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pythonpython-2.7python-module

What happens when an exception occurs in a module initialization

I have a module, and in this module I initialize some variables as soon as the module is imported.

my_mobule.py:

def _build_service():
    # ...do some stuffs

_service = _build_service()

In this case, what will happen if the _build_service method raises an exception? And how my module can recover from an exception and try to invoke the _build_service again?

Thank you guys.

Solution

  • It's pretty similar to the behaviour should you call a function which raises an exception - if you don't handle the exception in the module itself, then it will be simply bump up the stack to whoever imported your module.

    That would look like this:

    >>> import my_mobule  # sic
UhohError: something went wrong

    If you have an opportunity to handle it in the module, you could do it like so:

    try:
    _service = _build_service()
except UhohError:
    # your handling code here