Head, *body and tail. clear solution for Correct Sentence by Tinus_Trotyl - python coding challenges

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Head, *body and tail. solution in Clear category for Correct Sentence by Tinus_Trotyl

def correct_sentence(text):
    head, *body, tail = text
    return "".join([head.upper()] + body + [tail if tail == "." else tail + "."])

Nov. 16, 2017

Comments:

veky on Nov. 18, 2017, 6:01 a.m.
You can use * in the ''.join, too. <pre class='brush: python'>''.join([head.upper(), *body, tail if ...]) </pre>

Tinus_Trotyl on Nov. 18, 2017, 6:19 p.m.
Neat, I'll make another one. Or maybe not though . . . (see Stefan's below).

StefanPochmann on Nov. 18, 2017, 6:49 p.m.
For example `correct_sentence('I')` crashes ("I." is a perfectly fine sentence, and since a point of the mission is to correct a missing dot, `'I'` is a perfectly reasonable input). Btw, how about `tail.strip(".") + "."`?

Tinus_Trotyl on Nov. 18, 2017, 6:52 p.m.
<h1>$%&*^!!! , I'm afraid you're right :-)</h1> Let me check out, I was just working on it. I wanted to figure out if there is a way to perform <head, * body, tail = text> as an evaluation on the right side (of the "="), in a way that its result can be cast directly in the "join" parameter. Thanks anyway.

Tinus_Trotyl on Nov. 18, 2017, 7:08 p.m.
<tail.strip(".") + "."> is really something, like it :-) btw How do you make those little white code-blocks ?

StefanPochmann on Nov. 18, 2017, 7:33 p.m.
With backticks. Look up "markdown".

Tinus_Trotyl on Nov. 18, 2017, 7:37 p.m.
`thank you :)`

Denis_Skrynnikov on June 17, 2020, 8:14 a.m.
`thank you :)`

Lightras on June 7, 2018, 9:18 a.m.
oh my... this head/body/tail unpacking mechanism looks like a pure magic for me! Learnt something new, thanks

Tinus_Trotyl on June 10, 2018, 12:58 p.m.
Hi, you might also have a look (at our blog) here : <a href="https://py.checkio.org/blog/arrays-for-python/?utm_content=buffer91272&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer">Arrays for Python by Oduvan</a>.

Konrad_Zagozda on June 7, 2018, 1:31 p.m.
Sorry to ask but: what does mean "*" before a variable? How program know to get only 1 character from start and end of text? Please just explain this line to me: "head, *body, tail = text"

Konrad_Zagozda on June 7, 2018, 2:06 p.m.
k i found answer here if anybody is interested: <a href="https://stackoverflow.com/questions/6967632/unpacking-extended-unpacking-and-nested-extended-unpacking">https://stackoverflow.com/questions/6967632/unpacking-extended-unpacking-and-nested-extended-unpacking</a> <pre class='brush: python'>a, *b = 1,2,3,4,5 # a = 1, b = [2,3,4,5] *a, b = 1,2,3,4,5 # a = [1,2,3,4], b = 5 a, *b, c = 1,2,3,4,5 # a = 1, b = [2,3,4], c = 5 </pre>

Tinus_Trotyl on June 10, 2018, 1:38 p.m.
Thanks for explaining :-) And will do also with strings : <pre class='brush: python'>>>> head, *body, tail = 'Python!' >>> head, *body, tail ('P', 'y', 't', 'h', 'o', 'n', '!') >>> head, body, tail ('P', ['y', 't', 'h', 'o', 'n'], '!') >>> [head] + body + [tail] ['P', 'y', 't', 'h', 'o', 'n', '!'] >>> [head, *body, tail] ['P', 'y', 't', 'h', 'o', 'n', '!'] >>> ''.join([head, *body, tail]) 'Python!' </pre>

pragsmatic on June 11, 2018, 12:51 p.m.
such a fine and human readable solution...loved it. I never knew Python's such interesting side

Strings and Integers

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