'''
integer
1,100,-8080,0
0xff00,0xa5b4c3a2
float
1.23,3.14,-9.01
1.23x109 => 1.23e9
string
'abc'
"xyz"
'I'm "OK"!' => I'm "OK"!
'''
'''I'm "OK"!'''
'''
bool
True False
and or not
null value
None
variable
[a-zA-Z][1-9]_ (cant begin with digital)
constant
use uppercase
'''