4-liner: set concept clear solution for The Ship Teams by Stensen - python coding challenges

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4-liner: set concept solution in Clear category for The Ship Teams by Stensen

def two_teams(s):
    return [
        sorted(set(s.keys()).difference(b:={i for i in s if s[i] if 20 <= s[i] <= 40})),
        sorted(b)
        ]

Nov. 4, 2020

Comments:

tarjeii on Dec. 29, 2020, 8 a.m.
Nice, Could you please tell me how the := operator works, or where I can find any info? Is it necessary with the extra 'if s[i]'

Stensen on Dec. 29, 2020, 11:09 a.m.
Hi dude, ":=" is called the walrus operator, it is used to assign and return the value at the same time. So when say for example: ```if a:= 6: return a``` , You are assigning 6 to a & at the same time 6 is checked in the conditional if, so as to return whether 6 is True or False, and then return the variable a. So an alternative code would look like: <pre class='brush: python'>a = 6 if a: return a </pre> And that's why we created this operator to avoid redundancy of variable, But, Be careful using it, it is very tricky, and it may confuse your logic of code, just use it when it is necessary and avoid whenever there is some other efficient alternatives.

Stensen on Dec. 29, 2020, 11:12 a.m.
Here at <a href="https://www.geeksforgeeks.org/walrus-operator-in-python-3-8/">GeeksforGeeks</a> they have gone through it details, Good luck.

Escher

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