df size

count_row = df.shape[0]  # gives number of row count
count_col = df.shape[1]  # gives number of col count

>>> s = pd.Series({'a': 1, 'b': 2, 'c': 3})
>>> s.size
3

df = pd.DataFrame({'col1': [1, 2], 'col2': [3, 4]})
>>> df.size
4