input: Write a function to list the contents of a directory using Python. The function should return a list of strings where each string is a file or directory name.
  
  import os
  
  def list_directory_contents():
      return os.listdir()
  
  ### Tests:
  assert list_directory_contents() == ['file1.txt', 'file2.txt', 'dir1', 'dir2']
  assert list_directory_contents() == ['file.txt', 'subdir', 'image.png']
  assert list_directory_contents() == []
  assert list_directory_contents() == ['test.py', 'README.md']
  assert list_directory_contents() == ['file1', 'dir1', 'file2']
output: def list_directory_contents():
      return os.listdir()