If you don’t know if there’s a key value in dict, you’d better use it

dict.get(key)
If you read with dict[key] it will report a KeyError exception,

Dict. Get method mainly provides a function to return the default value if the value of corresponding key is not obtained.

And dict[key] actually calls the method with ___
D.get(key[, d]) -> D[K] if K in D, else D. defaults to None