Pandas DataFrame astype() Method

Example

Return a new DataFrame where the data type of all columns has been set to 'int64':

import pandas as pd

data = {
"Duration": [50, 40, 45],
"Pulse": [109, 117, 110],
"Calories": [409.1, 479.5, 340.8]
}

df = pd.DataFrame(data)

newdf = df.astype('int64')

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Definition and Usage

The astype() method returns a new DataFrame where the data types has been changed to the specified type.

You can cast the entire DataFrame to one specific data type, or you can use a Python Dictionary to specify a data type for each column, like this:

{
  'Duration': 'int64',
  'Pulse'   : 'float',
  'Calories': 'int64'
}

Syntax

dataframe.astype(dtype, copy, errors)

Parameters

The copy and errors parameters are keyword arguments.

Parameter	Value	Description
dtype	data type, or a dictionary with data types for each column: { 'Duration': 'int64', 'Pulse' : 'float', 'Calories': 'int64' }	Required. Specifies the data type
copy	True\|False	Optional. Default True. Specifies whether to return a copy (True), or to do the changes in the original DataFrame (False).
errors	'raise'\|'ignore'	Optional. Default 'raise'. Specifies whether to ignore errors or raise an exception on error.