Hi Everybody...
I'm SH4Y4N From Ashiyane Digital Security Team....
I found the Bug "Function Summons" From Python 2.7...
When You Try To  Summons some Function It's Regular...
But What Happend When You're Calling two Function Simultaneous?
Your 2 Functions Run But the thing is that It contain some Error...
That's Strange To Run Some Code Within Some Traceback Error....
I Could Take You SOme Tips To Prevent this Action...
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def Ashiyane():
  print 'Ashiyane Digital Security Team'

def Shayan():
  print "Bug Hunter For Ever"

print Shayan()+Ashiyane()

Show :
Bug Hunter For Ever
Ashiyane Digital Security Team

Traceback (most recent call last):
  File "<pyshell#11>", line 1, in <module>
    k()+h()
TypeError: unsupported operand type(s) for +: 'NoneType' and 'NoneType'
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You See The result....
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Special Tnx To : Angel--D3m0n , C4T , MR.CICILI

I have to tell you, I almost closed this as spam due to the spamish prose styling of the text.

Please read the python tutorial, or email the python-tutors list if you want to learn more about why your code produced the results it did.