Python-无效的语法错误

Question

I am learning python , and I am running below code :

df1 = pd.DataFrame( [['A',20,30],['B',30,40]],index=['A1','B1'],columns = ['a','b','c'])

df1.loc['A1':'B1',['a':'b']] #edit to df1 to make easier for answerers

It is giving syntax error : invalid syntax (at ':' after 'a')

Whats wrong with this?

Answer 1

You want to give it a slice object, as per the documentation here . So df1.loc['A1':'B1','a':'b'] works. Note that you want df1. not df. .

Allowed inputs are:

• A single label, eg 5 or 'a', (note that 5 is interpreted as a label of the >index, and never as an integer position along the index).
• A list or array of labels, eg ['a', 'b', 'c']
• A slice object with labels, eg 'a':'f'.