Simple syntax error in Python if else dict comprehension

Question

I have a set and dictionary and a value = 5

v = s = {\'a\', \'b\', \'c\'}
d = {\'b\':5 //<--new value}

If the key \'b\' in dictionary d

Answer 1

You can't use a ternary if expression for a name:value pair, because a name:value pair isn't a value.

You can use an if expression for the value or key separately, which seems to be exactly what you want here:

{k: (d[k] if k in v else 0) for k in v}

However, this is kind of silly. You're doing for k in v, so every k is in v by definition. Maybe you wanted this:

{k: (d[k] if k in v else 0) for k in d}