Discussion on "The List Mutability Pitfall in Python"

Maria Charman · 2016-08-16T18:11:56.401Z

The other day, one of my friends asked me for help in debugging some Python code that she wrote. All she had to do was implement a triangle() function to make the following test pass. def test_triangle(): expected = [ ['a'], ['aw'...

Discussion on "The List Mutability Pitfall in Python" | Hashnode

Károly Kiripolszky

lllIII!!.:|||IIIlll||||!!....

Aug 19, 2016

given that s = "awesome" the function triangle() can be written as a simple expression:

[[s[:i+1]] for i in range(len(s))]

without the useless list allocation at the beginning, the problem mentioned in the post is eliminated

Shai Loantz

Aug 19, 2016

Pay attention that this code is good but it will not pass the test because every element in the list has to be a list. The following code should do the job: > [[s[:i+1]] for i in range(len(s))]

Károly Kiripolszky

lllIII!!.:|||IIIlll||||!!....

Aug 19, 2016

@shai_loantz good catch, I had a pair of brackets missing. edited my comment :)

Maria Charman

Java, JavaScript and Python. I enjoy coffee!

Aug 19, 2016

Agreed, and kudos for writing it in a "Pythonic" way; but the point of the problem, and hence this story, is not to have it implemented in the simplest way possible, but to make sure that the concept of mutability is well understood. Thanks for the reply, anyway! :)

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The List Mutability Pitfall in Python

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The List Mutability Pitfall in Python

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Informative and an excellent post certainly. I constantly study and comment certainly on training associated articles.Best Assignment Help UK

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