Examine the following three functions that take as argument a file name and return the extension of that file. For instance, if the file name is 'myfile.tar.gz' the returned value of the function should be 'gz'. If the file name has no extention, i.e. when the file name is just 'myfile', the function should return an empty string.def get_extension1(filename): return(filename.split(".")[-1]) def get_extension2(filename): import os.path return(os.path.splitext(filename)[1]) def get_extension3(filename): return filename[filename.rfind('.'):][1:]Which of the these functions are doing exactly what they are supposed to do according to the description above?get_extension3 onlyget_extension2 onlyNone of them.get_extension1 only

Answered: Examine the following three functions…

C++ for Engineers and Scientists

4th Edition

ISBN:9781133187844

Author:Bronson, Gary J.

Publisher:Bronson, Gary J.

Chapter8: I/o Streams And Data Files

Section8.4: File Streams As Function Arguments

Problem 3E

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Examine the following three functions that take as argument a file name and return the extension of that file. For instance, if the file name is 'myfile.tar.gz' the returned value of the function should be 'gz'. If the file name has no extention, i.e. when the file name is just 'myfile', the function should return an empty string.

def get_extension1(filename):
return(filename.split(".")[-1])
def get_extension2(filename):
import os.path
return(os.path.splitext(filename)[1])
def get_extension3(filename):
return filename[filename.rfind('.'):][1:]

Which of the these functions are doing exactly what they are supposed to do according to the description above?

get_extension3 only
get_extension2 only
None of them.
get_extension1 only

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