如何加速雙嵌套列表中字符的字符串構造？

s = "" 
for x in list: 
    s += some_function(x)

到

slist = [some_function(elt) for elt in somelist] 
s = "".join(slist)

但是，這怎麼可能適用，如果你「的」被雙重嵌套？例如...

s = "" 
for x in list: 
    for y in x: 
     s += some_function(y)

2010-10-18 coffee

Tangental：注意，特別是在CPython中的較新版本，追加到一個字符串實際上是非常快，使用陣列連接不再是一個重大改進。（由於GC問題，這不會轉化爲Jython。） – 2010-10-18 02:08:32

''.join(func(c) for s in somelist for c in s)

2010-10-18 02:04:07

string_list = [] 
for x in list: 
    for y in x: 
     string_list.append(some_function(y)) 

the_string = ''.join(string_list)

2010-10-18 02:05:31 sdolan

回答