old_contents: import textwrap
  
  
  def test_environ(script, tmpdir):
      """$PYTHONWARNINGS was added in python2.7"""
      demo = tmpdir.joinpath('warnings_demo.py')
      demo.write_text(textwrap.dedent('''
          from logging import basicConfig
          from pip._internal.utils import deprecation
  
          deprecation.install_warning_logger()
          basicConfig()
  
          deprecation.deprecated("deprecated!", replacement=None, gone_in=None)
      '''))
  
      result = script.run('python', demo, expect_stderr=True)
      expected = 'WARNING:pip._internal.deprecations:DEPRECATION: deprecated!\n'
      assert result.stderr == expected
  
      script.environ['PYTHONWARNINGS'] = 'ignore'
      result = script.run('python', demo)
      assert result.stderr == ''
  
new_contents: import textwrap
  
  
  def test_environ(script, tmpdir):
      demo = tmpdir.joinpath('warnings_demo.py')
      demo.write_text(textwrap.dedent('''
          from logging import basicConfig
          from pip._internal.utils import deprecation
  
          deprecation.install_warning_logger()
          basicConfig()
  
          deprecation.deprecated("deprecated!", replacement=None, gone_in=None)
      '''))
  
      result = script.run('python', demo, expect_stderr=True)
      expected = 'WARNING:pip._internal.deprecations:DEPRECATION: deprecated!\n'
      assert result.stderr == expected
  
      # $PYTHONWARNINGS was added in python2.7
      script.environ['PYTHONWARNINGS'] = 'ignore'
      result = script.run('python', demo)
      assert result.stderr == ''
  
subject: Move docstring to appropriately placed comment