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10. $ python
Python 2.7.3 (default, Apr 10 2013, 05:46:21)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for
more information.
>>>

11. >>> print 'Hello, World!'
Hello, World!
>>>
>>> print 'Welcome to PYSEC101 Course'
Welcome to PYSEC101 Course
>>>
>>> 'Hello World'
'Hello World'
>>> 3
3
>>>

12. >>> 12 / 7
1
>>>
>>> 12.0 / 7
1.7142857142857142
>>>
>>> float(12) / 7
1.7142857142857142
>>>

13. >>> 3 + 2 * 4
11
>>> ( 3 + 2 ) * 4
20
>>>
>>> _
20
>>>

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15. $ vim Hello.py
print 'Hello, World!'
~
~
~
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$ python Hello.py
Hello, World!