code: def test_keepalive_time_update(self):
      _cache = interfaces.cache._Cache()
  
      # The default
      self.assertEqual(_cache.keepalive_time, 0.1)
  
      _cache.set_keepalive_time(0.3)
      self.assertEqual(_cache.keepalive_time, 0.3)
  
      _cache.set_keepalive_time(10.0)
      self.assertEqual(_cache.keepalive_time, 10.0)
  
      _cache.set_keepalive_time("0.2")
      self.assertEqual(_cache.keepalive_time, 0.2)
  
      with self.assertRaises(ValueError):
          _cache.set_keepalive_time("foo")
  
      with self.assertRaises(TypeError):
          _cache.set_keepalive_time([])
  
imports: import copy
  import sys
  from pyfftw import interfaces, builders
  import pyfftw
  import numpy
  import numpy
  import unittest
  from .test_pyfftw_base import run_test_suites, miss
  from .test_pyfftw_numpy_interface import InterfacesNumpyFFTTestFFT
  import threading
  import time
  import os
  import hashlib
label_desc: Use image node_id 5 for calling the CacheTest obj's underlying member method code with example usage: obj.test_keepalive_time_update() without return types