在条件下将json对象的字符串有效地附加在一起吗? [英] Appending strings from json object on a condition together efficiently?

问题描述

所以我有一个数组的json对象，看起来像:

So I have an array of json objects that look like:

data = [{key1: 123, key2:"this is the first string to concatenate"},
 {key1: 131, key2:"this is the second string to concatenate"},
 {key1: 152, key2:"this is the third string to concatenate"} ] 

基本上，我现在正在使用for循环，如下所示:

basically, I am using a for loop right now as follows:

all_key2 = ""
data = json.load(json_file)
for p in data: 
    #make it all one big string 
    if langid.classify(p["key2"])=="english": 
        all_key2 = p["key2"] + " " + all_key2 

所以答案应该是:

"this is the first string to concatenate this is the second string to concatenate this is the third string to concatenate" 

但这要花很多时间，因为我有不计其数的对象和长字符串.有没有一种更快的方法来实现这种融合?

But this is taking a lot of time because I have a bajillion objects and long strings. Is there a faster way to accomplish this concatentation?

正在调查 lambda 函数，这可能是要走的路吗?

Was looking into lambda functions, might that be the way to go?

推荐答案

all_key2 = " ".join([elem["key2"] for elem in data if langid.classify(elem["key2"])=="english"])

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