Bug: boto3 causes SyntaxError when building/invoking with python3.11

[Gmfholley]

Description:

Demonstrated with Hello World python3.11 template.

If you use sam init and choose the python 3.11 'Hello, World' template

1. sam build --use container fails with a source code string cannot contain null bytes error. This happens with no changes to Hello World.
2. sam build and local invoke -e events/event.json succeeds.
3. import boto3 and sam build and local invoke will now fail with the same syntax error.

python3.12 or python3.10 builds succeed in all three scenarios.

Steps to reproduce:

1. sam init
2. Choose Hello World Template
3. Use python3.11 runtime
4. cd into new directory
5. Run sam build --use-container (fails on build step)
   OR
6. Add 'import boto3' to the hello_world/app.py file.
7. Run sam build
8. Run sam local invoke -e events/event.json (fails on invoke step).

Observed result:

• For sam build --use-container --debug
  output

• For sam local invoke -e events/event.json --debug
  output

Expected result:

Expected it to build and return what Hello World is supposed to return, what it returns for python3.10 and python3.12.

Additional environment details (Ex: Windows, Mac, Amazon Linux etc)

1. OS: Mac
2. sam --version:

{
"version": "1.123.0",
"system": {
"python": "3.8.13",
"os": "macOS-14.6.1-x86_64-i386-64bit"
},
"additional_dependencies": {
"docker_engine": "20.10.8",
"aws_cdk": "Not available",
"terraform": "1.5.7"
},
"available_beta_feature_env_vars": [
"SAM_CLI_BETA_FEATURES",
"SAM_CLI_BETA_BUILD_PERFORMANCE",
"SAM_CLI_BETA_TERRAFORM_SUPPORT",
"SAM_CLI_BETA_RUST_CARGO_LAMBDA"
]
}
12. AWS region: us-east-1

[hawflau]

Hi @Gmfholley thanks for raising the issue. I tried your steps to reproduce but it worked fine on my Mac. Can you share the requirements.txt for us to investigate? Thanks!

[Gmfholley]

@hawflau Did either of them reproduce, or just not the second one? I did fail to add that for the second, I imported boto3.

So for exhaustiveness, the requirements.txt for 'Hello World' that failed on the 'build' step was:

requests

and for importing boto3 was:

requests
boto3

[Gmfholley]

I tested again, and was again able to reproduce the issue. But since you weren't, I decided to completely delete all Docker volumes and data, and that fixed it. Something must have been broken in my container.

I'm sorry for the bug report. Hopefully this can help someone else.

[github-actions]

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