如何用Python四舍五入到2个小数?

我在这段代码的输出中得到了很多小数(华氏到摄氏度转换器)。

我的代码目前看起来是这样的:

def main():
    printC(formeln(typeHere()))

def typeHere():
    global Fahrenheit
    try:
        Fahrenheit = int(raw_input("Hi! Enter Fahrenheit value, and get it in Celsius!\n"))
    except ValueError:
        print "\nYour insertion was not a digit!"
        print "We've put your Fahrenheit value to 50!"
        Fahrenheit = 50
    return Fahrenheit

def formeln(c):
    Celsius = (Fahrenheit - 32.00) * 5.00/9.00
    return Celsius

def printC(answer):
    answer = str(answer)
    print "\nYour Celsius value is " + answer + " C.\n"



main()

我的问题是，如何让程序把每个答案四舍五入到小数点后2位?

当前回答

可以使用round函数，它的第一个参数是数字，第二个参数是小数点后的精度。

在你的情况下，它将是:

answer = str(round(answer, 2))

2013-12-08 18:20:41

其他回答

float(str(round(answer, 2)))
float(str(round(0.0556781255, 2)))

2017-03-14 01:32:21

可以使用python“%”的字符串格式化操作符。 “%。“2f”表示小数点后2位。

def typeHere():
    try:
        Fahrenheit = int(raw_input("Hi! Enter Fahrenheit value, and get it in Celsius!\n"))
    except ValueError:
        print "\nYour insertion was not a digit!"
        print "We've put your Fahrenheit value to 50!"
        Fahrenheit = 50
    return Fahrenheit

def formeln(Fahrenheit):
    Celsius = (Fahrenheit - 32.0) * 5.0/9.0
    return Celsius

def printC(answer):
    print "\nYour Celsius value is %.2f C.\n" % answer

def main():
    printC(formeln(typeHere()))

main()

http://docs.python.org/2/library/stdtypes.html#string-formatting

2013-12-08 18:16:28

round(12.3956 - 0.005, 2)  # minus 0.005, then round.

答案来自:https://stackoverflow.com/a/29651462/8025086

2018-05-23 07:34:12

from decimal import Decimal, ROUND_HALF_UP

# Here are all your options for rounding:
# This one offers the most out of the box control
# ROUND_05UP       ROUND_DOWN       ROUND_HALF_DOWN  ROUND_HALF_UP
# ROUND_CEILING    ROUND_FLOOR      ROUND_HALF_EVEN  ROUND_UP

our_value = Decimal(16.0/7)
output = Decimal(our_value.quantize(Decimal('.01'), 
rounding=ROUND_HALF_UP))
print output

2021-08-29 18:19:39

简单的例子

比尔= 10.24 打印(圆(10.241))

2022-07-30 06:44:42

如何用Python四舍五入到2个小数?

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