12. Transpose: Return the transpose of the DataFrame, that is, exchange the rows and columns
13.axes: returns a list of row labels and column labels
14.dtypes: returns the data type of each column of the Series
15.empty: returns a Boolean value to determine whether the output data object is empty, if it is True, the object is empty
16.columns: Return all column labels of DataFrame
17. Modify the label name rename():
DataFrame.rename（index=None,columns=None,inplace=False）
index: row label after modification
columns: modified column labels
inplace: The default is False, the source data is not changed, and the modified data is returned. True to change data
18.info function: Used to print a brief summary of the DataFrame, displaying information about the DataFrame. Including the data type dtype of the index and the data type dtype of the column, the number of non-null values and memory usage
