Is there a faster way to zero out a pandas dataframe column than iterating through the dataframe like this (where A, B and C are the Column names):

```
while x < Framelength
   dg.iloc[x, A] = 0
   dg.iloc[x, B] = 0
   dg.iloc[x, C] = 0
   x+=1

```

I'm okay with zeroing out the entire dataframe if that would be faster