code: def test_num_float(self, aug_toks):
      for num in [0.1, 0.3]:
          _ = transforms.swap_chars(aug_toks, num=num)
  
imports: from textacy.augmentation import transforms
  from textacy.augmentation import utils
  from textacy.types import AugTok
  import pytest
label_desc: Use image node_id 3 for calling the TestSwapChars obj's underlying member method code with example usage: obj.test_num_float(aug_toks) without return types