2-liner: reduce creative solution for Beat The Previous by przemyslaw.daniel - python coding challenges

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2-liner: reduce solution in Creative category for Beat The Previous by przemyslaw.daniel

cmb = lambda a, b: (a[0]+[int(a[1]+b)], "") if not a[0] or a[0][-1] < int(a[1]+b) else (a[0], a[1]+b)
beat_previous = lambda d: __import__("functools").reduce(cmb, d, [[], ""])[0]

Aug. 11, 2023

Comments:

StefanPochmann on March 23, 2024, 11:13 p.m.
Another 2-liner :-P ```python beat_previous=lambda D,p=-1,c=0:[[p:=c] [c:=0]for d in D if(c:=c*10+int(d))>p] ```

przemyslaw.daniel on March 24, 2024, 6:10 p.m.
you mean <pre class='brush: python'>beat_previous=lambda D,p=-1,c=0:[[p:=c,c:=0][c>0]for d in D if(c:=c*10+int(d))>p] </pre>

StefanPochmann on March 24, 2024, 6:39 p.m.
Hmm, no. If you want it on one line, then just remove the line break. Why change the short and pretty `[p:=c][c:=0]` to `[p:=c,c:=0][c>0]`?

przemyslaw.daniel on March 24, 2024, 6:56 p.m.
it doesn't work with my python version 3.9 that's why I automatically corrected it. It seems to be right with latest one

StefanPochmann on March 24, 2024, 7:07 p.m.
Interesting. I don't see why it wouldn't work in 3.9. Do you get a syntax error?

StefanPochmann on March 24, 2024, 7:11 p.m.
Ah, <a href="https://docs.python.org/3/whatsnew/3.10.html">new in Python 3.10</a>: <blockquote> Assignment expressions can now be used unparenthesized within set literals and set comprehensions, as well as in sequence indexes (but not slices). </blockquote> So the simple fix for older Python is `[p:=c][(c:=0)]`.

przemyslaw.daniel on March 24, 2024, 7:12 p.m.
<pre class='brush: python'> File "C:\Users\apd002c\PycharmProjects\pythonProject\main.py", line 2 beat_previous=lambda D,p=-1,c=0:[[p:=c][c:=0]for d in D if(c:=c*10+int(d))>p] ^ SyntaxError: invalid syntax </pre>

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