Notes on how to use Python exec() and eval()

Here are some notes on how to use the exec() and eval() functions in Python:

eval() is used to evaluate a single expression and return the result. The expression can be a string or a code object. It can only contain a single expression, and cannot contain statements such as if, for, or while.
exec() is used to execute a block of code and does not return any value. The code can be a string or a code object, and can contain multiple statements and expressions.
Both eval() and exec() can be used to execute arbitrary code, which can be dangerous if the code is untrusted or comes from an external source. Therefore, you should always be careful when using these functions and make sure that the code being executed is safe.
You can pass a dictionary as the second argument to eval() or exec() to provide a namespace for the code being executed. This allows you to control the environment in which the code runs and prevent it from modifying global variables or accessing sensitive information.
You can use locals() or globals() to access the current local or global namespace, respectively, and pass it as the second argument to eval() or exec().
The compile() function can be used to create code objects from strings, which can be executed using eval() or exec(). This can be useful when you need to execute the same code multiple times with different input values.
eval() and exec() can be used to define functions or classes dynamically at runtime, import modules, or perform other operations that require the execution of multiple statements.

In summary, eval() and exec() are powerful functions that allow you to execute dynamic code at runtime. However, you should be careful when using them and make sure that the code being executed is safe and does not have unintended side effects.

String to code conversion with exec() and eval() in Python:
- Description: Convert strings containing Python code into executable code using exec() and evaluate expressions with eval().
- Code:
```
code_string = "print('Hello, World!')"
eval_result = eval("2 + 3")
exec(code_string)
```