code: def append_character(c):
      return lambda v: v + c
  
file_path: sonnet/sonnet/src/sequential_test.py
imports: from absl.testing import parameterized
  from sonnet.src import sequential
  from sonnet.src import test_utils
  import tensorflow
label_desc: Use image node_id 2 for calling a global function with example usage: append_character(c) and returns: function