches
from matplotlib.patches import Circle
from matplotlib import animation
from utils import rgb2hex
from tg import small_tg

matplotlib.rcParams["figure.figsize"]=(10, 5)
matplotlib.rcParams['toolbar'] = 'None'

fig, ax = plt.subplots()
ax.axis("equal")
ax.set_xlim(-10, 10)
ax.set_ylim(-5, 5)
ax.axis("off")

state_nodes = []
for state in small_tg["states"]:
    center = small_tg["states"][state]["graphic_properties"]["position"]
    state_nodes.append(Circle(center, 0.2, color = rgb2hex(255, 255, 255)))

def animate(i, state):
    print("&", i ,state)
    y = math.ceil((abs(i-100))*2.55)
    print(i, y, (abs(i-100))*2.55)
    state.set_color = rgb2hex(y,y,y)
    ax.add_artist(state)
    return state,

for state in state_nodes:
    print(state)
    animation.FuncAnimation(fig, animate, fargs = (state,), frames=201, interval=1, blit=True, repeat = False)

plt.show()

for循环中的print语句显示状态,但是animate函数中的print语句不显示任何内容,这意味着没有调用该函数。我找不到任何逻辑错误。请帮忙。