xigua40=pdread_csvexamplecsvindex_col=1encoding=gbkx = xigua40密度含糖量values 解释一下这个代码

pd.read_csv('example.csv',index_col=1,encoding='gbk'): This line of code reads a CSV file named 'example.csv' using the pandas library. The 'index_col=1' parameter specifies that the second column of the CSV file should be used as the index of the resulting DataFrame. The 'encoding='gbk'' parameter specifies that the file is encoded in the GBK format.

xigua40[['密度','含糖量']]: This line of code selects two columns from the DataFrame 'xigua40', namely '密度' and '含糖量', using double square brackets to create a new DataFrame.

.values: This line of code extracts the values from the selected DataFrame and returns them as a NumPy array. The resulting array contains two columns, one for '密度' and one for '含糖量'