CODEWITHSUNDEEP
pythondictionarycoding-stylerefactoring
Dekoderer Dekoderer
Dekoderer Dekoderer

Reputation: 171

How to reduce number of python code?

How to reduce number of code when element does not already exist in dictionary? Otherwise assign it to the object. Prove of python concept:

class MyClass:
    pass

key = "test python"
item = MyClass()
d = {}
if d.get(key) is None:
    d[key] = item
else:
    item = d[key]
print(item)

Is it possible to remove if else statement?

Upvotes: 0

Views: 123

Answers (4)

Keating Smith
Keating Smith

Reputation: 36

You can read python documentation -> setdefault: 

class MyClass:
    pass

key = 'test python'
item = MyClass()
d = {}
item = d.setdefault(key, item)

It`s more pythonic!!!!

Upvotes: 1

Will
Will

Reputation: 193

Maybe see if using defaultdict (from collections) would help?

I'm not sure exactly what you're trying to do, but I think this is the same behavior?

from collections import defaultdict

class MyClass:
    pass

key = "test python"
item = MyClass()
d = defaultdict()
d[key] = item
print(item)

Unrelated, with the above, I think

if not key in d:

or

if not d.get(key):

might be a little more pythonic?

Upvotes: 1

Eugene Primako
Eugene Primako

Reputation: 2817

You can use dict.setdefault for this:

key = "test python"
item = MyClass()
d = {}
print(d.setdefault(key, item))

Upvotes: 1

user3187878
user3187878

Reputation:

Read up on Documentation before you start asking questions...

You want to use this setdefault(key[, default])

Upvotes: 1

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