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

[Christofer B. <bog...@gm...>]

Appears to me that installing Quantlib in Mac-Python3 is
frustratingly difficult and there are many breakpoints.

I reinstalled Python and QuantLib altogether. With the new installation -

>>> import sys

>>> sys.path

['', '/Library/Frameworks/Python.framework/Versions/3.6/lib/python36.zip',
'/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6',
'/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/lib-dynload',
'/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages',
'/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/setuptools-33.1.1-py3.6.egg']

>>> import QuantLib

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

  File
"/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/QuantLib/__init__.py",
line 21, in <module>

    from .QuantLib import *

  File
"/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/QuantLib/QuantLib.py",
line 13, in <module>

    from . import _QuantLib

ImportError: cannot import name '_QuantLib'

And now it is failing with a new reason!!!


On Thu, Aug 13, 2020 at 11:11 PM Luigi Ballabio <lui...@gm...>
wrote:

> From inside Python, try
>
> import sys
> print(sys.path)
>
> The list you get should include /usr/local/lib/python3.8/site-packages,
> where pip3 installed QuantLib.  If not, you might have some configuration
> to do.
>
> On Thu, Aug 13, 2020 at 7:09 PM Christofer Bogaso <
> bog...@gm...> wrote:
>
>> It would be better if I can load QuantLin with Python3.
>>
>> I failed to use some of the packages with Python2 (2.7.16) like
>> matplotlib. Thanks,
>>
>> On Thu, Aug 13, 2020 at 8:09 PM Javid Ashraff <jav...@ya...>
>> wrote:
>>
>>> 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 QuantLibTraceback (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.
>>>
>>> Thanks,
>>> _______________________________________________
>>> QuantLib-users mailing list
>>> Qua...@li...
>>> https://lists.sourceforge.net/lists/listinfo/quantlib-users
>>>
>>> _______________________________________________
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>>> Qua...@li...
>>> https://lists.sourceforge.net/lists/listinfo/quantlib-users
>>>
>>