Update collections import for Python 3.10

[kr0p07k1n]

Python 3.10 deprecated collections classes generic in favour of collections.abc.

[oDn]

Are these changes backward compatible with older versions of Python ?

[kr0p07k1n]

Yes these changes are backward compatible with older versions of Python. The try except block ensures that, if importing collections.abc fails, it falls back on the older import of collections.