Explore variable naming in Python prompts

variable_naming_prompts.md

Find out if each of the following is either an acceptable or not acceptable Python identifier.

Do this by trying to assign them as an identifier for a variable. If you get a SyntaxError: can't assign to operator, fix the error by changing the identifier.

- sumTotal 
- sumtotal
- sum-total 
- sum total
- sum_total
- sum
- 2x
- -4
- $16
- U$O
- 10%
- if
- while 
- Private 
- public
- _static 
- _4
- _
- ___ 
- maçã_da_beira_alta
- ಠ_ಠ
- λ
- 🐶
```