How Can I Capture and Print a Python Exception Traceback Without Stopping Program Execution?

Preserving Exception Traceback without Program Termination

When handling exceptions in Python, you may encounter situations where you want to capture and print the full traceback without interrupting the program flow. The default except block only provides the exception object, which does not include the detailed traceback that is normally displayed when an exception is raised.

Solution using traceback.format_exc()

To obtain the complete traceback, you can utilize the traceback.format_exc() function, which generates a formatted string representing the stack trace of the current exception.

import traceback

def do_stuff():
    raise Exception("test exception")

try:
    do_stuff()
except Exception:
    print(traceback.format_exc())

Output

This code will produce the following output, mirroring the traceback printed when the exception is raised without the try/except block:

Traceback (most recent call last):
  File "<stdin>", line 5, in <module>
  File "<stdin>", line 3, in do_stuff
Exception: test exception

Using traceback.format_exc() allows you to capture and print the entire traceback without halting or exiting the program, ensuring that you have access to detailed diagnostic information while maintaining uninterrupted execution. This technique is particularly useful for logging and debugging purposes.

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