aws-saml cannot load readline

I get the following error when i run..

Traceback (most recent call last):
  File "/Users/zaro0508/.virtualenvs/test5/bin/aws-saml", line 8, in <module>
    sys.exit(main())
  File "/Users/zaro0508/.virtualenvs/test5/lib/python3.6/site-packages/awscli_saml/main.py", line 32, in main
    import awscli_saml.assume_role as assume_role
  File "/Users/zaro0508/.virtualenvs/test5/lib/python3.6/site-packages/awscli_saml/assume_role.py", line 7, in <module>
    import readline  # needed for terminal raw mode (> 4096 characters)
ImportError: dlopen(/Users/zaro0508/.virtualenvs/test5/lib/python3.6/readline.so, 2): Library not loaded: /usr/local/opt/readline/lib/libreadline.7.dylib
  Referenced from: /Users/zaro0508/.virtualenvs/test5/lib/python3.6/readline.so
  Reason: image not found

My environment:

➜  pip freeze
awscli-saml==1.1.1
boto3==1.13.6
botocore==1.16.6
docutils==0.15.2
jmespath==0.9.5
python-dateutil==2.8.1
s3transfer==0.3.3
six==1.14.0
urllib3==1.25.9

➜ brew info readline
readline: stable 8.0.4 (bottled) [keg-only]
Library for command-line editing
https://tiswww.case.edu/php/chet/readline/rltop.html
/usr/local/Cellar/readline/8.0.1 (48 files, 1.5MB)
  Poured from bottle on 2019-11-13 at 11:18:27
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/readline.rb

I don't have ver 7 on my machine. The latest version of readline is ver 8.0.1 and and there doesn't seem to be a brew formula for ver 7 to install. Maybe the dependency needs to be updated? Do you know of a workaround?

Not the preferred solution but a workaround that seemed to work for me is to copy the ver 8 lib and name it ver 7.

cp /usr/local/opt/readline/lib/libreadline.8.0.dylib /usr/local/opt/readline/lib/libreadline.7.dylib

ls -l /usr/local/opt/readline/lib/
total 1920
-r--r--r--  1 zaro0508  staff   40396 Nov 13 11:18 libhistory.8.0.dylib
lrwxr-xr-x  1 zaro0508  staff      20 Dec 19  2018 libhistory.8.dylib -> libhistory.8.0.dylib
-r--r--r--  1 zaro0508  staff   46008 Dec 19  2018 libhistory.a
lrwxr-xr-x  1 zaro0508  staff      20 Dec 19  2018 libhistory.dylib -> libhistory.8.0.dylib
-rw-r--r--  1 zaro0508  staff  239220 May  9 08:06 libreadline.7.dylib
-rw-r--r--  1 zaro0508  staff  239220 Nov 13 11:18 libreadline.8.0.dylib
lrwxr-xr-x  1 zaro0508  staff      21 Dec 19  2018 libreadline.8.dylib -> libreadline.8.0.dylib
-r--r--r--  1 zaro0508  staff  406912 Dec 19  2018 libreadline.a
lrwxr-xr-x  1 zaro0508  staff      21 Dec 19  2018 libreadline.dylib -> libreadline.8.0.dylib
drwxr-xr-x  3 zaro0508  staff      96 Nov 13 11:18 pkgconfig

Unfortunately I do not have a Mac and so cannot test this. (I do know that the docker version works on Mac.)

You might try commenting out the import altogether.

aws-cli-saml/awscli_saml/assume_role.py

Line 7 in 1a00dc7

import readline # needed for terminal raw mode (> 4096 characters)

It was needed for input to support more than 4KB.

With 2.0.0, if you provide the SAML response as a env variable or command line parameter, readline is no longer loaded.

thanks @pauldraper. I've verified that this issue was happening when using python ver 3.6.3. I used pyenv to install python ver 3.6.9 and it no longer occurs. I also verified that this error does not happen when using python 3.7.3 and 3.8.0.