Design a Python function called `print_test_metrics()` that aims to resolve errors in a provided code snippet, which intends to display the string representation of a specific variable called `test_metrics`. Your responsibility is to debug the given code and rectify any potential errors to ensure it can execute flawlessly.

Take note that you have the freedom to modify the code snippet exclusively within the `print_test_metrics()` function. However, refrain from altering any code outside this function or introducing additional code.

In addition to debugging the code, you must also implement error handling for cases where the `test_metrics` variable is not defined. If `test_metrics` is not defined, the function should print an error message indicating that the variable is missing. 

Furthermore, you need to ensure that the error message includes the exact line number where the error occurred in the code snippet. The error message should also provide a suggestion to define the `test_metrics` variable and assign it an appropriate value before calling the `print_test_metrics()` function.
user
Sure, here's one way you could implement the `print_test_metrics()` function with error handling:

```python
def print_test_metrics():
    global test_metrics  # Assuming test_metrics is a global variable

    if not test_metrics:
        line_number = sys.exc_info()[2].tb_lineno
        print(f"Error: missing variable 'test_metrics'. Please define and assign a value before calling print_test_metrics() on line {line_number}.")
    else:
        print(test_metrics)
```

This function uses the `sys.exc_info()` method to get information about the most recent exception from the call stack. The `tb_lineno` attribute gives the absolute line number where the exception occurred.

Note that this works assuming `test_metrics` is a global variable. If it's a local variable in the function call, you may need to pass it as an argument to `print_test_metrics()` and check if it's defined there.
assistant
Design a Python function called `print_test_metrics()` that aims to resolve errors in a provided code snippet, which intends to display the string representation of a specific variable called `test_metrics`. Your responsibility is to debug the given code and rectify any potential errors to ensure it can execute flawlessly.

Take note that you have the freedom to modify the code snippet exclusively within the `print_test_metrics()` function. However, refrain from altering any code outside this function or introducing additional code.

In addition to debugging the code, you must also implement error handling for cases where the `test_metrics` variable is not defined. If `test_metrics` is not defined, the function should print an error message indicating that the variable is missing. 

Furthermore, you need to ensure that the error message includes the exact line number where the error occurred in the code snippet. The error message should also provide a suggestion to define the `test_metrics` variable and assign it an appropriate value before calling the `print_test_metrics()` function.
user
Sure, here is the Python function `print_test_metrics()` that resolves potential errors and includes error handling:

```python
def print_test_metrics():
    try:
        print(test_metrics)
    except NameError as e:
        import sys
        line_number = sys.exc_info()[-1].tb_lineno
        error_message = f"NameError: name 'test_metrics' is not defined. Define 'test_metrics' variable and assign an appropriate value before calling print_test_metrics() function. Error occurred at line number: {line_number}"
        print(error_message)
```

This function uses a try-except block to catch any `NameError` that occurs when `test_metrics` is not defined. If a `NameError` is caught, it imports the `sys` module to get the line number where the error occurred, then prints a custom error message that includes this line number and a suggestion to define `test_metrics`.
assistant