Subset clear solution for Pangram by veky - python coding challenges

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Subset solution in Clear category for Pangram by veky

from string import ascii_lowercase as letters
check_pangram = lambda text: set(letters) <= set(text.lower())

Jan. 28, 2015

Comments:

mlb00 on March 23, 2015, 12:04 a.m.
Could you explain this code a little bit more? It returns True if the set of [a,z] is in the set of input text? Is it possible that the set of text.lower() could be greater than 26?? In what situation could you have set(text.lower()) > set(letters)? Thanks!

veky on March 23, 2015, 5:34 a.m.
<blockquote> Could you explain this code a little bit more? </blockquote> Of course. :-) <blockquote> It returns True if the set of [a,z] is in the set of input text? </blockquote> Imprecise, but kinda. It returns whether the set containing all the lowercase letters of English alphabet is a subset of a set of all characters in text lowercased. <blockquote> Is it possible that the set of text.lower() could be greater than 26?? </blockquote> Of course. For example, if text contains 10 different punctuation characters, and all the letters except z. :-) <blockquote> In what situation could you have set(text.lower()) > set(letters)? </blockquote> In almost all the examples that are tested, when the input text is a pangram. The terminology is "proper superset". <blockquote> Thanks! </blockquote> No problem. If you want to know more, just ask.

Czarinov on Aug. 1, 2015, 1:39 p.m.
This solution is literally a logic sentence (check if subset is in set) translated into code. I had the same idea, but it just didn't cross my mind that <pre class='brush: python'>a <= b </pre> exists (or even words subset). Instead I had to remove items from list(letters) until the list was empty :D... Watching other people's solution, it seems my logic capacity is very low :(

veky on Aug. 1, 2015, 11:48 p.m.
<blockquote> logic sentence ... translated into code </blockquote> Exactly. Python is so expressive that many times you can say exactly what you need, at the level of abstraction of the natural solution, not at some arbitrary abstraction level of "basic operations". But of course, for that to work, you have to really know the language. <blockquote> my logic capacity is very low :( </blockquote> Not logic. As you said, it was perfectly clear to you what the "logical" (natural) solution would be. You just didn't dare write it in Python. ;-)

Czarinov on Aug. 2, 2015, 8:34 a.m.
Yep, gotta up my game! lambda and batteries everywhere!

veky on Aug. 2, 2015, 4:29 p.m.
lambda is just one of the batteries. Very applicable here since functions are extremely simple and debugging is separated from code-reading, but still, not everything here should be a lambda. :-)

xiaozhan on Nov. 9, 2015, 2:40 a.m.
I know writing 'ab~~yz' in python code is a bad idea, but I can't find the solution.And I know you must have the solution.

veky on Nov. 9, 2015, 5:46 a.m.
<blockquote> I know writing ‘ab~~yz’ in python code is a bad idea, but I can’t find the solution. </blockquote> That's interesting... I thought everyone wanting to do it the right way will find the right way easily. Ok, here is a natural way to do it: <ul> <li>go to docs.python.org</li> <li>click in the quick search box</li> <li>enter abcdefghijklmnopqrstuvwxyz there</li> <li>click Go</li> <li>you get three results, one of them is "string - Common string operations"</li> <li>you click on that, and see your string highlighted as string.ascii_lowercase</li> </ul> Which step do you think is the problem? How did you go about finding the solution? I'm really interested. Probably the docs should be reorganized, if even such a simple thing cannot be accomplished easily.

veky on Nov. 9, 2015, 8:45 a.m.
I'm glad you gave me a +, but I'd really like you to answer the question. When you want to find a Python documentation for something, what do you do? If Python community gets greater insight in that process, there is a chance we'll make life easier for many users.

DeCooper on Oct. 1, 2017, 3:15 p.m.
Nice solution. I like how you optimise your import statement. Using sets also nice touch.

veky on Oct. 2, 2017, 6:56 p.m.
Yeah, optimizing for readability is a nice optimization. :-) And "every foo is in bar" suggests subset relation right away.

2010min0ru on Oct. 31, 2020, 12:02 p.m.
Ahh why i didn't guessed to use sets this time?!.. Great solution!

veky on Oct. 31, 2020, 12:26 p.m.
Because you don't think about these tasks for months? (+_+)

Strings Theory

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