如何在Python中修复“ TypeError：'int'对象不可迭代”错误

Question

运行代码时，我得到：        

TypeError: 'int' object is not iterable'

在行中的

：

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

我不明白出现此错误的原因。
变量clust_sum是numpy.ndarray
谢谢你。

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，您不能对其进行迭代

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

Answer 2

您只需要在迭代中放入“ clust_sum = 0”：

    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