What data type is the value of python expression 4 + 0.5

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In the expression, 4 is an integer and 0.5 is a floating-point number, so the value type they add up is floating-point.

> type (40.5)

The resolution is as follows:

The result of Python's integer operation is still integer, and the result of floating-point operation is still floating-point number:

1 / 2 / 2 / 3 = > integer 3

1.0 / 2.0 float = > floating point 3.0

But the result of a mixed integer and floating-point operation becomes a floating-point number:

1 "2.0" = > floating point 3.0

Why distinguish between integer operations and floating-point operations?

This is because the result of integer operation is always accurate, while the result of floating point operation is not necessarily accurate, because no matter how large the computer memory is, it is impossible to accurately represent infinite cyclic decimals, for example, changing 0.1 to binary is an infinite cyclic decimal.

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