Question: How do you test if a filename ( given as a string ) has an extension of . png , . jpg

How do you test if a filename (given as a string) has an extension of ".png",".jpg" or ".gif"?
if filename.endswith(".png" or ".jpg" or ".gif") :
if filename. endswith(".png") or filename. endswith(".jpg") or filename. endswith(".gif") :
if ".png" in filename or ".jpg" in filename or ".gif" in filename :
if filename. contains(".jpg",".gif", ".png") :
How do you test if a filename (given as a string)

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