#Exercise 27: Logic In this lesson we will be learning the basics of python programming logic and committing them to memory.
##The Truth Terms In Python, there are a few terms to determine whether something is "True" or "False." Logic on a computer is all about seeing if some combination of these characters and some variables are true at a certain point in the program/execution. A few of those terms will be listed below.
- and
- or
- not
- != (not equal)
- == (equal)
- >= (greater-than-equal)
- <= (less-than-equal)
- True
- False
##The Truth Tables Here are a few applications of the truth terms, these are important to commit to memory.
| NOT | True? |
|---|---|
| not False | True |
| not True | False |
| OR | True? |
|---|---|
| True or True | True |
| True or False | True |
| False or True | True |
| False or False | False |
| AND | True? |
|---|---|
| True and True | True |
| True and False | False |
| False and True | False |
| False and False | False |
popularly referred to as NOR
| NOT OR | True? |
|---|---|
| not (True or True) | False |
| not (True or False) | False |
| not (False or True) | False |
| not (False or False) | True |
popularly referred to as NAND
| NOT AND | True? |
|---|---|
| not (True and True) | False |
| not (True and False) | True |
| not (False and True) | True |
| not (False and False) | True |
And two more charts dealing with equality:
| != | True? |
|---|---|
| 1 != 1 | False |
| 1 != 0 | True |
| 0 != 1 | True |
| 0 != 0 | False |
| == | True? |
|---|---|
| 1 == 1 | True |
| 1 == 0 | False |
| 0 == 1 | False |
| 0 == 0 | True |