Read a text file line by line and display each word separated by a #.

def process_line(line):
  word = ''
  for c in line:
    if c.isalpha():
      word += c
    else:
      if word:
        print(word, end='#')
        word = ''
  if word:
    print(word, end='#')
  print()
    
with open('filename.txt') as infile:
  for line in infile:
    process_line(line)