[Python] Parameter not found although present in function call (don't understand the syntax)...

This code doesnt compile it gives an error message. TypeError: update() missing 1 required positional argument: 'posY'

Why is it missing "posY" although i have given this parameter to the function? I gave it "posX", too and it does not complain about not finding it.

fig, ax = plt.subplots()
posX = 0
posY = 0
scat = ax.scatter(pos, 0, c="b", s=5, label=f'der sich bewegende punkt')
ax.set(xlim=[-5, 5], ylim=[-1, 1], xlabel='Ort', ylabel='garnix is 1D')
ax.legend()


def update(frame, posX, posY):
# for each frame, update the data stored on each artist.
x = posX + random.gauss()
y = posY + random.gauss()
posX = posX + random.gauss()
posY = posY + random.gauss()
# update the scatter plot:
scat.set_offsets([x,y])
return (x,y)

ani = animation.FuncAnimation(fig=fig, func=update(posX, posY), frames=240, interval=50)
ani.save('test.mp4')


I expected it to run well. Just as the code below

fig, ax = plt.subplots()
pos = 0
scat = ax.scatter(pos, 0, c="b", s=5, label=f'der sich bewegende punkt')
ax.set(xlim=[-5, 5], ylim=[-1, 1], xlabel='Ort', ylabel='garnix is 1D')
ax.legend()


def update(frame):
# for each frame, update the data stored on each artist.
x = pos + random.gauss()`
# update the scatter plot:
scat.set_offsets([x,0])
return (x)


ani = animation.FuncAnimation(fig=fig, func=update, frames=40, interval=30)
ani.save('test.mp4')

Continue reading...