为什么matplotlib没有属性“ pylab”？

import matplotlib as mpl

x = np.arange(0,10,0.01)   # import numpy as np
y = np.sin(x)
mpl.pylab.plot(x,y)
mpl.pylab.show()

import matplotlib.pylab as pl

pylab

import matplotlib as mpl
import matplotlib.pylab  # Loads the pylab submodule as well
# mpl.pylab is now defined

import matplotlib.pylab as pl

pylab

matplotlib

from matplotlib import pyplot
import numpy

pyplot.plot(range(1,100), numpy.sin(range(1,100)))
pyplot.show()

pylab

>>> from pylab import *
>>> plot(range(1,100), sin(range(1,100)))
>>> show()

__init__.py