code: def _cast_inplace(terms, acceptable_dtypes, dtype):
      
      dt = np.dtype(dtype)
      for term in terms:
          if term.type in acceptable_dtypes:
              continue
  
          try:
              new_value = term.value.astype(dt)
          except AttributeError:
              new_value = dt.type(term.value)
          term.update(new_value)
docs: Cast an expression inplace.
  
      Parameters
      ----------
      terms : Op
          The expression that should cast.
      acceptable_dtypes : list of acceptable numpy.dtype
          Will not cast if term's dtype in this list.
  
          .. versionadded:: 0.19.0
  
      dtype : str or numpy.dtype
          The dtype to cast to.