old_contents: import re
  
  # Replaces all text found using the regular expression to_replace with the supplied replacement.
  def replace_text(file, to_replace, replacement):
    with open(file, "r") as conf:
      contents = conf.read()
    replaced_text = re.sub(to_replace, replacement, contents)
    with open(file, "w") as f:
      f.write(replaced_text)
  
new_contents: import re
  
  # Replaces all text found using the regular expression to_replace with the supplied replacement.
  def replace_text(file, to_replace, replacement):
      with open(file, "r") as conf:
          contents = conf.read()
      replaced_text = re.sub(to_replace, replacement, contents)
      with open(file, "w") as f:
          f.write(replaced_text)
  
subject: Fix indent.