REF: more explicit dtypes in strings.accessor #41727
Conversation
simonjayhawkins
added
Refactor
pandas/core/strings/accessor.py
Outdated
| """ | ||
| result = self._data.array._str_startswith(pat, na=na) | ||
| return self._wrap_result(result, returns_string=False) | ||
| return self._wrap_result(result, returns_string=False, returns_bool=True) |
There was a problem hiding this comment.
can we just change _wrap_result so we don't have 2 keywords? maybe rename to returns_dtype and pass a string?
There was a problem hiding this comment.
thats tough bc the end-result dtype depends on self._is_string
There was a problem hiding this comment.
Looking at this again it really doesnt look worth the trouble to try to combine these args
There was a problem hiding this comment.
I don't think either keywords should really be necessary here, the issue is that the arrays passed when expand is True are object arrays of lists/tuples
which method returns bool, where the dtype of the result is not bool?
There was a problem hiding this comment.
which method returns bool, where the dtype of the result is not bool?
makes sense, ill give this a try
There was a problem hiding this comment.
e.g isnumeric we can get object-dtype result of bools and nans
There was a problem hiding this comment.
the wrapped result would be object in this case? This is for a object dtype array? for StringArray/ArrowString array the return type should always be boolean. object dtype accessors do cast their results, except extract, so if the result is all bools and no nans, the result dtype should be np.bool
There was a problem hiding this comment.
the result dtype should be np.bool
the result to be wrapped dtype should be np.bool
There was a problem hiding this comment.
these conversions are handled in _str_map in ObjectStringArrayMixin
|
|
||
| values = getattr(data, "values", data) # Series / Index | ||
| values = getattr(values, "categories", values) # categorical / normal | ||
| # TODO: avoid kludge for tests.extension.test_numpy |
There was a problem hiding this comment.
can revert to use the getattr pattern, either way is an anti-pattern
|
@simonjayhawkins was right, it was possible to remove the returns_bool keyword; green |
3 participants
Experimenting with #40489 I found that making Series inference behavior more like Index behavior broke a bunch of strings tests. This makes the strings code robust to that potential change by being more explicit about dtypes.