如何避免 python 四舍五入？

Question

我对 python 和整体来说真的很陌生。因此，我将这段代码作为一些实践的一部分进行编写，该实践涉及制作一个转换器，当代码为运行通过 PowerShell 时，该转换器可以将重量和身高的输入值分别从千克转换为磅，将英寸转换为英尺。

第一段代码的输出四舍五入，我想知道为什么？另外，如何避免这种情况。

但是，对于第二段代码，输出没有四舍五入。为什么？

    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，您指定了 %d 以仅从结果中提取整数部分。在第二个代码中没有特定的数据类型，所以它打印出准确的答案。

Answer 2

@ayhan 说的对，显示的时候四舍五入了，因为你用的是%d。请参阅文档 here。如果你想显示一个浮点数，你可以使用 %f:

print 'test: %f', 3.43

但是通常首选使用 str.format

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

如何避免 python 四舍五入？

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powershell-2.0

python-2.7