Python uses the format method to retain three decimal places

# The format method is a built-in Python string formatting method.

The basic syntax is: str.format(), which enhances the string formatting function.

The basic syntax is to use {} and : to replace the previous %.

The format function can receive multiple parameters, and the positions do not need to be in order.

Specific examples are as follows:

>>> print("{:.0f}".format(3.1415926))
3
>>> print("{:.2f}".format(3.1415926))
3.14
>>> print("{:.3f}".format(3.1415926))
3.142

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