code: def _env_del(name):
      """
        Unsets the given environment variable if it is currently set.
  
        Note that we can not use os.environ.pop() or os.environ.clear() here
      since prior to Python 2.6 these functions did not remove the actual
      environment variable by calling os.unsetenv().
  
      """
      try:
          del os.environ[name]
      except KeyError:
          pass
  
file_path: turicreate/src/external/boost/boost_1_68_0/tools/build/test/configuration.py
imports: import BoostBuild
  import TestCmd
  import os
  import os.path
  import re
label_desc: Use image node_id 3 for calling a global function with example usage: _env_del(name) without return types