In [1]: import xndframes as xf

In [2]: import pandas as pd

In [3]: s = ["Hello", "World", None]

In [4]: sa = xf.XndframesArray(s)

In [5]: sa.data
Out[5]: xnd(['Hello', 'World', None], type='3 * ?string')

In [6]: sa
Out[6]: <xndframes.base.XndframesArray at 0x7f836bb349b0>

In [7]: ser = pd.Series(sa)

In [8]: ser
Out[8]:
0    Hello
1    World
2     None
dtype: xndframes[3 * ?string]

In [9]: df = pd.DataFrame({'strings': sa})

In [10]: df
Out[10]:
  strings
0   Hello
1   World
2    None

In [11]: df.info()
<class 'pandas.core.frame.DataFrame'>
RangeIndex: 3 entries, 0 to 2
Data columns (total 1 columns):
strings    2 non-null xndframes[3 * ?string]
dtypes: xndframes[3 * ?string](1)
memory usage: 104.0 bytes

In [12]: df.isna()
Out[12]:
   strings
0    False
1    False
2     True