DataFrame

import pandas as pd

mydict = [{'a': 1, 'b': 2, 'c': 3, 'd': 4},
          {'a': 100, 'b': 200, 'c': 300, 'd': 400},
          {'a': 1000, 'b': 2000, 'c': 3000, 'd': 4000 }]
df = pd.DataFrame(mydict)
print(df)
#       a     b     c     d
# 0     1     2     3     4
# 1   100   200   300   400
# 2  1000  2000  3000  4000
print(df.iloc[:,:-3])
#       a
# 0     1
# 1   100
# 2  1000