Python attribute error

Question

I am new to python and getting this error, please help me out correct it.

AttributeError: 'module' object has no attribute 'fft2'

Program

import numpy, scipy , pylab , wave , scipy.io.wavfile as wav 
xs = numpy.arange (1,100,.01)
rate , sample = wav.read("pianotest.wav")
fft2=scipy.fft2(sample) # algo applied
bp=fft2[:]  
for i in range(len(bp)): 
if i>=10:bp[i]=0  
ibp=scipy.ifft2(bp) # inverse algo
print"to check dimension"
print("sampling rate = {} Hz, length = {} samples, channels = {}".format(rate,   *sample.shape))
print(sample)

A.J. Uppal · Accepted Answer · 2014-06-04 04:32:21Z

4

Instead of scipy.fft2 and scipy.ifft2, do scipy.fftpack.fft2, or numpy.fft.fft2.

Also, add import scipy.fftpack2 to the top of your code, and then everything should work fine.

Look here for more information on scipy.fftpack.fft2 or here for information on numpy.fft.fft2.

Here is your edited code:

import numpy, scipy , pylab , wave, scipy.fftpack, scipy.io.wavfile as wav 
xs = numpy.arange (1,100,.01)
rate , sample = wav.read("pianotest.wav")
fft2=scipy.fftpack.fft2(sample) # algo applied
bp=fft2[:]  
for i in range(len(bp)): 
if i>=10:bp[i]=0  
ibp=scipy.fftpack.ifft2(bp) # inverse algo
print"to check dimension"
print("sampling rate = {} Hz, length = {} samples, channels = {}".format(rate,   *sample.shape))
print(sample)

If it still isn't working, check to see if your scipy version is 0.14.0 by typing python -c "import scipy; print scipy.__version__" into your command prompt. If it doesn't show 0.14.0 or above, then upgrade your version of scipy.

edited Jun 4, 2014 at 4:32

answered Jun 4, 2014 at 4:21

A.J. Uppal

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4 Comments

user3699203 Over a year ago

still shows the same error as "AttributeError: 'module' object has no attribute 'fftpack'"

user3699203 Over a year ago

Thank you, just need to add another line "from scipy.fftpack import fft2, ifft2 " at the top and it works fine

A.J. Uppal Over a year ago

@user3699203 if this answer helped you, feel free to accept it by clicking the green check mark next to my answer. Full disclosure: it gives you +2 reputation :)

Christian Tapia Over a year ago

@aj8uppal next time, link to this post: How does accepting an answer work

Christian Tapia · Accepted Answer · 2014-06-04 04:22:15Z

1

It looks like you want either this from SciPy

scipy.fftpack.fft2

or the following from NumPy

numpy.fft.fft2

answered Jun 4, 2014 at 4:22

Christian Tapia

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3 Comments

user3699203 Over a year ago

AttributeError: 'module' object has no attribute 'fftpack'

Christian Tapia Over a year ago

Are you sure you installed the SciPy module correctly?

user3699203 Over a year ago

Thanks, just need to add another line "from scipy.fftpack import fft2, ifft2 " at the top and it works fine

timgeb · Accepted Answer · 2014-06-04 04:24:16Z

1

According to the docs here and here it should be either numpy.fft.fft2 or scipy.fftpack.fft2, not scipy.fft2.

answered Jun 4, 2014 at 4:24

timgeb

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