Pandas: how to change all the values of a column?

Question

I have a data frame with a column called \"Date\" and want all the values from this column to have the same value (the year only). Example:

City         


        

Answer 1

Or if one want to use lambda function in the apply function:

data['Revenue']=data['Revenue'].apply(lambda x:float(x.replace("$","").replace(",", "").replace(" ", "")))