[复杂的四舍五入] 例如对大数在十位、百位上四舍五入 #number

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[复杂的四舍五入] 例如对大数在十位、百位上四舍五入 #number

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Last edited Jan 31, 2019

Created on Jan 31, 2019

This example demonstrates a visual note on Python’s built-in `round` function, showing both standard decimal rounding and rounding to larger place values (tens, hundreds, thousands). The code first illustrates that `round` follows banker’s rounding at the .5 boundary, where 1.5 and 2.5 both yield 2, and then showcases negative `ndigits` arguments to round an integer like 1627731 down to 1627730, 1627700, or up to 1628000. The source is a Python script (likely run in an interactive shell) that uses only the standard library’s `round` API, with no external data or plotting library involved.

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