No module named 'psycopg2'

Question

Despite this being one of only two pre-installed Python modules (https://docs.aws.amazon.com/mwaa/latest/userguide/working-dags-dependencies.html), I'm getting this error (No module named 'psycopg2') with a test DAG. It's from the following import:  
from airflow.operators.postgres_operator import PostgresOperator  
  
This service isn't listed in the Support Ticket drop-down yet, so I'm hoping somebody here might have an idea!  
  
BTW, I don't think these submodules should have an impact on the availability of psycopg2, but here's my requirements.txt file.  
  
(All in the form "apache-airflow bracket submodule bracket", reformatted for this post)  
amazon  
postgres  
mysql  
docker  
slack  
crypto  
  
Thanks for your time,  
Tim  
  
Edited by: TKnight-HG on Dec 1, 2020 11:21 AM  
  
Edited by: TKnight-HG on Dec 1, 2020 11:23 AM

Answer

Hi,  
  
For additional information on the topic please see:  
  
https://docs.aws.amazon.com/mwaa/latest/userguide/troubleshooting.html#missing-postgres  
  
https://docs.aws.amazon.com/mwaa/latest/userguide/working-dags-dependencies.html  
  
Thanks!

Answer

We have followed the troubleshooting guide and are still receiving the same error. Are there any other resources we can reference in order to resolve this issue?

Answer

Hi!  
  
If any of your requirements fail, then the rest will quit loading.  There will be better logging in the near future, however in the interim please try removing apache-airflow bracket crypto bracket from the list as it looks like that is the one that is failing.  
  
Thanks!  
  
Edited by: JohnJ-AWS on Jan 6, 2021 1:33 PM

Answer

My requirements.txt file contained an error on the "postgres" Extra package (a space was inside the bracket). Fixing that line and properly updating the environment to point to the new version of the file solved the problem.

No module named 'psycopg2'

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