Question: python 1: Write a function which could return the filename's extend name. It accepts one argument.(xx.txt.doc. XX.Ex.xx.xls.ppt.doc) If the argument is not a valid filename,

python

1: Write a function which could return the filename's extend name. It accepts one argument.(xx.txt.doc. XX.Ex.xx.xls.ppt.doc) If the argument is not a valid filename, it should return it is a invalid filename

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