如何在同时包含数字和字符串的列表中添加数字

Question

假设我有一个列表如下：

ExampleList = [2,4,7,4,2,"randomword",23,42,2,1,4,-53,"newrandomword",32,5,2,3]

我怎么把数字加起来

Answer 1

您可以使用以下生成器表达式，它将在列表中添加所有ints：

l = [2,4,7,4,2,"randomword",23,42,2,1,4,-53,"newrandomword",32,5,2,3]

sum(i for i in l if isinstance(i,int))
# 80

Answer 2

也可以使用函数filter()：

l = [2,4,7,4,2,"randomword",23,42,2,1,4,-53,"newrandomword",32,5,2,3]

sum(filter(lambda x: isinstance(x, int), l))
# 80

Answer 3

这将处理所有数字：）

>>> import numbers
>>> x
[2, 4, 7, 4, 2, 'randomword', 23, 42, 2, 1, 4, -53, 'newrandomword', 32, 5, 2, 3, 1.02]
>>> sum(y for y in x if isinstance(y, numbers.Number))
81.02