Python 3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 16:52:21) 
[Clang 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license()" for more information.
>>> fsum(5)
Traceback (most recent call last):
  File "<pyshell#0>", line 1, in <module>
    fsum(5)
NameError: name 'fsum' is not defined
>>> 
========== RESTART: /Users/koc/Desktop/fun1.py ==========
>>> fsum(5)
55
>>> 
========== RESTART: /Users/koc/Desktop/fun1.py ==========
>>> fsum(5)
55
>>> gsum(5)
225
>>> gsum(500)
15687562500
>>> 
========== RESTART: /Users/koc/Desktop/fun1.py ==========
>>> fsum(5)
55
>>> xsum(5)
55
>>> fsum(5)
55
>>> f = fsum(5)
>>> f
55
>>> x = xsum(5)
55
>>> x
>>> fsum(5)**2
3025
>>> xsum(5)**2
55
Traceback (most recent call last):
  File "<pyshell#13>", line 1, in <module>
    xsum(5)**2
TypeError: unsupported operand type(s) for ** or pow(): 'NoneType' and 'int'
>>> 
========== RESTART: /Users/koc/Desktop/fun1.py ==========
>>> hsum(4)
Traceback (most recent call last):
  File "<pyshell#14>", line 1, in <module>
    hsum(4)
TypeError: hsum() missing 1 required positional argument: 'm'
>>> hsum(4,7)
748
>>> 4**3 + 5**3 + 6**3 + 7**3
748
>>> gsum(10)
3025
>>> hsum(1,10)
3025
>>> 
========== RESTART: /Users/koc/Desktop/fun1.py ==========
>>> hw(100,200)
391299250
>>>