Python elegant assignment based on True/False values

Question

I have a variable I want to set depending on the values in three booleans. The most straight-forward way is an if statement followed by a series of elifs:

if a a         


        

Answer 1

if your goal is to avoid writing a lot of "ands" and boolean expressions you can use prime number and only one conditions like this (example for 2 conditions)

 cond = (2**cond_1)*(3**cond_2)

so

cond == 1 #means cond_1 and cond_2 are False
cond == 2 #means cond_1 is True and con_2 is False
cond == 3 #means cond_1 is False and con_2 is True
cond == 6 #means con_1 and Con_2 are True

This hack can be used for 3 conditions using 3 primes and so on

Like this...

cond = (2**a)*(3**b)*(5**c)
name = {30:'first', 6: 'second', 10:'third', 2:'fourth',
        15:'fifth', 3:'sixth', 5:'seventh', 1:'eighth'}[cond]