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<>python求和函数sum()详解
<>今天在学习的过程中，误用sum()函数，我又去查了查python sum()函数才恍然大悟。
我本来想算几个Int值相加的和，本以为很简单的事情，结果却很悲伤，例：
>>>sum = sum(1,2,3) #结果很明显出现问题报错 TypeError: sum expected at most 2 arguments,
got 3
傻乎乎的我以为只能算前两个数的和等于3，就又试了一下
>>>sum = sum(1,2) #结果还是报错 TypeError: 'int' object is not iterable
其实，我们所了解sum()函数语法是这样的
sum(iterable[, start])
其中
*
iterable – 可迭代对象，如：列表(list)、元组(tuple)、集合(set)、字典(dictionary)。
*
start – 指定相加的参数，如果没有设置这个值，默认为0。
也就是说sum()最后求得的值 = 可迭代对象里面的数加起来的总和(字典:key值相加) + start的值(如果没写start的值，则默认为0)
所以，我所求的几个int值的和可以写成这样
>>>sum = sum([1,2,3]) # in list 6
如果我们加上start的话，应该是这样的
>>> sum = sum([1,2,3],5) #in list +start 11 >>> sum = sum((1,2,3)) #in tuple 6
>>> sum = sum({1,2,3}) #in set 6 >>> sum = sum({1:5,2:6,3:7}) #in dictionary key
6 >>> sum = sum(range(1,4)) #in range() 6
学习这些过后，我们就可以正确的运用sum()函数了。
别指望着看一遍就能记住和整掌握什么 – 请看第二遍，第三遍。
