(var_list, default)
return default
Look up a key in the environment, with fallback to secondary keys
  and finally falling back to a default value.
Look up a key in the environment, with fallback to secondary keys
  and finally falling back to a default value.
Look up a key in the environment with fallback to secondary keys and finally falling back to a default value .
def GetEnvironFallback(var_list, default):
  """Look up a key in the environment, with fallback to secondary keys
  and finally falling back to a default value."""
  for var in var_list:
    if var in os.environ:
      return os.environ[var]
  return default
def GetEnvironFallback ( var_list , default ) : for var in var_list : if var in os . environ : return os . environ [ var ] return default