Python invert operator - visualizing the negative number -

in simple words, definition given ~n -n - 1.

for example ~1

 1 = 0001 ~1 = 1110 (which -2)  

for numbers

say ~2

 2 = 0010 ~2 = 1101 (which representation of -3 in twos complement) 

but question is

1110 = -2 can visualized -2 (the right 2 bits 10 , rest 1) 1101 = -3 can't visualized (going above logic should -5) 

so wondering there simple way see , tell twos complement binary negative number represents without doing calculations .

~n = -n - 1 equivalent -n = ~n + 1. means figure out negative of number is, can invert (in head) , add one. pretend zeros ones , vice versa, add one.

example: pretend this

1101 

is this

0010 

then add 1

0011 

thus, 1101 represents -3.