How to parametrize a column index in pandas?

Sometimes I want to use all columns and sometimes I want to exclude the last column.

df.iloc[:, :].apply(foobar)  # all columns
df.iloc[:, :-1].apply(foobar)  # exclude last column

Can I parameterize that somehow?

if exclude_last:
   idx = ':-1'
else:
   idx = ':'

df.iloc[:, idx].apply(foobar)

>Solution :

You can use df.columns for this purpose:

if exclude_last:
   cols = df.columns[:-1]
else:
   cols = df.columns

df.loc[:, cols].apply(foobar)