TypeError: get() takes no keyword arguments

問題描述

《機器學習實戰》kNN算法中，

    for i in range(k):
        vote_label = distances_sorted_index[i]
        count[labels[vote_label]] = count.get(labels[vote_label], default=0) + 1

出現報錯

Traceback (most recent call last):
  File "E:/workplace/python/code/test1.py", line 29, in <module>
    classify0(test_data, group, labels, k)
  File "E:/workplace/python/code/test1.py", line 20, in classify0
    count[labels[vote_label]] = count.get(labels[vote_label], default=0) + 1
TypeError: get() takes no keyword arguments

解決

count[labels[vote_label]] = count.get(labels[vote_label], 0) + 1

default並不是內置參數，文檔中的參數只是作爲參考，要按位置給參

參考

https://www.e-learn.cn/content/wangluowenzhang/152733