Pandas format column as currency

    def format(x):
        return "${:.1f}K".format(x/1000)


    df = pd.DataFrame(
        {'A':['A','B','C','D'],
         'C':[12355.00,12555.67,640.00,7000]
        })

    df['C'] = df['C'].apply(format)

    print(df)

Or you could use a lambda function for shorter syntax

df['C'] = df['C'].apply(lambda x: "${:.1f}k".format((x/1000)))