spyder crash itertools.combinations

Question

我有这个程序：

导入itertools导入随机

randomlist = []
for i in range(0,32):
    a = random.randint(1,30)
    randomlist.append(a)
    print(randomlist)

a = randomlist
all_combinations = []
min_num_of_funds = 4 
max_num_of_funds = 10
for i in range(0,len(a)+1):
    if i>=min_num_of_funds & i<=max_num_of_funds:
        comb = list(itertools.combinations(a,i))
        all_combinations.append(comb)

我得到以下错误

内核已死，正在重新启动

Restarting kernel... 


 Populating the interactive namespace from numpy and matplotlib

[SpyderKernelApp] WARNING | No such comm: 4b233da0a85511ebb62bacde48001122
[SpyderKernelApp] WARNING | No such comm: 48c21daea86b11ebb62bacde48001122
[SpyderKernelApp] WARNING | No such comm: 61748e76a86c11ebb62bacde48001122
[SpyderKernelApp] WARNING | No such comm: fd9fd78ca86d11ebb62bacde48001122


Kernel died, restarting

我的感觉是，问题的根源是列表‘a’可能相对较大。任何解决这个问题的建议都将不胜感激。

Answer 1

我认为您应该使用and而不是& (python中的按位and运算符)。

由于较大的i值仍将计算为True，因此内存不足

i = 100

i >= 4 & i <= 10
Out[33]: True

sys.getsizeof(list(itertools.combinations(list(range(32)), 10)))
Out[29]: 572759960 (~572 MB)

这已经在内存中了，但由于这个错误，你的程序正在计算更大的i值，这会导致Spyder耗尽内存。

建议如下(适用于我，而不会耗尽内存)：

randomlist = []
for i in range(0,32):
    a = random.randint(1,30)
    randomlist.append(a)
    print(randomlist)

a = randomlist
all_combinations = []
min_num_of_funds = 4 
max_num_of_funds = 10
for i in range(min_num_of_funds, max_num_of_funds+1):
    comb = list(itertools.combinations(a,i))
    all_combinations.append(comb)