python - 有效地将来自 json 对象的字符串附加到一个条件上？

Question

所以我有一个 json 对象数组，如下所示:

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，我现在正在使用一个 for 循环，如下所示:

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" 

但这会花费很多时间，因为我有大量的对象和长字符串。有没有更快的方法来完成这种连接？

[编辑] 正在调查 lambda功能，这可能是要走的路吗？

Answer 1

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