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+In [8]:
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+import matplotlib.pyplot as plt
+
+# 数据
+data = {(-3.00, 4), (-2.50, 12), (-1.75, 50), (-1.15, 120), (-0.50, 205), (0.15, 255), (0.75, 170), (1.25, 100), (1.85, 20), (2.45, 14)}
+
+# 拆分数据
+x1, y1 = zip(*sorted([(x, y) for x, y in data if x < 0]))
+x2, y2 = zip(*sorted([(x, y) for x, y in data if x > 0]))
+
+# 绘图
+plt.bar(x1, y1, width=0.3, color='b', align='center')
+plt.bar(x2, y2, width=0.3, color='g', align='center')
+
+plt.xlabel('x')
+plt.ylabel('y')
+
+plt.show()
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