Python Matplotlib - 如何仅在线图上注释 y 轴值？

Question

我在一个图上绘制了 2 个线图，代表 2019 年和 2020 年船舶到达数据。

对于每个折线图，

y 轴代表船舶到达数量

x 轴代表月份（三月、四月、五月等..）

但是，我不确定如何让 y 轴值（船舶到达数量）显示在两个折线图上。

有人知道怎么做吗？

我的代码和折线图如下：

# Trendline comparison of the total number of vessel arrivals in 2019 & 2020

# Displaying all numbers to 0 decimal places

pd.options.display.float_format = "{:,.0f}".format

VESSEL_ARRIVALS_2019 = MARITIME_DATASET_2019["VESSEL ARRIVAL NUMBERS"]

VESSEL_ARRIVALS_2020 = MARITIME_DATASET_2020["VESSEL ARRIVAL NUMBERS"]

# Displaying the plotted figure

fig = plt.figure(figsize = (48, 20))

plt.xticks(fontsize = 20)

plt.yticks(fontsize = 20)

plt.plot(LIST_OF_MONTHS, VESSEL_ARRIVALS_2019, color = "blue", linewidth = 3,  label = "2019 NUMBER OF VESSEL ARRIVALS")

plt.plot(LIST_OF_MONTHS, VESSEL_ARRIVALS_2020, color = "red", linewidth = 3,  label = "2020 NUMBER OF VESSEL ARRIVALS")

plt.title("TOTAL NUMBER OF VESSEL ARRIVALS 2020 ON 2019 COMPARISON", fontsize = 32)

plt.legend(loc = "best", prop = {"size": 26})

plt.show()

Answer 1

使用该annotate功能。例如，像这样。offset = 100 # adjust so it looks nice, but isn't on your linefor x, y in zip(LIST_OF_MONTHS, VESSEL_ARRIVALS_2019):  plt.annotate(y, (x,y+offset))