1. import pandas as pd
   a = [3,7,2]
   myvar = pd.Series(a,index=["x","y","z"])
   print(myvar["x"]) #结果是3  #给序列赋值index ，然后可以根据index找到对应的数 

2. data = {"col1": range(-5,0), "col2": range(5)}
   cdf = pd.DataFrame(data)
   print(cdf)  
     

   print(cdf.loc[2])  #取第三行的值
    

    

3.  clear data 

   

  corr() method is a table with a lot of numbers that represents how well the relationship is between two columns.

import matplotlib.pyplot as plt                              

 df.plot() #图标
plt.show()

pandas 更多用法参考一下：

 Pandas - DataFrame Reference