[Python] Matplotlib could not convert string to float when iterating through tick labels

I was trying to run code to modify the y ticks of a matplotlib plot:

fig, ax = plt.subplots()
ax.plot([1,2,3], [-50, 50, 100])
# Divide y tick labels by 10
ax.set_yticklabels([int(float(label.get_text())/10) for label in ax.get_yticklabels()])


But I got the error: ValueError: could not convert string to float: '−60'

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