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songhp 3 years ago
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commit ff41619e72

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import matplotlib.pyplot as plt
import matplotlib.font_manager as fm
# 进价与零售价
basePrice, salePrice = 49, 75
# 计算买num个时的批发价买的越多单价越低
def compute(num):
return salePrice * (1-0.01*num)
# numbers用来存储顾客购买数量
# earns用来存储商场的盈利情况
# totalConsumption用来存储顾客消费总金额
# saves用来存储顾客节省的总金额
numbers = list(range(1, 31))
earns = []
totalConsumption = []
saves = []
# 根据顾客购买数量计算三组数据
for num in numbers:
earns.append(round(num*(compute(num)-basePrice), 2))
totalConsumption.append(round(num*compute(num), 2))
saves.append(round(num*(salePrice-compute(num)), 2))
# 绘制商家盈利和顾客节省的折线图,系统自动分配线条颜色
plt.plot(numbers, earns, label='商家盈利')
plt.plot(numbers, totalConsumption, label='顾客总消费', ls='-.')
plt.plot(numbers, saves, label='顾客节省', lw=3)
# 设置坐标轴文本
plt.xlabel('顾客购买数量(件)', fontproperties='simhei')
plt.ylabel('金额(元)', fontproperties='simhei')
# 设置图形标题
plt.title('数量-金额关系图', fontproperties='stkaiti')
# 创建字体,设置图例
myfont = fm.FontProperties(fname=r'C:\Windows\Fonts\STKAITI.ttf')
plt.legend(prop=myfont)
# 计算并标记商家盈利最多的批发数量
maxEarn = max(earns)
bestNumber = numbers[earns.index(maxEarn)]
# 散点图在相应位置绘制一个红色五角星详见8.3节
plt.scatter([bestNumber], [maxEarn], marker='*', color='red', s=120)
# 使用文本标注标记该位置
plt.annotate(xy=(bestNumber, maxEarn), # 箭头终点
xytext=(bestNumber-1, maxEarn+200),# 箭头起点
s=str(maxEarn), # 显示的标注文本
arrowprops=dict(arrowstyle="->")) # 箭头样式
# 显示图形
plt.show()
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