ImportError:No module named Numpy

[HninHnin]

Python 3.5.3 (v3.5.3:1880cb95a742, Jan 16 2017, 15:51:26) [MSC v.1900 32 bit (Intel)] on win32
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>>> import nltk
>>> sentence="I am a teacher"
>>> tokens = nltk.word_tokenize(sentence)
>>> tokens
['I', 'am', 'a', 'teacher']
>>> tagged = nltk.pos_tag(tokens)
Traceback (most recent call last):
File "<pyshell#4>", line 1, in <module>
tagged = nltk.pos_tag(tokens)
File "C:\Users\Hnin Hnin\AppData\Local\Programs\Python\Python35-32\Lib\site-packages\nltk\tag\__init__.py", line 103, in pos_tag
tagger = load(_POS_TAGGER)
File "C:\Users\Hnin Hnin\AppData\Local\Programs\Python\Python35-32\Lib\site-packages\nltk\data.py", line 786, in load
resource_val = pickle.load(opened_resource)
ImportError: No module named 'numpy'