Re: [Quantlib-users] Failed to import QuantLib library in python

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 I recall having the same problem in the past.  Try using pip install rather than pip3 install.
Regards,
Javid
    On Thursday, 13 August 2020, 19:15:32 GMT+8, Christofer Bogaso <bog...@gm...> wrote:  

 Thanks.
I have reinstalled Python3 using brew. And then installed again the QuantLib as below -

pip3 install QuantLib-Python 

Requirement already satisfied: QuantLib-Python in /usr/local/lib/python3.8/site-packages (1.18)

Requirement already satisfied: QuantLib in /usr/local/lib/python3.8/site-packages (from QuantLib-Python) (1.19)

After that I tried to import the library within Python3, but failed.

>>> import QuantLib as ql

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

ModuleNotFoundError: No module named 'QuantLib'

Any idea why is it failing?
On Thu, Aug 13, 2020 at 4:36 PM Luigi Ballabio <lui...@gm...> wrote:

I don't think there is.  You'll probably have to remove the build/bdist.macosx-10.15-x86_64/egg/ directory.  To be sure you're not missing anything, you might also run "pip uninstall QuantLib-Python" first, then look for anything related to QuantLib in /usr/local/lib and its Python subdirectories.  Once you clean them (but be careful to only clean stuff with "quantlib" in its name), you can run "pip install" again.
Luigi

On Thu, Aug 13, 2020 at 12:00 PM Christofer Bogaso <bog...@gm...> wrote:

Thanks Luigi. But, how can I clean that? Is there any specific syntax?
On Thu, Aug 13, 2020 at 3:19 PM Luigi Ballabio <lui...@gm...> wrote:

Hello,    from the fact the traceback starts from "build/bdist.macosx-10.15-x86_64/egg/" and the fact it refers to /usr/local/lib/libQuantLib.0.dylib, it looks to me like it's importing a version you tried to compile rather than the one you installed with pip.  If that's the case, I'd try cleaning that one up.
Hope this helps,    Luigi

On Thu, Aug 13, 2020 at 11:35 AM Christofer Bogaso <bog...@gm...> wrote:

Hi,

I wanted to run QuantLib from my Python workplace, however failed to import the library with below error -

>>> import QuantLib

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

  File "build/bdist.macosx-10.15-x86_64/egg/QuantLib/__init__.py", line 24, in <module>

  File "build/bdist.macosx-10.15-x86_64/egg/QuantLib/QuantLib.py", line 13, in <module>

  File "build/bdist.macosx-10.15-x86_64/egg/QuantLib/_QuantLib.py", line 7, in <module>

  File "build/bdist.macosx-10.15-x86_64/egg/QuantLib/_QuantLib.py", line 6, in __bootstrap__

ImportError: dlopen(/Users/aa/Library/Caches/Python-Eggs/QuantLib_Python-1.16.1-py2.7-macosx-10.15-x86_64.egg-tmp/QuantLib/_QuantLib.so, 2): Symbol not found: __ZN8QuantLib10IborCouponC1ERKNS_4DateEdS3_S3_jRKN5boost10shared_ptrINS_9IborIndexEEEddS3_S3_RKNS_10DayCounterEb

  Referenced from: /Users/aa/Library/Caches/Python-Eggs/QuantLib_Python-1.16.1-py2.7-macosx-10.15-x86_64.egg-tmp/QuantLib/_QuantLib.so

  Expected in: /usr/local/lib/libQuantLib.0.dylib

 in /Users/aa/Library/Caches/Python-Eggs/QuantLib_Python-1.16.1-py2.7-macosx-10.15-x86_64.egg-tmp/QuantLib/_QuantLib.so

I used the syntax pip install QuantLib-Python when I installed QuantLib, the installation appears to be successful.
Any help will be highly appreciated.
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