Python 3.1 - 3.5

Certain machine parts are assigned serial numbers. Valid serial numbers are of the form: SN/nnnn-nnn where n represents a digit. Write a function valid_sn that takes a string as a parameter and returns True if the serial number is valid and False otherwise.

For example, the input "SN/5467-231" returns True "SN5467-231" returns False

"SN/5467-2231" returns False

Using this function, write and test another function valid-sn-file that takes three file handles as input parameters. The first handle is to the file contains a list of serial numbers, the second and third are to output files. Write all valid serial numbers to the second file handle and invalid serial numbers to the third.

txt file:

Boston Americans New York Giants Chicago White Sox Chicago Cubs Chicago Cubs Pittsburgh Pirates Philadelphia Athletics Philadelphia Athletics Boston Red Sox Philadelphia Athletics Boston Braves Boston Red Sox Boston Red Sox Chicago White Sox Boston Red Sox Cincinnati Reds Cleveland Indians New York Giants New York Giants New York Yankees Washington Senators Pittsburgh Pirates St. Louis Cardinals New York Yankees New York Yankees Philadelphia Athletics Philadelphia Athletics St. Louis Cardinals New York Yankees New York Giants St. Louis Cardinals Detroit Tigers New York Yankees New York Yankees New York Yankees New York Yankees Cincinnati Reds New York Yankees St. Louis Cardinals New York Yankees St. Louis Cardinals Detroit Tigers St. Louis Cardinals New York Yankees Cleveland Indians New York Yankees New York Yankees New York Yankees New York Yankees New York Yankees New York Giants Brooklyn Dodgers New York Yankees Milwaukee Braves New York Yankees Los Angeles Dodgers Pittsburgh Pirates New York Yankees New York Yankees Los Angeles Dodgers St. Louis Cardinals Los Angeles Dodgers Baltimore Orioles St. Louis Cardinals Detroit Tigers New York Mets Baltimore Orioles Pittsburgh Pirates Oakland Athletics Oakland Athletics Oakland Athletics Cincinnati Reds Cincinnati Reds New York Yankees New York Yankees Pittsburgh Pirates Philadelphia Phillies Los Angeles Dodgers St. Louis Cardinals Baltimore Orioles Detroit Tigers Kansas City Royals New York Mets Minnesota Twins Los Angeles Dodgers Oakland Athletics Cincinnati Reds Minnesota Twins Toronto Blue Jays Toronto Blue Jays Atlanta Braves New York Yankees Florida Marlins New York Yankees New York Yankees New York Yankees Arizona Diamondbacks Anaheim Angels Florida Marlins Boston Red Sox Chicago White Sox St. Louis Cardinals Boston Red Sox Philadelphia Phillies