There are multiple ways to select all rows of some columns of a dataframe. you can use loc (for label based indexing) or iloc (for positional indexing).
Approach 1: Using column names
>>> df
a b c d e
0 AA 29 1967 23 nn
1 BB 12 1867 12 mm
2 CC 45 1834 123 mm
3 DD 34 1945 4 we
4 EE 38 2011 4 qw
5 FF 17 1745 34 rt
6 GG 22 1867 23 ty
7 HH 12 1756 12 yu
8 II 38 2000 56 re
>>> df1=df[['a','c', 'e']]
>>> df1
a c e
0 AA 1967 nn
1 BB 1867 mm
2 CC 1834 mm
3 DD 1945 we
4 EE 2011 qw
5 FF 1745 rt
6 GG 1867 ty
7 HH 1756 yu
8 II 2000 re
Approach 2: using iloc and column numbers.
>>> df2=df.iloc[:,[0,2,4]]
>>> df2
a c e
0 AA 1967 nn
1 BB 1867 mm
2 CC 1834 mm
3 DD 1945 we
4 EE 2011 qw
5 FF 1745 rt
6 GG 1867 ty
7 HH 1756 yu
8 II 2000 re
Approach 3: Using loc and column names.
>>> df3=df.loc[:,['a','c', 'e']]
>>> df3
a c e
0 AA 1967 nn
1 BB 1867 mm
2 CC 1834 mm
3 DD 1945 we
4 EE 2011 qw
5 FF 1745 rt
6 GG 1867 ty
7 HH 1756 yu
8 II 2000 re
>>>