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Showing content from http://docs.scipy.org/doc/numpy-1.11.0/reference/generated/numpy.promote_types.html below:

numpy.promote_types — NumPy v1.11 Manual

Returns the data type with the smallest size and smallest scalar kind to which both type1 and type2 may be safely cast. The returned data type is always in native byte order.

This function is symmetric and associative.

type1 : dtype or dtype specifier

First data type.

type2 : dtype or dtype specifier

Second data type.

out : dtype

The promoted data type.

Notes

New in version 1.6.0.

Starting in NumPy 1.9, promote_types function now returns a valid string length when given an integer or float dtype as one argument and a string dtype as another argument. Previously it always returned the input string dtype, even if it wasn’t long enough to store the max integer/float value converted to a string.

Examples

>>> np.promote_types('f4', 'f8')
dtype('float64')

>>> np.promote_types('i8', 'f4')
dtype('float64')

>>> np.promote_types('>i8', '<c8')
dtype('complex128')

>>> np.promote_types('i4', 'S8')
dtype('S11')

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