transparency.py

def writeFile(filename, contents):
  with open(filename, "w") as f:
    f.write(contents)

def readFile(filename):
  contents = ""
  with open(filename, "r") as f:
    contents = f.read()
    return contents
  
def p1():
  file = "/tmp/file"
  
  writeFile(file, "abcdef")
  x = readFile(file)
  print(x)
  writeFile(file, "ghijkl")
  y = readFile(file)
  print (x + y)
  
def p2():
  file = "/tmp/file"
  expr = readFile(file)
  
  writeFile(file, "abcdef")
  x = expr
  print(x)
  writeFile(file, "ghijkl")
  y = expr
  print (x + y)