
In [1]: x = pd.Series([1, 'X'])

In [2]: x.astype(str)
Out[2]: 
0    1
1    X
dtype: object

In [3]: x.astype(str).iloc[0]
Out[3]: '1'

In [4]: x.astype(str).iloc[1]
Out[4]: 'X'

In [5]: x.iloc[0]
Out[5]: 1

In [6]: x.iloc[1]
Out[6]: 'X'
