你如何根据数据类型在python中设置条件? [英] How do you set a conditional in python based on datatypes?

问题描述

这个问题看似简单，但我想不通.我知道您可以在 python 中检查数据类型，但是如何根据数据类型设置条件?例如，如果我必须编写一个对字典/列表进行排序并将所有整数相加的代码，我如何隔离搜索以仅查找整数?

This question seems mind-boggling simple, yet I can't figure it out. I know you can check datatypes in python, but how can you set a conditional based on the datatype? For instance, if I have to write a code that sorts through a dictionary/list and adds up all the integers, how do I isolate the search to look for only integers?

我想一个简单的例子看起来像这样:

I guess a quick example would look something like this:

y = []
for x in somelist:
    if type(x) == <type 'int'>:  ### <--- psuedo-code line
    y.append(x)
print sum(int(z) for z in y)

那么对于第 3 行，我将如何设置这样的条件?

So for line 3, how would I set such a conditional?

推荐答案

怎么样，

if isinstance(x, int):

但更简洁的方法就是

sum(z for z in y if isinstance(z, int))

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