下面是我用过的一个例子:

def volume(self):
    return round(pi * self.radius ** 2 * self.height, 2)

def surface_area(self):
    return round((2 * pi * self.radius * self.height) + (2 * pi * self.radius ** 2), 2)

因为你想要你的答案在十进制数字，所以你不需要类型转换你的答案变量str在printC()函数。

然后使用printf风格的字符串格式

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

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

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

您可以使用四舍五入运算符最多为2小数

num = round(343.5544, 2)
print(num) // output is 343.55

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