Question

I need a python 3 help

Question 2: Putting it all together.

For this problem, you are going to be working with real data taken from the UCSD library system. You must Regex in this question in order to get credit.

1. Create a pattern to find all books that have a year of N. Note that years are displayed as either N or cN. If a book has both, count them as one occurrence of a book.

def year_match(string, year):
"""Returns whether a string matches a specific year
:param string: a nonempty string
:param year: a positive integer
:returns: a nonnegative integer

>>> file = open("data.txt", "r")
>>> count = 0
>>> for line in file:
... if year_match(line,2002):
... count = count +1
...
>>> count
12
"""

Answer 1

NOTE:

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As the input file format is not given a sample input which is like in the screenshot shown below is used. Please comment what changes you need to make by providing the input file format

INPUT
######

################### PGM START #####################################

import re
import sys

#method to find the count
def year_match(filename, year):
  
    try:
        #open the file
        file = open(filename, "r")  
      
        count = 0
        #for each line in file
        for line in file:
            #for each token in a line
            for token in line.split():
                #check if the token matches the year
                if re.match(year,token):
                    count = count +1
        file.close()
        return count
  
    except FileNotFoundError:
        print('File does not exist')
        sys.exit()
          
#main method
if __name__=="__main__":
    #requestign filename and year from user
    filename=input("Enter the filename: ")
    year=input("Enter the year: ")
  
    #finding the count
    count=year_match(filename,year)

    #printing the count
    print("Number of books with year "+year+" = "+str(count))

###################### PGM END ###############################

OUTPUT
##########