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

You can also use Python's dictionary get() method

q = d.get(x, {})

Explanation:

The get() method returns the value for the specified key if key is in a dictionary.

The syntax of get() is:

dict.get(key[, value]) 

get() Parameters

The get() method takes maximum of two parameters:

key - key to be searched in the dictionary

value (optional) - Value to be returned if the key is not found. The default value is None.

Return Value from get()

The get() method returns:

• the value for the specified key if key is in dictionary.
• None if the key is not found and value is not specified.
• value if the key is not found and value is specified.

Another option is to use defaultdict

from collections import defaultdict

d = defaultdict(dict)
q = d[x]

>>> q
>>> {}