2017-02-26 164 views
1

我是新来的python,我试图找出如何访问和使用存储在元组对(a,b)列表中的整数,这样我可以将b除以b,如果满足条件,则将元组追加到新列表中,然后对元组进行计数。我只想使用基本函数和for循环来做到这一点。访问/使用元组列表中的元素python 3.x

我借了另一个计算器的问题一些代码,我用来创建的元组大小不同的两个独立的整数列出清单,例如:

list_a = list(range(10, 51)) 

list_b = list(range(1, 21)) 

new_tuple_list = [] 
new_tuple_count = 0 

for i, a in enumerate(list_a): 
    new_tuple_list.append((a, list_b[i % len(list_b)])) 
    divisors_count += 1 

print ("New tuple count: ", new_tuple_count) 
print (new_tuple_list) 

这给了我: 新的元组数:41

[(10, 1), (11, 2), (12, 3), (13, 4), (14, 5), (15, 6), (16, 7), (17, 8), (18, 9), (19, 10), (20, 11), (21, 12), (22, 13), (23, 14), (24, 15), (25, 16), (26, 17), (27, 18), (28, 19), (29, 20), (30, 1), (31, 2), (32, 3), (33, 4), (34, 5), (35, 6), (36, 7), (37, 8), (38, 9), (39, 10), (40, 11), (41, 12), (42, 13), (43, 14), (44, 15), (45, 16), (46, 17), (47, 18), (48, 19), (49, 20), (50, 1)] 

但我想知道如果我从(10,1),11乘以2等中除以10,我会得到一个整数,如果是的话,我想将它添加到一个新列表并计算这些元组对的数量。 我已经试过这样:

tuple_test = [(10,1), (11,2)] 
def find_divisors (x): 

    NUM_tuples = [] 
    tuples_count = 0 

    for x[0] in pairs: 
     for x[1] in pairs: 
      if x[0]/x[1] % 2 == 0: 
       NUM_tuples.append(pairs) 
       tuples_count += 1 
       return (x[0]/x[1] % 2) 
    return NUM_tuples 
    return tuples_count 

find_divisors(tuple_test) 

我也尝试过这样的事情:

def divisors(list_a, list_b): 

    test_int = 0 
    new_divisors = [] 

    for a in list_a: 
     for b in list_b: 
      if a/b % 2 == 0: 
       test_int += 1 
       new_divisors += (a,b) 

    return new_divisors 
    return test_int 

    NUM_tuples = [] 
    tuples_count = 0 


    for i, c in enumerate(list_a): 
     NUM_tuples.append((c, list_b[i % len(list_b)])) 
     tuples_count += 1 
    return tuples_count 
    return NUM_tuples 

divisors(list_a, list_b) 

任何帮助,将不胜感激!

+1

使用'list(zip(list_a,list_b))'来组合列表。这是更基本的方式。 –

+2

请仔细检查您的缩进。正如你所写的,看起来你已经在连续的行上写了两个'return'语句,例如,然后继续这个函数。如果这实际上是您编写的代码,那么您需要查看教程。 – jonrsharpe

+0

@MadPhysicist'zip'在他的情况下不起作用,因为zip将停止在'(29,20)',因为他的list_b只有20个值。但是如果你检查他的结果,那么用'(30,1)'继续,等等。 – abccd

回答

3

尝试以下操作:

a = range(1,20) 
b = range(1,5) 
c = [(x,y) for x in a for y in b if x%y==0] 
print(c) 

它提供了以下输出

[(1, 1), (2, 1), (2, 2), (3, 1), (3, 3), (4, 1), (4, 2), (4, 4), (5, 1), (6, 1), (6, 2), (6, 3), (7, 1), (8, 1), (8, 2), (8, 4), (9, 1), (9, 3), (10, 1), (10, 2), (11, 1), (12, 1), (12, 2), (12, 3), (12, 4), (13, 1), (14, 1), (14, 2), (15, 1), (15, 3), (16, 1), (16, 2), (16, 4), (17, 1), (18, 1), (18, 2), (18, 3), (19, 1)] 

您可以轻松地适应这个为你的节目,我觉得!

PS:上面的长度为c会给你元组数。

+0

这是太棒了,简单优雅!谢谢! – virgiliocyte

+0

如果有帮助,请接受答案。谢谢。 – Ujjwal

0

我还想补充说,你可以使用itertools.cycle来减少你的代码以获取元组的原始列表。

from itertools import cycle 

# a and b don't have to be a list unless you need them as a list elsewhere. 
a = range(10, 51) 
b = range(1, 21) 
# cycle the shorter one 
tuple_lst = list(zip(a, cycle(b))) 

print("New tuple count:", len(tuple_lst)) 
print(tuple_lst)