python3 - No module named 'html5lib'

[Sergio Spina]

I'm running a python3 program that requires html5lib but I receive the error No 
module named 'html5lib'.

Here are two session of terminal:

    sam@pc ~ $ python
    Python 2.7.9 (default, Mar  1 2015, 12:57:24) 
    [GCC 4.9.2] on linux2
    >>> import html5lib
    >>> html5lib.__file__
    '/usr/local/lib/python2.7/dist-packages/html5lib/__init__.pyc'
    >>> quit()

    sam@pc ~ $ python3
    Python 3.4.2 (default, Oct  8 2014, 10:45:20) 
    [GCC 4.9.1] on linux
    >>> import html5lib
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    ImportError: No module named 'html5lib'

Where can be the problem?
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