Import webbrowser only when necessary

[jefferyto]

Hello 👋 I'm one of the Python maintainers for the OpenWrt packages feed. We have a user who wrote a script using MSAL and encountered an import error for webbrowser when run on their device (openwrt/packages#14198).

While the webbrowser module is part of the Python standard library, we don't ship webbrowser in our Python package to save disk space. AFAIK there also is no web browser package available for OpenWrt.

I see that webbrowser is only used in one place (_browse() in msal/oauth2cli/authcode.py). Would you be willing to accept a PR to move the import webbrowser statement into _browse()? This should fix the import error for the user (their script is non-interactive and does not need to open a browser) and allow our Python package to continue to not ship the webbrowser module.

[rayluo]

@jefferyto Thanks for bringing this to our attention. Will that PR work?

[jefferyto]

Yes that should work - thanks!