can't create rec file im2rec in python

[jasperDD]

i do as shown here #14164
import mxnet
test='C:/Users/Admin/Desktop/test.lst' # folder where must be my test.lst
DataSet='C:/Users/Admin/Downloads/mypic/' # folder with my pictures (20 pics)

then when i try
data_iter = mx.image.ImageIter(
batch_size=4,
data_shape=(3,816, 1232),
label_width=1,
path_imglist='test.lst',
path_root='DataSet')

for data in data_iter:
d = data.data[0]
break

here error
Traceback (most recent call last):
File "", line 1, in
NameError: name 'data_iter' is not defined

then
img =nd.transpose(d,(0,2,3,1))
print(img.shape)
io.imshow(img[0].asnumpy().astype(np.uint8))
io.show()

and the errors

img =nd.transpose(d,(0,2,3,1))
Traceback (most recent call last):
File "", line 1, in
NameError: name 'nd' is not defined
print(img.shape)
Traceback (most recent call last):
File "", line 1, in
NameError: name 'img' is not defined
io.imshow(img[0].asnumpy().astype(np.uint
Traceback (most recent call last):
File "", line 1, in
NameError: name 'io' is not defined
io.show()

when i try create step 2. make .rec file

train_iter = mx.image.ImageIter(
batch_size=32,
data_shape=(3, 816, 1232),
path_imgrec='data.rec',
path_imgidx='data.idx', #help shuffle performance
shuffle=True,
aug_list=[mx.image.HorizontalFlipAug(0.5)]
)

train_iter.reset()
for batch in train_iter:
x = batch.data[0]
break

img =nd.transpose(x,(0,2,3,1))
print(img.shape)
io.imshow(img[0].asnumpy().astype(np.uint8))
io.show()
i get the error

test='C:/Users/Admin/Desktop/test.rec'
Dataset='C:/Users/Admin/Downloads/mypic'

train_iter = mx.image.ImageIter(
... batch_size=32,
... data_shape=(3, 816, 1232),
... path_imgrec='data.rec',
... path_imgidx='data.idx', #help shuffle performance
... shuffle=True,
... aug_list=[mx.image.HorizontalFlipAug(0.5)]
... )
Traceback (most recent call last):
File "", line 1, in
NameError: name 'mx' is not defined

... train_iter.reset()
Traceback (most recent call last):
File "", line 2, in
NameError: name 'train_iter' is not defined

for batch in train_iter:
... x = batch.data[0]
... break
...
... img =nd.transpose(x,(0,2,3,1))
File "", line 5
img =nd.transpose(x,(0,2,3,1))
^
SyntaxError: invalid syntax
print(img.shape)
Traceback (most recent call last):
File "", line 1, in
NameError: name 'img' is not defined
io.imshow(img[0].asnumpy().astype(np.uint8))
Traceback (most recent call last):
File "", line 1, in
NameError: name 'io' is not defined
io.show()

How to fix these errors to create .lst and .rec file?

here example of one of my picture form mypic
https://github.com/apache/incubator-mxnet/blob/master/example/captcha/captcha_example.png

[frankfliu]

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