2+2

4

17.35*1.15

19.9525

5-25

-20

2/85

0.023529411764705882

2-3*5+7

-6

.-'° abstraction °'-. carefully controlled ignorance!

2+

  File "/tmp/ipykernel_4232/4209523232.py", line 1
    2+
      ^
SyntaxError: invalid syntax

(2+a)*(2+3)

---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
/tmp/ipykernel_4232/2537614536.py in <module>
----> 1 (2+a)*(2+3)

NameError: name 'a' is not defined

(5+5)*(8- )

  File "/tmp/ipykernel_4232/3128942883.py", line 1
    (5+5)*(8- )
              ^
SyntaxError: invalid syntax