Fixed newline SyntaxError

Added some prompting to the python tool to resolve SyntaxError: unterminated string literal where multi-line code strings are not processed correctly if they're not formatted in compliance with Python's string literal rules. Specifically, the interpreter fails when the code string starts with a newline right after the opening quote or doesn't use triple quotes for multi-line code snippets. This leads to an unended string literal error because the interpreter expects a complete string format as per Python syntax rules.

codeinterpreterapi/session.py

@@ -109,6 +109,8 @@ def _tools(self, additional_tools: list[BaseTool]) -> list[BaseTool]:
                 "Write the entire code in a single string. This string can "
                 "be really long, so you can use the `;` character to split lines. "
                 "Start your code on the same line as the opening quote. "
+                "Do not start your code with a line break. "
+                "For example, do 'import numpy', not '\\nimport numpy'."
                 "Variables are preserved between runs. "
                 + (
                     (