如何修复 Python 中的“TypeError: 'int' object is not iterable”错误

Question

当我运行我的代码时，我得到：

TypeError: 'int' object is not iterable'

在线：

centroids[key] = [m / len(assignments[key]) for m in clust_sum]

这是我的python代码：

def k_means_clust(data,num_clust,num_iter,w=5):
    centroids=random.sample(data,num_clust)
    counter=0
    for n in range(num_iter):
        counter+=1
        print counter
        assignments={}
        #assign data points to clusters
        for ind,i in enumerate(data):
            min_dist=float('inf')
            closest_clust=None
            for c_ind,j in enumerate(centroids):
                if LB_Keogh(i,j,5)<min_dist:
                    cur_dist=DTWDistance(i,j,w)
                    if cur_dist<min_dist:
                        min_dist=cur_dist
                        closest_clust=c_ind
            if closest_clust in assignments:
                assignments[closest_clust].append(ind)
            else:
                assignments[closest_clust]=[]

        #recalculate centroids of clusters
        for key in assignments:
            clust_sum=0
            for k in assignments[key]:
                clust_sum=clust_sum+data[k]
            centroids[key]=[m/len(assignments[key]) for m in clust_sum] #<-HERE ERROR 

    return centroids

我无法理解我收到此错误的原因。
变量clust_sum是一个numpy.ndarray
先感谢您。

Answer 1

您在循环之前重新定义了 clust_sum

clust_sum=0

所以 clust_sum 现在是一个 int，你不能迭代它

centroids[key]=[m/len(assignments[key]) for m in clust_sum]

Answer 2

您只需要将“clust_sum=0”排除在迭代之外：

    clust_sum=0
    #recalculate centroids of clusters
    for key in assignments:
        for k in assignments[key]:
            clust_sum=clust_sum+data[k]
        centroids[key]=[m/len(assignments[key]) for m in clust_sum]

return centroids