我收到以下代码的错误 . 有人可以告诉我哪里出错了吗？附：我已正确地为.mrcfile指定了路径
import numpy
import Mrc
a = Mrc.bindFile('somefile.mrc')
# a is a NumPy array with the image data memory mapped from
# somefile.mrc. You can use it directly with any function
# that will take a NumPy array.
hist = numpy.histogram(a, bins=200)
# a.Mrc is an instances of the Mrc class. One thing
# you can do with that class is print out key information from the header.
a.Mrc.info()
# Use a.Mrc.hdr to access the MRC header fields.
wavelength0_nm = a.Mrc.hdr.wave[0]
AttributeError Traceback（最近一次调用最后一次）in（）3 a = Mrc.bindFile（'/ home / smitha / deep-image-prior / data / Falcon_2015_05_14-20_42_18.mrc'）4 hist = numpy.histogram（a，bins = 200）----> 5 a.Mrc.info（）6 wavelength0_nm = a.Mrc.hdr.wave [0] 7 AttributeError：'NoneType'对象没有属性'Mrc'