Python Import Error + DLL load failed + sys.path

2
votes

in Python 2.7.10 Anaconda 2.3.0 (64-bit), if I write

sys.path.append('C:\\Anaconda\\sms-tools-master\\software\\models\\utilFunctions_C\\')
print sys.path

I get

C:\Anaconda\sms-tools-master\workspace\A1>python A1Part1.py ['C:\Anaconda\sms-tools-master\workspace\A1', 'C:\Anaconda\python27.zip', 'C:\Anaconda\DLLs', 'C:\Anaconda\lib', 'C:\Anaconda\lib\plat-win', 'C:\A naconda\lib\lib-tk', 'C:\Anaconda', 'C:\Anaconda\lib\site-packages', 'C:\ Anaconda\lib\site-packages\Sphinx-1.3.1-py2.7.egg', 'C:\Anaconda\lib\site- packages\cryptography-0.9.1-py2.7-win-amd64.egg', 'C:\Anaconda\lib\site-pack ages\win32', 'C:\Anaconda\lib\site-packages\win32\lib', 'C:\Anaconda\lib \site-packages\Pythonwin', 'C:\Anaconda\lib\site-packages\setuptools-17.1. 1-py2.7.egg', 'C:\Anaconda\sms-tools-master\software\models\utilFunctions_C \']

  1. Is this absolute way of adding to sys.path correct? Is there a relative way?

  2. In the next line of python code I wrote

    from utilFunctions_C import wavread

I instantly get

ImportError: cannot import name wavread

if I run the code in cmd but if I run the code inside IDLE I get:

['C:\Anaconda\sms-tools-master\workspace\A1', 'C:\Python27\Lib\idlelib', 'C:\Windows\system32\python27.zip', 'C:\Python27\DLLs', 'C:\Python27\lib', 'C:\Python27\lib\plat-win', 'C:\Python27\lib\lib-tk', 'C:\Python27', 'C:\Python27\lib\site-packages', 'C:\Anaconda\sms-tools-master\software\models\utilFunctions_C\']

Traceback (most recent call last): File "C:\Anaconda\sms-tools-master\workspace\A1\A1Part1.py", line 8, in from utilFunctions_C import wavread ImportError: DLL load failed: %1 is not a valid Win32 application.

So why there is a difference and how to tackle this issue? Thnx!

1
python

1 Answers

0
votes

I commented 

from utilFunctions_C import wavread

and used

from scipy.io.wavfile import read

Now my code is okay. I found that

utiLFunctions.wavread() is a wrapper that uses scipy.io.wavfile.read() and scales the data to floating point between -1 and 1. If you open up utilFunctions.py you will see that.

You can use scipy.io.wavfile.read as well, as long you scale the data correctly looking at the datatype in the wav file. Due to scaling, for wav files that store samples as int16, you will see that scipy.io.wavfile.read returns values will be 32767 times the values returned by utilFunctions.wavread

Lectures used the function to explain the process more explicitly. Once you have got it, you can use the wrapper utilFunctions.wavread for the rest of the course and in practical applications.

Scroll in https://class.coursera.org/audio-002/forum/search?q=Cannot+import+name+wavread#15-state-query=wavread&15-state-page_num=1

for more details.