python - importing user defined library in redshift UDF -

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here trying import library inside user defined python function in redshift

i have created library called nltk follows 

[create or replace library nltk language plpythonu 's3://nltk.zip' credentials 'aws_access_key_id=*****;aws_secret_access_key=****';]

once created tried import in function as

create  or replace function f_function (sentence varchar)     returns varchar stable $$     nltk import tokenize     token = nltk.word_tokenize(sentence)     return token $$ language plpythonu;

tokenize sub directory inside nltk library

but when try run function calling on table as

select f_function(text) table_txt;

i getting error such

amazon invalid operation: importerror: no module named nltk. please @ svl_udf_log more information
details:
-----------------------------------------------
error: importerror: no module named nltk. please @ svl_udf_log more information
code: 10000
context: udf
query: 69145
location: udf_client.cpp:298
process: query0_21 [pid=3165]

can me doing wrong?

first, there obvious problem python code: never importing nltk, , calling nltk.word_tokenize.

second, after downloading nltk package, need zip module folder inside package , upload zip redshift.

nltk-x.y.zip ├─ setup.py ├─ requirements.txt ├─ nltk <- folder should zipped , uploaded s3 ...  ├─ __init__.py      ├─ tokenize.py

redshift can load modules -- root folder should have __init__.py file. http://docs.aws.amazon.com/redshift/latest/dg/udf-python-language-support.html


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