Python

>>> df.astype({'col1': 'int32'}).dtypes
col1    int32
col2    int64
dtype: object

df.astype(int)

df = pd.read_csv("weather.tsv", sep="	",  
                 dtype={'Day': str,'Wind':int64})
df.dtypes

# select columns that need to be converted
cols = df.select_dtypes(include=['float64']).columns.to_list()
df = df.astype({col:int for col in cols})

convert pandas datatype

df['current_anniversary_date'] = df['current_anniversary_date'].astype('datetime64[ns]')

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