How to use 'pandas cast column to int' in Python

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107def _time_cols_to_ints(df, columns=None, nat_value=SMALLDT64):
108 """
109 Converts all datetime columns to ints.
111 Previously NaT were convertible to ints, but now they raise a value error.
112 We need, therefore, to designate a time that will be used as NaT.
113 """
114 cols = columns or df.select_dtypes(include=["datetime64"]).columns
115 df.loc[:, cols] = df.loc[:, cols].fillna(nat_value).astype(np.int64)
116 return df

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