ModuleNotFoundError: No module named aws_cdk

Question

When I run cdk deploy, I get the following error:

Traceback (most recent call last):
  File "app.py", line 3, in <module>
    from aws_cdk import core
ModuleNotFoundError: No module named 'aws_cdk'

I installed cdk with npm

npm install -g aws-cdk

I activated the virtual env by

source .env/bin/activate

I'm using python3.8. I installed aws_cdk dependencies by

pip install -r requirements.txt

When editing the python files, I am able to import aws_cdk and run individual functions successfully. I think the problem is that cdk is located in the /usr directory:

> which cdk
/usr/local/bin/cdk

And I think it's using python from my /usr/bin instead of virtual env. How do I make cdk use python in my virtual environment?

EDIT:

requirements.txt

-e .

Thanks for adding the requirements.txt. I setup a python project from scratch with CDK 1.55.0. Executed also the steps you mentioned (as they are also shown when creating a new python project with the cdk) and was able to run `cdk synth` and `cdk deploy` without any issue. My python version is 3.8.2 and the cdk is available under `/usr/local/bin/cdk` Can you try to activate the virtual environment, do a `cdk synth` and then do a `which python`? — Stefan Freitag, Jul 31 '20 at 18:42
@StefanFreitag which python points to `/.env/bin/python`. I think something went wrong with the `npm` installation. If I use `/usr/bin/python`, everything works fine, but when it points to my `.env/bin/python`, I get that error. — MoneyBall, Aug 01 '20 at 02:21
The `.env/bin/python` is the one that is working for me and with the `/usr/bin/python` I get the error about the missing module. If it is the other way around for you I am running out of ideas. — Stefan Freitag, Aug 01 '20 at 20:27
Faced the same issue. Doing an `rm -rf` on existing `venv` and then re-creating it resolved the problem. — narayan, Jan 20 '21 at 12:37

score 12 · Answer 1 · answered Oct 24 '20 at 00:07

12

TLDR; .env/bin/pip3.8 install -r requirements.txt solved this same issue at my end

Once you run source .env/bin/activate it actually looks for python libraries on .env/lib/python3.8/site-packages (at least for me!). Thus running cdk ls which calls app.py will looks for aws_cdk in venv site package, not from system site-package as long as "include-system-site-packages = false" under .env/pyvenv.cfg

answered Oct 24 '20 at 00:07

bigbro

163
1
7

In my case what worked was: sudo .venv/bin/pip3.8 install -r requirements.txt – Graham Hesketh Dec 20 '21 at 09:42

score 8 · Answer 2 · answered Sep 15 '20 at 13:36

8

I think you have to order

python -m pip install -r requirements.txt

This will install the standard dependencies for your CDK project.

answered Sep 15 '20 at 13:36

P. Str

580
1
5
18

score 3 · Answer 3 · edited Jul 29 '20 at 10:10

3

You have to re-install the aws_cdk in virutal Env. I hope its works

edited Jul 29 '20 at 10:10

Roshin Raphel

2,612
4
22
40

answered Jul 29 '20 at 09:54

Yogesh Kumar Wadhwa

49
5

1

I got the same error - `ModuleNotFoundError: No module named 'aws_cdk'` – MoneyBall Jul 31 '20 at 11:21
Does your current directory contain a file called aws_cdk.py? – Yogesh Kumar Wadhwa Jul 31 '20 at 12:35
I don't have that file in my directory. – MoneyBall Aug 01 '20 at 02:22

score 3 · Answer 4 · answered Feb 11 '22 at 10:39

3

install via cmd as below.

pip install aws-cdk.core

or

add following line in requirements.txt file

aws-cdk.core

it should resolved

answered Feb 11 '22 at 10:39

Shahabaj S. Shaikh

78
2

score 1 · Answer 5 · answered Nov 19 '21 at 21:37

Came here with the same issue, but as Geremy hints at another reason. On mac, when brew updates the python version it basically breaks your existing virtual environments. The python version that CDK picks isn't the one you necessarily built the virtual environment with.

inserted this into my app.py to get to the bottom of this:

import sys
print(sys.path)

helped tshoot.

score 1 · Answer 6 · answered Jul 13 '22 at 15:04

1

For CDK v2, the core modules is integrated inside aws_cdk and you do not have to import aws_cdk.core. You may remove it or replace 'aws_cdk.core' with just 'aws_cdk'

answered Jul 13 '22 at 15:04

JustP

11
1

Your answer could be improved with additional supporting information. Please [edit] to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – Community Jul 14 '22 at 21:09

score 0 · Answer 7 · answered Oct 12 '21 at 13:42

0

I got this error when I moved my directory structure around. I was able to fix it by editing .venv/bin/activate and updating the value of the VIRTUAL_ENV env var.

answered Oct 12 '21 at 13:42

Geremy

2,415
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score 0 · Answer 8 · answered Jul 28 '22 at 10:08

0

python -m pip install aws-cdk-lib

answered Jul 28 '22 at 10:08

Branford T. Gbieor

39
3

score 0 · Answer 9 · answered Oct 15 '22 at 14:50

0

I ran in to a similar problem which was fixed when I re-ran npm install. I see that you did that, however maybe running it again might help now, as it did for me.

answered Oct 15 '22 at 14:50

Michael Behrens

911
10
8

score -1 · Answer 10 · answered Aug 25 '20 at 03:43

-1

You should run it in virtual environment.

source .env/bin/activate

then

cdk deploy

answered Aug 25 '20 at 03:43

user14161182

1

ModuleNotFoundError: No module named aws_cdk

10 Answers10