With as impl w/ for

why_with.py

# Why is there a with construct, when you can build it with
# for loop and yield?
# 
# ;)

def open_f(filename, mode):
  try:
    f = open(filename, mode)
    yield f
  finally:
    try:
      f.close()
    except:
      pass

def read_lines(filename):
  for f in open_f(filename, 'r'):
    for line in f:
      yield line

for line in read_lines('testfile'):
  print("line: " + line.rstrip("\n"))