how to give value in column based on other columns : I have a df as follows

    V1|	V2|	V3|	V4
    --+---+---+---
    10|	1 |	3 |	2
    2 |	1 |	1 |	0
    0 |	3 |	0 |	2
    2 |	0 |	1 |	1
    0 |	0 |	2 |	3
    2 |	2 |	0 |	4

i want to write a program so that
if V1<>0 then V2,v3,v4 all are 0
similarly, if V1==0 and V2<>0 then V3,V4 are zero and so on.

I am trying the for loop and if statement but not getting anywhere. Can someone help

