[Solved] matplotlib don’t show the correct vector

Kobbo Asks: matplotlib don’t show the correct vector
I’m new to python and learn to plot graph with matplotlib. I try to plot vector that point from (0, 0) to (2, 1).

Code:
import matplotlib.pyplot as plt

O = [0, 0]
V = [2, 1]

plt.quiver(O[0], O[1], V[0], V[1], units='xy', scale=1, color='r')

plt.xlim(-3, 3)
plt.ylim(-3, 3)

plt.grid()
plt.show()

I don’t know why but

{
“lightbox_close”: “Close”,
“lightbox_next”: “Next”,
“lightbox_previous”: “Previous”,
“lightbox_error”: “The requested content cannot be loaded. Please try again later.”,
“lightbox_start_slideshow”: “Start slideshow”,
“lightbox_stop_slideshow”: “Stop slideshow”,
“lightbox_full_screen”: “Full screen”,
“lightbox_thumbnails”: “Thumbnails”,
“lightbox_download”: “Download”,
“lightbox_share”: “Share”,
“lightbox_zoom”: “Zoom”,
“lightbox_new_window”: “New window”,
“lightbox_toggle_sidebar”: “Toggle sidebar”
}

my vector plot

thank you very much.

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