use python to write and submit a script that asks for a filename (to which mbox.txt and mbox-short.txt will be used) and looks for lines of the form

New Revision: 39772

Extract the number from each of the lines using a regular expression and the findall() method. Compute the average of the numbers, rounded to a single decimal place, and print out the average and the number of lines used for the computation.

Enter filename: mbox.txt

Average = 38549.8

Number of lines = 1790

Enter filename: mbox-short.txt

Average = 39756.9

Number of lines = 27