该代码是Python2还是Python3??为什么我两个都用了还是在报错?

```Python
(env) [root@localhost information-extraction]# python bin/p_classification/p_train.py --conf_path=./conf/IE_extraction.conf
Traceback (most recent call last):
File "bin/p_classification/p_train.py", line 28, in
import paddle
File "/mnt/information-extraction/env/lib64/python2.7/site-packages/paddle/__init__.py", line 25, in
import paddle.dataset
File "/mnt/information-extraction/env/lib64/python2.7/site-packages/paddle/dataset/__init__.py", line 25, in
import paddle.dataset.sentiment
File "/mnt/information-extraction/env/lib64/python2.7/site-packages/paddle/dataset/sentiment.py", line 29, in
import nltk
File "/mnt/information-extraction/env/lib/python2.7/site-packages/nltk/__init__.py", line 128, in
from nltk.collocations import *
File "/mnt/information-extraction/env/lib/python2.7/site-packages/nltk/collocations.py", line 35, in
from nltk.probability import FreqDist
File "/mnt/information-extraction/env/lib/python2.7/site-packages/nltk/probability.py", line 333
print("%*s" % (width, samples[i]), end=" ")
```

Reproduce the reported command, `python bin/p_classification/p_train.py --conf_path=./conf/IE_extraction.conf`, in the shown environment and inspect the Python 2.7 installation of Paddle and NLTK. Compare the interpreter and dependency versions involved; the issue is done when the supported environment and the cause of the import failure are clearly established.

Written by the indexing model from the issue text.