import re
import argparse

# parse input arguments
parser = argparse.ArgumentParser()
parser.add_argument('path_to_file', help = 'path to the csv file')
args = parser.parse_args()

# open file, add all lines to a single string
file_given = open(args.path_to_file)
f = ""
for line in file_given:
    f += line + " "
file_given.close()

# remove non-alphabetic characters, replace all whitespace characters with a 
# single whitespace, and change all uppercase characters to lowercase
f = re.sub(r'[^a-zA-Z\s]', r'', f)
f = re.sub(r'\s+', r' ', f)
f = f.lower()

print(f)