Python 3.7.0 (v3.7.0:1bf9cc5093, Jun 27 2018, 04:06:47) [MSC v.1914 32 bit (Intel)] on win32
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>>> 2 + 2
4
>>> 50-5*6
20
>>> (50-5*6)/4
5.0
>>> 8/5
1.6
>>> 17/3
5.666666666666667
>>> 17//3
5
>>> 17%3
2
>>> 5*3+2
17
>>> 5**2
25
>>> 2**7
128
>>> width=20
>>> height=5*9
>>> width*height
900
>>> n
Traceback (most recent call last):
  File "<pyshell#13>", line 1, in <module>
    n
NameError: name 'n' is not defined
>>> 4*3.75-1
14.0
>>> tax = 12.5/100
>>> price = 100.50
>>> price*tax
12.5625
>>> price + _
113.0625
>>> round(_, 2)
113.06
>>> 
