Function definitions are not permitted in this context什麼意思

The phrase "function definitions are not permitted in this context" is a message that indicates that you are trying to define a function in a context where it is not allowed. This message can appear in a variety of programming languages and development environments, but it is most commonly seen in interpreted languages like Python or in interactive development environments (IDEs) where code is being executed line by line.

For example, in Python, function definitions typically occur at the top level of a module or inside a class definition. If you try to define a function inside a loop or a conditional statement, you will get an error message indicating that function definitions are not allowed in that context.

Here's an example of a situation where you might see this error in Python:

for i in range(5):
    def my_function():
        print("Hello, world!")
        # This function definition is not allowed inside the loop.

In this example, the interpreter would raise an error because function definitions are not allowed inside loops. To define a function, you need to do so at the top level of a module or inside a class definition.

If you encounter this error, you will need to move the function definition to a valid context or restructure your code to ensure that function definitions are allowed.