38 lines
682 B
Python
38 lines
682 B
Python
#!/usr/bin/env python
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# -*- encoding: utf-8 -*-
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"""
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Topic: 四舍五入运算
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Desc :
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"""
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def round_num():
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print(round(1.23, 1))
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print(round(1.27, 1))
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print(round(-1.27, 1))
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print(round(1.25361,3))
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# 舍入数为负数
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a = 1627731
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print(round(a, -1))
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print(round(a, -2))
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print(round(a, -3))
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# 格式化输出
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x = 1.23456
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print(format(x, '0.2f'))
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print(format(x, '0.3f'))
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print('value is {:0.3f}'.format(x))
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# 不要自以为是的用round去修正一些精度问题
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a = 2.1
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b = 4.2
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c = a + b
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print(c)
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c = round(c, 2) # "Fix" result (???)
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print(c)
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if __name__ == '__main__':
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round_num()
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