柱状图上的数字显示歪了怎么回事

Question

Answer 1

坐标不对：
for a, b,c in zip(ind, y_boys, y_girls):
plt.text(a, b, '%s' % b,ha='center',va='bottom' )
plt.text(a + bar_width, c, '%s' % c,ha='center',va='bottom' )