Get the summation of dollar amounts found in a text file

text_calc.py

#!/usr/bin/env python

# Calculate dollar values of a text file with python
# -- Cole Hocking

import re
from sys import argv, exit
import os.path as opath

def validateFile(filei):
    """
    Check for file_exists
    """
    if opath.isfile(filei):
        return True
    else:
        print("%r not found" % (filei))
        exit(1)

def getValue(file_name):
    """
    Returns the total
    """
    # Dollar value '\d' is decimal
    pattern = re.compile("\$[0-9]+(?:,{1}[0-9]+)*(?:\.\d{2})?")

    with open(file_name, "r") as sFile:
        total = 0
        for line in sFile:
            #lineNo = sFile.index(line)
            nums = pattern.findall(line)
            for n in nums:
                # s is now the list of the splits; we want the 0 position
                print("Found: %s" % n)
                # Take the dollars out for valid float
                n = n.replace('$', '')
                # Take the commas out too
                n = n.replace(',', '')
                s = float(n) # convert to float
                total += s
      return total
                
def main(argv):

    if len(argv) != 2:
        print("Usage: ./text_calc.py <file-to-parse>")
        exit(1)

    assert(validateFile(argv[1]))

    total = getValue(argv[1])
    print("-----------------------")
    print("Total value is ${:,.2f}".format(total))

if __name__ == "__main__":
    main(argv)