.translate(table) done with operator.methodcaller clear solution for Atbash Cipher by Phil15 - python coding challenges

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.translate(table) done with operator.methodcaller solution in Clear category for Atbash Cipher by Phil15

from string import ascii_lowercase as LOW, ascii_uppercase as UPP
from operator import methodcaller

atbash = methodcaller('translate', str.maketrans(LOW + UPP, LOW[::-1] + UPP[::-1]))

Dec. 1, 2021

Comments:

H0r4c3 on April 30, 2023, 1:26 p.m.
Interesting solution! Bookmarked! I learn a lot of things from it: <pre class='brush: python'>operator.methodcaller(name, /, *args, **kwargs) Return a callable object that calls the method name on its operand. Equivalent to: def methodcaller(name, /, *args, **kwargs): def caller(obj): return getattr(obj, name)(*args, **kwargs) return caller </pre>

BootzenKatzen on April 26, 2024, 2:24 p.m.
I think the use of maketrans() is very smart (I didn't know it existed until now) but I had a hard time wrapping my brain around methodcaller. I'm guessing it's like the walrus operator, where it creates a variable and establishes its value in one step, except for functions? Creating the translation table and assigning it to a function in one step rather than doing: <pre class='brush: python'>translation = str.maketrans(LOW + UPP, LOW[::-1] + UPP[::-1]) atbash = lambda x: x.translate(translation) </pre>

Phil15 on April 26, 2024, 7:58 p.m.
I like `maketrans` too. (Note it can accept a third argument for characters to discard. Not needed here.) Yes `methodcaller` is a function returning a function which can be surprising. It describes `atbash` as the `translate` method with some translation table. But we can do without easily just as you did with a `lambda` here. Sometimes, it's nice to be able to solve a mission without `def`/`lambda` ^^

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