# xarray.core.accessor_str.StringAccessor.istitle

#### StringAccessor.istitle()[[source]](https://github.com/pydata/xarray/blob/main/xarray/core/accessor_str.py#L1034-L1064)

Check whether all characters in each string are titlecase.

* **Returns:**
  **istitle** ([array](https://numpy.org/doc/stable/glossary.html#term-array) of [`bool`](https://docs.python.org/3/builtins/functions.html#bool)) – Array of boolean values with the same shape as the original array.

### Examples

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```pycon
>>> da = xr.DataArray(
...     [
...         "The Evolution Of Species",
...         "The Theory of relativity",
...         "the quantum mechanics of atoms",
...     ],
...     dims="title",
... )
>>> da
<xarray.DataArray (title: 3)> Size: 360B
array(['The Evolution Of Species', 'The Theory of relativity',
       'the quantum mechanics of atoms'], dtype='<U30')
Dimensions without coordinates: title
>>> istitle = da.str.istitle()
>>> istitle
<xarray.DataArray (title: 3)> Size: 3B
array([ True, False, False])
Dimensions without coordinates: title
```

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