Python dictionary creation syntax

Question

I'm wondering if there's any way to populate a dictionary such that you have multiple keys mapping to the same value that's less verbose than say:

d = {1:'yes', 2:'yes', 3:'yes', 4:'no'} 

I'm thinking something along the lines of:

d = {*(1,2,3):'yes', 4:'no'} 

which is obviously a syntax error.

Is there a reasonably simple method of doing this without TOO much obfuscation? (I'm not playing code golf, but I also don't need to write essentially the same thing over and over. However, any code-golf related answers would be appreciated as well since code-golf is awesome =]).

Edit:

I probably picked a bad example. This is what I'm trying to do:

d = {*('READY', 95): 'GPLR2_95', 'CHARGING': 'GPLR3_99', 'PROTECTION': 'GPLR3_100', 'CONNECTED': 'GPLR3_101', 'ERROR':'GPLR3_102'} 

What I would expect this to expand to is:

d = {'READY':'GPLR2_95', 95: 'GPLR2_95', ...} 

Edit->Edit:

I know this is stupid and totally unnecessary, but my goal is to make this declaration on a single line. This obviously shouldn't limit any responses and writing code just because it fits on 1 line is stupid. But I'm writing a module level constant dict that would be nice if it was a single liner.

Answer 1

You could turn it around:

>>> d1 = {"yes": [1,2,3], "no": [4]} 

and then "invert" that dictionary:

>>> d2 = {value:key for key in d1 for value in d1[key]} >>> d2 {1: 'yes', 2: 'yes', 3: 'yes', 4: 'no'}