index = df.index
number_of_rows = len(index)
df = pd.DataFrame({"Letters": ["a", "b", "c"], "Numbers": [1, 2, 3]})
index = df.index
number_of_rows = len(index)
rows_count = len(df.index)
rows_count = len(df.axes[0])
rows_count = df.shape[0]
rows_count = df.count()[0]
>>> df.count(axis='columns')
0 3
1 2
2 3
3 3
4 3
dtype: int64
>>> df[df['LastName'] == 'Smith'].index
Int64Index([1], dtype='int64')
number_of_rows = len(df)
len(df)
#print
print('row = ' + str(len(df)))
len(df)