code: def assert_startswith(a, b):
      # produces a better error message than assert_(a.startswith(b))
      assert_equal(a[: len(b)], b)
  
imports: import numpy
  from numpy.lib.mixins import NDArrayOperatorsMixin
  from numpy.testing import assert_, assert_raises
  from numpy.ma.testutils import assert_equal
  from numpy.ma.core import array, arange, masked, MaskedArray, masked_array, log, add, hypot, divide, asarray, asanyarray, nomask
label_desc: Use image node_id 1 for calling a global function with example usage: assert_startswith(a, b) without return types