如何使用循環填充Python字典

Question

我試圖在遍歷時填充此字典，但是當我將其打印以進行檢查時，似乎僅添加到字典中的唯一元素是for循環中的最后一項。 如何才能做到這一點？

probabilities = {}
with tf_Session(graph=graph) as sess:
results = sess.run(output_operation.outputs[0],
                  {input_operation.outputs[0]:t})
results = np.squeeze(results)

top_k = results.argsort()[-5:][::-1]
labels = load_labels(label_files)
for j in top_k:
    print(labels[j], results[j])
    probabilities = {labels[j]:results[j]}

print (probabilities)

Answer 1

這不是將元素添加到dict的正確語法。 您只是每次都重置dict 。 你可能想要

probabilities[labels[j]] = results[j]

代替

probabilities = {labels[j]:results[j]}

Answer 2

您將在每次迭代中在此處創建一個新的字典，

probabilities = {labels[j]:results[j]}

這應該是

probabilities[labels[j]] = results[j]

Answer 3

這是因為您要在循環的每次迭代中創建一個新的字典。 請嘗試以下操作：

probabilities = {}
for j in top_k:
   print(labels[j], results[j])
   probabilities[labels[j]] = results[j]