code: def test_count(any_string_dtype):
      ser = Series(
          ["foo", "foofoo", np.nan, "foooofooofommmfoo"],
          dtype=any_string_dtype,
      )
      result = ser.str.count("f[o]+")
      expected_dtype = (
          np.float64
          if any_string_dtype in object_pyarrow_numpy
          else "Int64"
      )
      expected = Series([1, 2, np.nan, 4], dtype=expected_dtype)
      tm.assert_series_equal(result, expected)
  
imports: from datetime import datetime, timedelta
  import numpy
  import pytest
  from pandas import DataFrame, Index, MultiIndex, Series
  import pandas._testing
  from pandas.core.strings.accessor import StringMethods
  from pandas.tests.strings import object_pyarrow_numpy
label_desc: Use image node_id 3 for calling a global function with example usage: test_count(any_string_dtype) without return types