Question

我对python＆amp;总体。所以我写这段代码作为一些实践的一部分，涉及制作一个转换器，当代码通过PowerShell运行时，转换器可以将重量和高度的输入值分别从kg转换为lbs和英寸到英尺。

使用第一段代码，输出结果四舍五入，我想知道为什么？此外，如何避免这种情况。

但是，使用第二段代码时，输出不会四舍五入。为什么呢？

    print "This is my personal converter."
height = int(raw_input("what is your height in inches? "))
weight = int(raw_input("what is your wieght in kilograms? "))
kg_to_lbs_rate = 2.20462
inches_to_feet_rate = 0.0833333

print "Since your height in inches is equal to %d, then your height in feet should equal to %d" % (height, height * inches_to_feet_rate),"feet"
print "Since your weight in kilograms is equal to  %d, then your weight in lbs should equal to %d" % (weight, weight * kg_to_lbs_rate),"lbs"

    print "This is my personal converter."
height = int(raw_input("what is your height in inches? "))
weight = int(raw_input("what is your wieght in kilograms? "))
kg_to_lbs_rate = 2.20462
inches_to_feet_rate = 0.0833333

print "Since your height in inches is equal to %d, then your height in feet should equal to " % height, height * inches_to_feet_rate,"feet"
print "Since your weight in kilograms is equal to  %d, then your weight in lbs should equal to" % weight, weight * kg_to_lbs_rate,"lbs"

Here's the output of both the codes when run in PowerShell

Answer 1

在第一个代码中，你指定％d从结果中仅提取整数部分。在第二个代码中没有特定的数据类型，因此它打印出准确的答案。

Answer 2

@ayhan是正确的，当您使用%d时，它会在您显示时四舍五入。请参阅文档here。如果要显示浮动，可以使用%f：

print 'test: %f', 3.43

然而，通常首选使用str.format

print 'test: {}'.format(3.43)

如何避免python四舍五入？

2 个答案: