返回数据的run_result.stdout，似乎有长度限制，超长会被截取

[DemonWitch]

我执行了一段python代码，返回的json数据会比较长，目前观察的情况是json被截取了，获得的是不完整的json字符串，截取后的长度是160910个字符

[cai-jianfeng]

This is likely caused by the stdout buffer being full, which prevents the remaining output from being written.
When executing code that produces large outputs (like your 160910+ character JSON), the default stdout buffer has a size limit. Once the buffer is filled, additional output gets truncated silently.
I encountered similar issues when working with competitive programming test case generation, where generators/checkers can produce substantial outputs. In my fork of SandboxFusion, I've addressed this buffer limitation issue:
https://github.com/cai-jianfeng/SandboxFusion
Feel free to take a look at how we handled large stdout outputs there. Hope this helps!