什么是减法函数类似sum()用于减去列表中的项目? [英] What is a subtraction function that is similar to sum() for subtracting items in list?
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问题描述
我试图创建一个计算器,但我无法编写一个会从列表中减去数字的函数。
例如:
class Calculator(object):
def __init __(self,args):
self.args = args
def subtract_numbers(self ,* args):
return ***这里是我需要的减法函数****
另外,我可以简单地使用return sum(args)
来计算总数,但我不确定我可以为减法做些什么。
解决方案
从functools导入reduce Python Python 2中的省略
导入运算符
a = [1,2,3,4]
xsum = reduce(operator .__ add__,a)#or operator.add
xdif = reduce(operator .__ sub__,a )#或operator.sub
print(xsum,xdif)
## 10 -8
reduce(operator.xxx,list)
基本上插入操作符列表元素。
I am trying to create a calculator, but I am having trouble writing a function that will subtract numbers from a list.
For example:
class Calculator(object):
def __init__(self, args):
self.args = args
def subtract_numbers(self, *args):
return ***here is where I need the subtraction function to be****
For addition, I can simply use return sum(args)
to calculate the total but I am unsure of what I can do for subtractions.
解决方案
from functools import reduce # omit on Python 2
import operator
a = [1,2,3,4]
xsum = reduce(operator.__add__, a) # or operator.add
xdif = reduce(operator.__sub__, a) # or operator.sub
print(xsum, xdif)
## 10 -8
reduce(operator.xxx, list)
basically "inserts" the operator in-between list elements.
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