how to rename columns with same name pandas code example

Example 1: rename multiple pandas columns with list

for j in range(len(df.columns)):
    old = df.columns[j]
    new = new_columns[j]
    df = df.rename(columns = {old:new})

Example 2: select columns to include in new dataframe in python

new = old.filter(['A','B','D'], axis=1)

Example 3: copy only some columns to new dataframe in r

new = pd.DataFrame([old.A, old.B, old.C]).transpose()