如何用Python制作两个y轴(x, y1和y2)的散点图

Question

我想做一个散点图，在这个散点图上我可以有两个y轴(右边的y轴=产量(Kg/ha);y轴=面积(公顷)(左图)，x轴表示年份。并显示"趋势线"。提前谢谢。

crops1 = pd.DataFrame({"x1": crops['Years'],
"y1_1": crops['Area_ha'], 
"y1_2": crops['Yield_kg']})
crops2 = pd.DataFrame({"x2": crops['Years'],
"y2_1": crops['Area_ha'], 
"y2_2": crops['Yield_kg']})
#plt.scatter(x,y)
fig, ax1 = plt.scatter(x1,y1)
ax2=ax1.twinx()

crops1.scatter(x="x1", y= ["y1_1"], ax=ax1, legend=False)
crops1.scatter(x="x1", y="y1_2", ax=ax2, legend=False, color="r")
crops2.scatter(x="x2", y="y2_1", ax=ax1, legend=False)
crops2.scatter(x="x2", y="y2_2", ax=ax2, legend=False, color="r")

Answer 1

import matplotlib.pyplot as plt
fig, ax1 = plt.subplots()
ax2 = ax1.twinx()
ax1.scatter(x, y1, color='g')
ax2.scatter(x, y2, color='b')
ax1.set_xlabel('X data')
ax1.set_ylabel('Y1 data', color='g')
ax2.set_ylabel('Y2 data', color='b')
plt.show()

Answer 2

import matplotlib.pyplot as plt
import pandas as pd
import numpy as np
df = pd.DataFrame({
"X": [1, 2 ,3, 4],
"Y": [2, 4, 9, 7],
"description": ["a", "b", "c", "d"]})
df.plot.scatter(x="X", y="Y")
z = np.polyfit(df["X"], df["Y"], deg=1)
p = np.poly1d(z)
plt.plot(df["X"], p(df["X"]), "r--")
plt.show()

熊猫散点图:https://pandas.pydata.org/pandas-docs/version/1.3/reference/api/pandas.DataFrame.plot.scatter.html

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