[Python] shiny express python script is having trouble controlling the barchart plot

Im having trouble setting the y axis to start at zero for the following shiny express python script. Instead it starts at 4.1 . the set_ylim is having no affect.

from shiny.express import input, render, ui
import matplotlib.pyplot as plt
import numpy as np



data = {
"Maturity": ['1Y', '2Y', '3Y', '4Y', '5Y', '6Y', '7Y', '8Y'],
"Yield": [4.1, 4.3, 4.5, 4.7, 4.8, 4.9, 5.0, 5.1]
}
data=np.array([data["Maturity"], data["Yield"]])
#df = pd.DataFrame(data)
print(data[1])
def create_line_plot():
x = data[0]
y = data[1]
fig, ax = plt.subplots()
#fig.title("Yield Curve")
ax.bar(x, y)
ax.set_xlabel("Maturity")
ax.yaxis.set_label_text("Yield (%)")
ax.set_ylim(bottom=0) # Ensures the y-axis starts at 0 # Ensures the y-axis starts at 0
return fig

@render.plot
def my_plot():
return create_line_plot()

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