Python

index = df.index
number_of_rows = len(index)

>>> df.count(axis='columns')
0    3
1    2
2    3
3    3
4    3
dtype: int64

number_of_rows = len(df)

In [37]:
df = pd.DataFrame({'a':list('abssbab')})
df.groupby('a').count()

Out[37]:

   a
a   
a  2
b  3
s  2

[3 rows x 1 columns]

len(df)

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