python [熊猫] .iloc和.loc

Posted 2021-05-09

df = pd.DataFrame({
  "a": [1, 2 ,3],
  "b": [4, 5, 6],
  "c": [7, 8, 9],
})

df.set_index("b", inplace = True, drop = True)

print df.iloc[1]  # [2, 5, 8]
print df.loc[1]  # KeyError
print df.loc[4]  # [1, 4, 7]