python ternary operator with assignment

Question

I am new to python. I\'m trying to write this

if x not in d:
    d[x] = {}
q = d[x]

in a more compact way using the ternary operator

Answer 1

In Python, assignments cannot occur in expressions, therefore you can't write code like a = (b = c).

You're looking for setdefault:

q = d.setdefault(x, {})

Alternative, use a defaultdict.