filenames = glob.glob(path + "/*.csv")

df  = []
for filename in filenames:
     df.append(pd.read_csv(filename))

frame = pd.concat(df)

header = frame.iloc[0]
frame2 = df[1:]
frame2.rename(columns = header)

'list' object has no attribute 'rename'

type(frame)

pandas.core.frame.DataFrame