Python最快的方法来获取元素的数组

时间:2018-02-19 14:43:53

标签: python arrays

我正在寻找将元素放入数组的最快方法。假设我们有这样一个类:

class test:

    def __init__(self, a, b):
        self.let = a
        self.num = b

现在假设我们有一系列测试:

test1 = test("a", "1")
test2 = test("b", "2")
test3 = test("c", "3")
vec = [ test1, test2 , test3]

我希望结果是这样的:

newest = []
for t in vec:
   if(t.let == "a" or t.num == "3")
      newest.append(t)

有更好的方法吗?

2 个答案:

答案 0 :(得分:0)

这是一种方式:

class test:
    def __init__(self, let='', num=''):
        self.let = let
        self.num = num

test1 = test('a', '1')
test2 = test('b', '2')
test3 = test('c', '3')

vec = [test1, test2, test3]

newest = [i for i in vec if i.let == 'a' or i.num == '3']

newest_args = [(i.let, i.num) for i in newest]
# [('a', '1'), ('c', '3')]

答案 1 :(得分:0)

使用list comprehension。我还修改了您的示例,但由于另一个编辑处于待处理状态,因此无法更新问题。

class test:

    def __init__(self, a, b):
        self.let = a
        self.num = b

test1= test("a","1")
test2= test("b","2")
test3= test("c","3")

vec = [ test1, test2 , test3]

newest = [t for t in vec if( t.let == "a" or t.num == "3")]