Add augmented assignment operator support to InternalPythonInterpreter

[Copilot]

InternalPythonInterpreter raised "AugAssign is not supported" when encountering augmented assignment operators (+=, -=, *=, etc.), breaking code execution for common Python patterns.

from camel.prompts import CodePrompt
from camel.interpreters import InternalPythonInterpreter

# Previously failed with "AugAssign is not supported"
code_prompt = CodePrompt("a = 1 + 1\na += 1", code_type="python")
output = code_prompt.execute(interpreter=InternalPythonInterpreter())
# Now returns: 3

Changes

• Added _execute_augassign method - Handles all augmented assignment operators (+=, -=, *=, /=, //=, %=, **=, <<=, >>=, |=, ^=, &=, @=)
• Updated AST dispatcher - Routes ast.AugAssign nodes to the new handler
• Updated tests - Replaced failing test with comprehensive validation of augmented assignment operations

The implementation follows the existing pattern used for binary operators in _execute_binop.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[BUG] AugAssign is not supported in PythonInterpreter</issue_title>
<issue_description>### Required prerequisites

• I have read the documentation https://camel-ai.github.io/camel/camel.html.
• I have searched the Issue Tracker and Discussions that this hasn't already been reported. (+1 or comment there if it has.)
• Consider asking first in a Discussion.

What version of camel are you using?

0.1.1

System information

3.10.11 (main, May 15 2023, 19:29:30) [Clang 14.0.6 ] darwin
0.1.1

Problem description

1 code_prompt = CodePrompt("a = 1 + 1\na += 1", code_type="python")
----> 2 output, state = code_prompt.execute()


InterpreterError: Evaluation of the code stopped at node 1. See:
AugAssign is not supported.

Reproducible example code

The Python snippets:

Command lines:

Extra dependencies:

Steps to reproduce:

Traceback

No response

Expected behavior

No response

Additional context

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

@dandansamax Thank you for your feedback! BTW, #400 changes the default code interpreter to subprocess interpreter. It can be a work around. Could you please check that?

• Fixes [BUG] AugAssign is not supported in PythonInterpreter #418

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[waleedalzarooni]

LGTM