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