这个冒号是什么意思? [英] What does this colon mean?

问题描述

我使用 tensorflow 学习了深度学习.

I learning about deep learning using tensorflow.

在github上研究代码时，我看到了一个未知的:.

While studying the code on github I saw an unknown :.

我进行了各种搜索，但是错误出现在以下部分中，并且我无法解决该错误.

I searched variously, but the error appeared in the following section, and I could not solve the error.

我不知道此错误是不是不返回浮点数的问题还是:问题.

I don't know if this error is a problem that doesn't return a float or that : problem.

   return self.test_images_name[(batch_num % ro_num) * batch_size: (batch_num % ro_num + 1) * batch_size], \
               self.test_eye_pos_name[(batch_num % ro_num) * batch_size: (batch_num % ro_num + 1) * batch_size], \
               self.test_ref_images_name[(batch_num % ro_num) * batch_size: (batch_num % ro_num + 1) * batch_size], \
               self.test_ref_pos_name[(batch_num % ro_num) * batch_size: (batch_num % ro_num + 1) * batch_size]

错误消息

文件 "C:\ Users \ admin \ Desktop \ Exemplar-GAN-Eye-Inpainting-Tensorflow-master \ Exemplar-GAN-Eye-Inpainting-Tensorflow-master \ ExemplarGAN.py"，第154行，在火车上 train_data_list，batch_eye_pos，batch_train_ex_list，batch_ex_eye_pos = self.data_ob.getNextBatch(step2，self.batch_size) TypeError:"NoneType"对象不可迭代

File "C:\Users\admin\Desktop\Exemplar-GAN-Eye-Inpainting-Tensorflow-master\Exemplar-GAN-Eye-Inpainting-Tensorflow-master\ExemplarGAN.py", line 154, in train train_data_list, batch_eye_pos, batch_train_ex_list, batch_ex_eye_pos = self.data_ob.getNextBatch(step2, self.batch_size) TypeError: 'NoneType' object is not iterable

推荐答案

这是 slice运算符应用于列表时，由于长名称以及冒号后面有空格，因此看起来很奇怪.如果您简化一点，那就是:

It's the slice operator being applied to the lists, it just looks odd because of the long names, and because there's a space after the colon. If you simplify a bit, it's just:

i = (batch_num % ro_num) * batch_size
j = (batch_num % ro_num + 1) * batch_size

return self.test_images_name[i:j], \
       self.test_eye_pos_name[i:j], \
       self.test_ref_images_name[i:j], \
       self.test_ref_pos_name[i:j]

显然，其中之一是无"，因此您无法对其进行索引或切片.

Apparently, one of these is None, so you can't index or slice it.

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