if "normalize" in matplotlib.pyplot.pie.__code__.co_varnames:
# Matplotlib >= 3.3.0
ax.pie(counts, autopct=lambda p: '{:.0f}'.format(p * sum(counts)/100) if p != 0 else '',
- normalize=True)
+ normalize=sum(counts) != 0)
else:
# Matplotlib < 3.3.0
ax.pie(counts, autopct=lambda p: '{:.0f}'.format(p * sum(counts)/100) if p != 0 else '')