How to clip just one column of dataframe

You can also use inplace=True to avoid the assignment:

dfo['value'].clip(upper=100, inplace=True)

You can specify column:

dfo['value'] = dfo['value'].clip(upper=100)

If possible multiple columns:

cols = ['value', 'another col']
dfo[cols] = dfo[cols].clip(upper=100)

Or if need clip all numeric columns filter them by DataFrame.select_dtypes:

cols = df.select_dtypes(np.number).columns
dfo[cols] = dfo[cols].clip(upper=100)