Stop Pandas from converting int to float

Question

I have a DataFrame. Two relevant columns are the following: one is a column of int and another is a column of str.

I understa

Answer 1

If you use DataFrame.append to add the data, the dtypes are preserved, and you do not have to recast or rely on object:

In [157]: df
Out[157]:
   int   str
0    0  zero

In [159]: df.append(pd.DataFrame([[1, None]], columns=['int', 'str']), ignore_index=True)
Out[159]:
   int   str
0    0  zero
1    1  None