reset index python

1>>> df.reset_index(drop=True)
2    class  max_speed
30    bird      389.0
41    bird       24.0
52  mammal       80.5
63  mammal        NaN
7

1df.reset_index(drop=True)
2

1In [194]: df.reset_index(drop=True)
2Out[194]: 
3  _worker_id  foo
40          A    1
51          B    2
62          C    3

1>>> df.reset_index()
2    index   class  max_speed
30  falcon    bird      389.0
41  parrot    bird       24.0
52    lion  mammal       80.5
63  monkey  mammal        NaN
7