import os
import stat

st = os.stat('/etc/fstab')

# __getitem__
x = st[stat.ST_MTIME]
print((x, type(x)))

# __getattr__
x = st.st_mtime
print((x, type(x)))
(1441565864, <class 'int'>)
(1441565864.3485234, <class 'float'>)