import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
%matplotlib inline
plt.rcParams["font.sans-serif"] = "Simhei"
#填充符号
marks = ["o",
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
%matplotlib inline
plt.rcParams["font.sans-serif"] = "Simhei"
#填充符号
marks = ["o",