.astype()

The .astype() function in NumPy allows changing the data type of the elements in an array. It is beneficial for tasks such as converting floating-point numbers to integers or changing integers to strings, ensuring that the data is in the desired format.

Syntax

ndarray.astype(dtype, order='K', casting='unsafe', subok=True, copy=True)

to clipboard
Copy to clipboard

• dtype: The desired data type for the array elements.
• order: Specifies the memory layout order. It can take the following values:
  • C: C-style (row-major) order.
  • F: Fortran-style (column-major) order.
  • A: When specified, NumPy prioritizes Fortran-style order (F) if all arrays are Fortran-contiguous. Otherwise, it defaults to an order of C.
  • K: This is the default value. It keeps the order of the input array.
• casting: Specifies how casting should be handled if the desired data type is different from the current data type. It can take the following values:
  • no: The data type will not be cast.
  • equiv: Allows only byte-order changes.
  • safe: Prevents data loss during conversion.
  • same_kind: Allow safe conversions within similar types.
  • unsafe: This is the default value. It allows any conversion, even if data loss happens.
• subok: If True (default), subclasses of the array will be preserved. If False, the result will always be a base-class array.
• copy: If True (default), a copy of the array is made. If False, the input array is reused if possible.

Example

The following example shows the use of the .astype() function to convert the elements of an array from floating-point data type to integer data type:

import numpy as np

arr = np.array([1.2, 3.4, 5.6])

arr_int = arr.astype(int)

print(arr_int)

to clipboard
Copy to clipboard

The code above generates the following output:

[1 3 5]

to clipboard
Copy to clipboard

Codebyte Example

The following codebyte example demonstrates the use of the .astype() function:

us
Visit us
code
Hide code
Code
Output
Hide output
Hide output
Loading...
Copy Codebyte
Copy to your clipboard
Run