所以round(0.5)会近似到1,而round(-0.5)会近似到-1。 但是到了python3.5的doc中,文档变成了 " values are rounded to the closest multiple of 10 to the power minus ndigits; if two multiples are equally close, rounding is done toward the even choice." 如果距离两边一样远,会保留到偶数的一边。
"values are rounded to the closest multiple of 10 to the power minus ndigits; if two multiples are equally close, rounding is done toward the even choice." 如果距离两边一样远,会保留到偶数的一边。比如round(0.5)和round(-0.5)都会保留到0,而round(1.5)会保留到2。 Python 2.7 中的结果如下: ...
在python2.7的doc中,round()的最后写着,"Values are rounded to the closest multiple of 10 to the power minus ndigits; if two multiples are equally close, rounding is done away from 0." 保留值将保留到离上一位更近的一端(四舍六入),如果距离两端一样远,则保留到离0远的一边。所以round(0.5)...
round()不是简单的四舍五入的处理方式。 For the built-in types supporting round(), values are rounded to the closest multiple of 10 to the power minus ndigits; if two multiples are equally close, rounding is done toward the even choice (so, for example, both round(0.5) and round(-0.5)...
the built-in types supporting round(), values are rounded to the closest multiple of 10 to the power minus ndigits; if two multiples are equally close, rounding is done toward the even choice (so, for example, both round(0.5) and round(-0.5) are 0, and round(1...
在python2.7的doc中,round()的最后写着,"Values are rounded to the closest multiple of 10 to the power minus ndigits; if two multiples are equally close, rounding is done away from 0." 保留值将保留到离上一位更近的一端(四舍六入),如果距离两端一样远,则保留到离0远的一边。所以round(0.5)...
>>>print(round(1.2345,3))1.234>>>print(round(1.23456,3))1.235>>>print(round(2.5))2>>>print(round(3.5))4 但round函数有坑,在Python3.5的文档中:“values are rounded to the closest multiple of 10 to the power minus ndigits; if two multiples are equally close, rounding is done toward th...
ax = fig.add_subplot(1,1,1)ax.set_xlabel("Sulphates")ax.set_ylabel("Frequency")ax.text(1.2,800,r'$\mu$='+str(round(wines['sulphates'].mean(),2)),fontsize=12)freq, bins, patches = ax.hist(wines['sulphates'], color='steelblue...
所以round(0.5)会近似到1,而round(-0.5)会近似到-1。 但是到了python3.5的doc中,文档变成了“values are rounded to the closest multiple of 10 to the power minus ndigits; if two multiples are equally close, rounding is done toward the even choice.” 如果距离两边一样远,会保留到偶数的一边。
round函数很简单,对浮点数进行近似取值,保留几位小数。比如 >>> round(10.0/3, 2) 3.33 >>> round(20/7) 3第一个参数是一个浮点数,第二个参数是保留的小数位数,可选,如果不写的话默认保留到整数。 这么简单的函数,能有什么坑呢? 1、round的结果跟python版本有关 ...