code: def test_error_with_prefix_sep_wrong_type(dummies_basic):
      with pytest.raises(
          TypeError,
          match=(
              r"Expected 'sep' to be of type 'str' or 'None'; "
              r"Received 'sep' of type: list"
          ),
      ):
          from_dummies(dummies_basic, sep=["_"])
  
imports: import numpy
  import pytest
  from pandas import DataFrame, Series, from_dummies, get_dummies
  import pandas._testing
label_desc: Use image node_id 10 for calling a global function with example usage: test_error_with_prefix_sep_wrong_type(dummies_basic) without return types